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Full History of published / announced KTeV Results

from E799-II (rare decays) and E832 (epsilon'/epsilon)

E799-II

• K_L->pi0ee (updated July 21, 2004)
• K_L->pi0 mu mu (updated Jun. 3, 2000)
• K_L->pi0nu nu-bar (updated Apr. 5,1999)
• K_L->pi+pi-e+e- (updated March 18, 2006)
• K_L->pi0 pi0 e+e- (updated on Nov. 28, 2001)
• K_L->pi0pi0mu+mu- (updated on June 9, 2009)
• K_L->pi0 pi0 gamma (updated on September 18, 2008)
• K_L->e+e-e+e- (updated June 20, 2003)
• K_L->e+e-mu+mu- (updated April 9, 2003)
• K_L-> e+e- gamma (updated August 9, 2007)
• K_L->e+e- gamma gamma (updated July 3, 2001)
• K_L->mu+ mu- gamma (updated August 24, 2001)
• K_L->mu+ mu- gamma gamma (updated Oct. 31, 2000)
• Ke3
• K_L->pi+e-nu e+e- (updated August 29, 2007)
• K_L->pi0e+e-gamma (updated April 28, 2008)
• K_L->pi⁺pi^-pi⁰gamma (updated June 25, 2005)
• K_L->pi⁺pi^-pi⁰e⁺e^- (updated June 25, 2005)
• K_L->pi0 mu e (updated Apr. 19, 2008)
• K_L->pi0 pi0 mu e (updated Apr. 19, 2008)
• pi0->ee (updated January 22, 2007)
• pi0->e+e-gamma (updated November 3, 2006)
• pi0->e+e-e+e- (updated May 8,2008)
• pi0->mu e (updated Apr. 19, 2008)
• Cascade beta decay (updated April 19, 2001)
• Cascade0 form factors (updated Sep. 28, 2001)
• Cascade muonic beta decay (updated January 26, 2006)
• Cascade0->Sigma0 gamma (updated February 16, 2001)
• Cascade0->Lambda gamma
• Cascade0->Lambda pi0
• Cascade0 and Anti-Cascade0 polarizations (updated Feb. 7, 2007)
• H dibaryon (updated Mar. 13, 2000)

[Top]

E832

• epsilon'/epsilon (updated Feb. 25, 2008)
• delta m, tau_S, Phi_+-, delta Phi (CPT test) (updated Feb. 25, 2008)
• K_L-> pi e nu Charge asymmetry (updated May 12, 2004)
• K_L->pi+ pi- gamma (updated August 28, 2006)
• K_L->pi0 gamma gamma (updated August 18, 2008)
• Ke3 radiative decay (updated Nov. 13, 2001)
• K_L->pi⁰pi⁰pi⁰ Dalitz Plot (updated August 18, 2008)
• K_L->pi+ pi- pi0 gamma (updated Jan. 18, 2002)
• |V_us| (updated Nov. 10, 2004)
• K_L Branching Fractions (updated Dec. 11, 2004)
• Kl3 Form Factors (updated Nov. 21, 2006)
• Kl3 radiative decays (updated Jan. 14, 2005)
• K* (updated Jul. 27, 2002)
• R0: Light Gluino(updated Sep. 16, 1999)

KTeV E799-II results

[Top] [E832]

K_L ->pi⁰ e⁺ e^-

• [Plots]
• BR < 3.5 x 10^-10 (90%CL),
  based on 1 event observed (expected background is 0.99 +- 0.35 events) in 1999 data.
  Combining with the previous result based on 1997 data, the combined limit is
  BR < 2.8 x 10^-10 (90%CL) .
  Published in Phys. Rev. Lett. 93, 021805 (2004).
  [Plots] Accepted by PRL (May 13, 2004),
  Submitted to PRL (Sep. 18, 2003).
  Announced by Patty McBride at Moriond Electroweak 2003, March 19, 2003.
  Detailed description of the analysis is available in Nancy Jin-Jin Lai's PhD thesis.
• BR < 5.1 x 10^-10 (90%CL)
  Published in Phys. Rev. Lett. 86, 397-401 (2001).
  PRL abstract, [Plots]
  Accepted by PRL (11/14/00), Submitted to PRL (9/11/00)
• BR <5.64 x 10^-10 (90%CL, preliminary).
  Presented by Taku Yamanaka at XXXIVth Rencontres de Moriond, March 13-20, 1999.
  More comprehensive talk given by Leo Bellanto at Fermilab Wine and Cheese Seminar, April 30, 1999.
  Full description of one of the 1997 data analyses is available in PhD thesis by Peter Mikelson.

K_L ->pi⁰ mu⁺ mu^-

• [Plots]
• BR < 3.8 x 10^-10 (90% CL), based on 2 observed events with an expected background of 0.87 +- 0.15 background events.
  Published in Phys. Rev. Lett. 84, 5279-5282 (2000).
  PRL abstract, [Plots]
  Submitted to PRL (1/5/00).
• BR <3.4 x 10^-10 (90% CL, preliminary).
  Presented by Leo Bellanto at Fermilab Wine and Cheese Seminar, April 30, 1999.
  Original analysis of this result is available in PhD thesis by Masayoshi Sadamoto.

K_L ->pi⁰ nu nu-bar

• [Plots]
• BR <5.9 x 10^-7 (90% CL), using pi⁰->e⁺ e^- gamma.
  Published in Phys. Rev. D 61, 072006 (2000).
  PRD abstract, [Plots]
  Full description is available in PhD thesis by Kazunori Hanagaki.
  Full presentation by Kazunori Hanagaki at Fermilab Wine and Cheese, 8/21/98.
  Presented by Taku Yamanaka at Workshop on CP Violation, Adelaide, 7/3-8/98.
  
• BR <1.6 x 10^-6 (90% CL), using pi⁰->gamma gamma.
  Published in Phys. Lett. 447, 240 (1999).
  PLB Abstract, [Plots]

K_L ->pi⁺ pi^- e⁺ e^-

• [Plots]
• BR = (3.63 +- 0.11 +- 0.14) x 10^-7 (preliminary) based on 1507.8+-46.0 events after background subtraction in full data sample. This new result uses new gM1=1.35, instead of 0.76 which have been being used for previous measurements.
  Presented by Katsumi Senyo at EPS HEP99 on July 14, 1999.
  Full description is available in PhD thesis by Katsumi Senyo.
• BR = (3.32 +- 0.14 +- 0.28) x 10^-7 (preliminary) based on 631 events in winter data set.
  Presented by Tony Barker at ICHEP98
• BR = (3.2 +- 0.6 +- 0.4) x 10^-7 based on 46 candidates in 1 day data.
  Published in Phys. Rev. Lett. 80, 4123 (1998).
  PRL abstract, [Plots].
  First announced by Vivian O'Dell at MIST97.
• Asymmetry = 13.6 +- 1.4 +- 1.5 %
  g_CR (coupling of the CP conserving charge radius process) = 0.163 +- 0.014 +- 0.023
  <r²_K0> (K⁰ charge radius) = (-0.077 +- 0.007 +- 0.011 ) fm²
  |g_E1|/|g_M1| < 0.04 (90% CL)
  |g~_M1| = 1.11 +- 0.12 +- 0.08
  a₁/a₂ = (-0.744 +- 0.027 +- 0.032) GeV²/c²
  Published in Phys. Rev. Lett. 96, 101801 (2006).
  Accepted for publication by Phys. Rev. Lett. (February 21, 2006).
  Submitted to Phys. Rev. Lett. (August 4, 2005).
  PRL abstract, hep-ex/0508010 [Plots]
  Full description is available in PhD thesis by Alexander Golossanov.
• Asymmetry = 13.7 +- 1.4 +- 1.5%,
  g_m1 = 1.11 +- 0.12 +- 0.07
  a₁/a₂ = -0.744 +- 0.022 +- 0.032
  |g_E1|/|g_M1| < 0.04 (90% CL)
  |g_CR| = 0.163 +- 0.017 +- 0.023
  K₀ charge radius = -0.077 +- 0.014 fm²
  (ALL PRELIMINARY).
  Presented by Sasha Ledovskoy at Moriond EW 2004.
  Full description is available in PhD thesis by Alexander Golossanov.
• Asymmetry = (13.3 +- 1.4 +- 1.0)% (preliminary),
  a1/a2 = -0.75 +- 0.03 +- 0.02 (preliminary),
  gM1 = 1.10 +- 0.10 +- 0.06 (preliminary),
  based 5056 events in 1997 + 1999 combined data after subtracting 185 background events. Note that the systematic errors on A, a1/a2 and gM1 do not include the effect of g_CR (charge radius).
  Presented by Alexander Golossanov at DPF2002. [Plots]
• Asymmetry = (13.6 +- 2.5 +- 1.2)%,
  a1/a2 = -0.720 +- 0.028 +- 0.009 GeV²/c²,
  |gM1| = 1.35 +0.20-0.17 +- 0.04
  Published in Phys. Rev. Lett. 84, 408 (2000).
  PRL abstract [Plots].
  Submitted to Phys. Rev. Lett.(Aug. 2, 1999). Presented by Sasha Ledvskoy at KAON99.
  Full description of an independent analysis is available in PhD thesis by Katsumi Senyo.
• Asymmetry = (14.6 +- 2.3 +- 1.1)% (preliminary), using entire data set. a1/a2 = -0.705 is used.
  Presented by John Belz at DPF99.
• Asymmetry = (13.5 +- 2.5 +- 3.0)% (preliminary), using old a1/a2 = -1.8.
  HQ98.
• a1/a2 = -0.705 +0.01 -0.02 (stat only), and gM1 = 1.44 +0.12 -0.19 (stat only) (preliminary)
  Presented by John Belz at DPF99.
  Full description of an independent analysis is available in PhD thesis by Katsumi Senyo.
• K⁰ RMS charge radius, <R²(K⁰)> = -0.47 +- 0.008 (stat) +- 0.006 (syst) [fm²].
  Presented by Mike Arenton at BCP4 (2001).

K_L->pi⁰pi⁰e⁺e^-

• [Plots]
• BR < 6.6 x 10^-9 (90% CL), based on 1 observed event where 0.3 background events are expected.
  Published in Phys. Rev. Lett. 89, 211801 (2002).
  PRL abstract, [Plots]
• BR < 5.4 x 10^-9 (90% CL) (Preliminary), based on 1 observed event where 0.3 background events are expected.
  Submitted to PRL (Dec. 2001)
• BR < 5.4 x 10^-9 (90% CL) (preliminary), based on 1 observed event where 0.4+0.4-0.3 background events are expected.
  Presented by Mike Arenton at BCP4 (2001).

K_L->pi⁰pi⁰mu⁺mu^-

• BR(K_L->pi⁰pi⁰mu⁺mu^-) < 8.60 x 10^-11 (90% CL)
  BR(K_L->pi⁰pi⁰X⁰ -> pi⁰pi⁰mu⁺mu^-) < 9.41 x 10^-11 (90% CL) (PRELIMINARY)
  based on 0 signal events.
  Presented by David Phillips at Moriond EW 2009, March 11, 2009.
  Detailed description is available in PhD thesis by David Phillips.

K_L->pi⁰pi⁰gamma

• BR < 2.32 x 10^-7 (90% CL)
  
  based on 1 observed event in 1997+1999 data.
  Submitted to Phys. Rev. Lett. (Aug. 21, 2007).
  Accepted for publication in Phys. Rev. D (July 17, 2008).
  Published in Phys. Rev. D 78, 032014 (2008).
  [Plots]
• BR < 2.52 x 10^-7 (90% CL) (preliminary) based on no observed events.
  Presented by **********

K_L ->e⁺ e^- e⁺ e^-

• [Plots]
• BR = (4.16 +- 0.13 +- 0.13 +- 0.17 (ext syst)) x 10^-8 (preliminary) based on 1056 events in 1997 and 1999 data.
  Form factor, alpha_K* = -0.03 +- 0.13 +- 0.04 (preliminary).
  Presented by Tony Barker at Fermilab Wine and Cheese, June 20, 2003.
  Detailed description is available in Jason LaDue's PhD thesis.
• BR = (4.07 +- 0.12(stat) +- 0.11(sys) +- 0.16(norm)) x 10^-8 (preliminary) based on 1056 events with 5 background events in 1997 and 1999 data.
  Announced by Patty McBride at Moriond Electroweak 2003, March 19, 2003.
  
• BR = (3.72 +- 0.18 +- 0.23) x 10^-8,
  beta_CP = -0.23 +- 0.09 +- 0.02,
  gamma_CP = -0.09 +- 0.09 +- 0.02,
  alpha_K*^eff(BMS) = -0.14 +- 0.16 +- 0.15,
  alpha_DIP^eff = -1.1 +- 0.6 (stat),
  based on 441 candidate events with a background of 4.2 events, where the distribution of the angle between ee and ee planes, phi, was fit to dGamma / dphi \propto 1 + beta_CP cos(2 phi) + gamma_CP sin(2 phi).
  Published in Phys. Rev. Lett. 86, 5425-5429 (2001).
  PRL abstract, [Plots]
  Accepted by Phys. Rev. Lett. (4/12/01). Submitted to Phys. Rev. Lett. (2/5/01). A full description is available in PhD thesis by Eva Halkiadakis.
• BR = (3.77 +- 0.18 +- 0.27) x 10^-8 (preliminary) based on 432.5 events.
  Presented by Yau W. Wah at ICHEP2000.
• BR = (4.14 +- 0.27 +- 0.31) x 10^-8 (preliminary) based on 242 events.
  Presented by Tony Barker at ICHEP98.
• beta = -0.212 +- 0.091 +- 0.02,
  gamma = -0.119 +- 0.085 +- 0.02,
  where dGamma/d phi = 1 + beta * cos(2 phi) + gamma * sin(2 phi),
  Alpha_K* = 0.03 +- 0.17 +- 0.18 (all preliminary),
  based on 432.5 events.
  Presented by Yau W. Wah at ICHEP2000.
• alpha (cos 2(ee-ee) dependence) = -0.22 +- 0.11 (preliminary).
  Presented by Tony Barker at ICHEP98.
• Mass peak and ee-ee angle distributions for 391 events were shown by Amit Lath at DPF99.

K_L ->e⁺ e^- mu⁺ mu^-

• [Plots]
• BR=(2.69 +- 0.24 +- 0.12) x 10^-9 ((M_eemm/M_K)² > 0.95 ) ,
  based on 132 events.
  Form factor alpha_DIP = -1.59 +- 0.37.
  BR(lepton flavor violation) < 4.12 x 10^-11 .
  Published in Phys. Rev. Lett. 90, 141801 (2003).
  PRL abstract, [Plots]
  Presented by Patty McBride at Moriond EW 2003.
• BR = (2.61 +- 0.23 +- 0.18) x 10^-9 (preliminary),
  based on 133 events (including 0.8 background events) in 1997+1999 combined data.
  BR(wrong sign lepton flavor violation) <4.12 x 10^-11 (90% CL) (preliminary),
  based on 0 events observed in 1997+1999 combined data.
  Both results were presented by Jason Hamm at DPF2002. [plots]
  Detailed description is available in PhD thesis by Jason Hamm.
• [The next result has been superseded by the above result.]
  BR = (2.62 +- 0.40 +- 0.17) x 10^-9,
  based on 43 events (including 0.24 background events) in 1997 data.
  BR(wrong sign) < 1.23 x 10^-10 (90% CL).
  Published in Phys. Rev. Lett. 87, 111802 (2001).
  PRL abstract [Plots]
• BR = (2.50 +- 0.41 +- 0.15) x 10^-9 (preliminary),
  based on 38 events (including 0.18 background events).
  Presented by Yau W. Wah at ICHEP2000.
• BR(wrong sign) < 1.36 x 10^-10 (90% CL, preliminary).
  Presented by Yau W. Wah at ICHEP2000.
• 38 events were observed, and Meeuu, Mee, Muu distributions were shown by Amit Lath at DPF99.

K_L->e⁺e^-gamma

• [Plots]
• BR = (9.25 +- 0.03 +- 0.07 +- 0.26 (ext. syst.)) x 10^-6,
  BR/BR(K_L->pi⁰pi⁰pi⁰_D) = (1.3302 +- 0.0046 +- 0.0102) x 10^-3,
  CalphaK* = -0.517 +- 0.030(fit) +- 0.022(syst.)
  alpha_DIP = -1.729 +- 0.043(fit) +- 0.028(syst.)
  
  Published in Phys. Rev. Lett. 99, 051804 (2007).
  hep-ex/0702039, [Plots]
  presented by Mike Wilking at Moriond EW 2006.
• BR = (10.19 +- 0.04(stat) +- 0.07(syst) +- 0.29 (ext. syst)) x 10^-6 (preliminary)
  based on 93.4k events.
  Form factor, alpha_K* = -0.186 +- 0.011 +- 0.009 (preliminary).
  Presented by Tony Barker at Fermilab Wine and Cheese, June 20, 2003.
  Detailed description is available in Jason LaDue's PhD thesis.
• BR = (10.13 +- 0.04 (stat.) +- 0.06 (syst.) +- 0.29 (ext. syst.)) x 10^-6 (preliminary),
  BR(KL->eeg)/BR(pi0->eeg) x BR(pi0->gg)/BR(KL->gg) = 1.426 +- 0.006 (stat.) +- 0.009 (syst.) +- 0.028 (ext. syst.) (preliminary),
  Form factor, alpha_K* = -0.192 +- 0.011 +- 0.009 (preliminary),
  based on 93.4k events observed in 1997 data.
  Presented by Jason LaDue at DPF2002, [plots].
  

K_L ->e⁺ e^- gamma gamma

• [Plots]
• BR(Egamma*>5MeV) = (5.84 +- 0.15 +- 0.32) x 10^-7 ,
  based on 1543 events including 56+-8 background events.
  Published in Phys. Rev. D 64, 012003 (2001).
  PRD abstract, [Plots]
  Submitted to PRD (Feb. 8, 2001).
• BR(Egamma*>5MeV) = (6.31 +- 0.14 +- 0.43) x 10^-7 (preliminary), based on 1988 - 76.6 = 1911.4 events.
  Presented by Taku Yamanaka at XXXIVth Rencontres de Moriond, March 13-20, 1999.
  Full description of the analysis is available in PhD thesis by Peter Mikelson.

K_L->mu⁺mu^-gamma

• [Plots]
• BR = (3.62 +- 0.04 +- 0.08) x 10^-7 ,
  alpha_K* = -0.160 +0.026-0.028,
  alpha = -1.54 +- 0.10,
  rho > -0.2
  Published in Phys. Rev. Lett. 87, 071801 (2001).
  PRL abstract, [Plots]
  Accepted by PRL (6/29/2001).
• BR = (3.66 +- 0.04 +- 0.07) x 10^-7 (preliminary),
  alpha_K* = -0.157 +0.025-0.027 (preliminary),
  alpha = -1.53 +- 0.09 (preliminary),
  Submitted to PRL (1/30/2001),
• BR = (3.70 +- 0.04 +- 0.07) x 10^-7(preliminary),
  presented by Yau W. Wah at ICHEP2000,
  Also presented by Breese Quinn at Fermilab Wine and Cheese.
  A full description is available in PhD thesis by Steve Bright
• Alpha_K* = -0.163 +0.026 -0.027 (BMS),
  Alpha = -1.55 +- 0.09; rho > -0.2 (DIP) (both preliminary),
  presented by Wah at ICHEP2000,
  Fermilab Wine and Cheese
• A plot with 6700 signal events, and (M_{mu mu}/M_K)² plot were shown at PANIC99 by Breese Quinn.

K_L->mu⁺mu^-gamma gamma

• [Plots]
• BR(M_{gamma gamma} > 1MeV/c²) = (10.4 +7.5 -5.9 +- 0.7) x 10^-9,
  BR(Egamma*>10MeV) = (1.42 +1.0 -0.8 +- 0.10) x 10^-9., based on 4 observed events.
  Published in Phys. Rev. D 62, 112001 (2000).
  PRD abstract, [Plots]
• BR(Egamma*>10MeV) = (1.42 +1.02 -0.81(stat) +- 0.14(sys)) x 10^-9 (preliminary), based on 4 observed events.
  Presented by Breese Quinn at PANIC99. Some plots are avilable in Julie Whitmore's talk at KAON99.

Ke3

• |f_T/f_+| <0.14 (90% CL) (preliminary),
  f_s/f_+ = -0.029 +0.008-0.012 +- 0.003 (preliminary),
  |f_s/f_+| <0.04 (90% CL) (preliminary),
  lambda_+ = 0.0274 +-0.008 +- 0.012 (preliminary) , based on ~280k events (3% data),
  presented by Rick Tesarek at DPF99

K_L->pi⁺e^-nu e⁺e^-

• [Plots]
• BR(KL->pi^+-e^-+nu e⁺e^-; M_ee>5MeV/c², E^*_ee > 30MeV) = (1.285 +- 0.041) x 10^-5,
  Gamma(Ke3ee, M_ee>5MeV/c²/Gamma(Ke3) = (4.57 +- 0.04 +- 0.14) x 10^-5
  
  based on 19.2k signal events.
  Presented by B. Tschirhart at Kaon'07.
  Submitted to Phys. Rev. Lett. (2007.05.24).
  Accepted for publication by Phys. Rev. Lett. (2007.07.14)
  Published in Phys. Rev. Lett. 99, 081803 (2007) (5 pages)
  PRL abstract, [Plots]
  Detailed description is available in Katsushige Kotera's PhD thesis.
• BR[M_ee>5MeV, E_ee>30MeV] = (1.281 +- 0.010 +- 0.019 +- 0.035(ext. syst.)) x 10^-5
  (preliminary)
  based on 19.5k candidate events with 5% background.
  This result supercedes the previous result which had an error.
  Presented by Mike Arenton at Heavy Quarks and Leptons 2006.
  Detailed description is available in Katsushige Kotera's PhD thesis.
• BR(M_ee>5MeV) = (1.606 +- 0.012 +0.026-0.016 (syst) +- 0.045 (ext.syst.)) x 10^-5 (ERROR was found with this result later)
  based on 19.5k events with 5% background.
  Presented by Mike Wilking at Moriond EW 2006.

K_L ->pi⁰ e⁺ e^- gamma

• BR = (1.62 +- 0.14 +- 0.09) x 10^-8
  based on 139 candidate events with 14 background events.
  Published in Phys. Rev. D 76 052001(2007).
  Submitted to Phys. Rev. D, arXiv:0706.4074 (Jun. 28, 2007).
  [PRD abstract], [Plots]
  Presented by Michael Ronquest at HQL2008.
• BR = (1.90 +- 0.16 +- 0.12) x 10^-8
  (preliminary) based on 47 candidate events with 2.7+-1.0 background events in 1997 data, and 92 candidate events with 11.7+-2.3 background events in 1999 data.
  Presented by Elliott Cheu at Heavy Quarks and Leptons 2006.
• BR = (2.34 +- 0.35 +- 0.13) x 10^-8
  based on 48 events with (3.6+-1.1) background events in 1997 data. Vector meson exchange parameter used in O(p⁶) Chiral perturbation theory, aV = -0.67 +- 0.21 +- 0.12.
  Published in Phys. Rev. Lett. 87, 021801 (2001).
  PRL abstract
  Accepted by PRL (5/11/01) . Submitted to PRL (11/28/00).
• BR = (2.20 +- 0.48 +- 0.11) x 10^-8 (preliminary), based on (18-0.43)=17.6 events.
  Presented by Elliott Cheu at ICHEP98, and Sydney Taeger at DPF99
  Full description is available in PhD thesis by Greg Graham.

K_L->pi⁺pi^-pi⁰gamma

• BR(E^cm_gamma > 10MeV) = (1.38 +- 0.03 +- 0.03) x 10^-3 BR(K_L->pi⁺pi^-pi⁰)
  BR = (1.70 +- 0.03 +- 0.04 +- 0.03(norm)) x 10^-4 (both PRELIMINARY)
  based on 2853 candidate events. Presented by A. Ledovskoy at KAON2005.

K_L->pi⁺pi^-pi⁰e⁺e^-

• BR(E_ee>20MeV) = (1.60 +- 0.18(stat)) x 10^-7 (PRELIMINARY)
  based on 132 candidates with 1.2+-0.9 background events. Presented by A. Ledovskoy at KAON2005.

K_L->pi⁰mu e

• [Plots]
• BR < 7.6 x 10^-11 (90% CL) BR < 7.56 x 10^-11 (90% CL) (PRELIMINARY) based on no observed events in 1997+1999 data with 0.66+-0.23 expected background events.
  Submitted to PRL (11/21/07).
  Accepted for publication by PRL (2/19/08)
  Published in Phys. Rev. Lett. 100, 131803 (2008).
  [PRL abstract], [Plots]
  Presented by Bob Tschirhart at KAON'07.
  BR < 5.33 x 10^-10 (90% CL) (PRELIMINARY) based on 1999 data, with 3 observed events.
  BR < 3.31 x 10^-10 (90% CL) (PRELIMINARY) based on 1997 + 1999 data combined.
  Presented by Angela Bellavance at DPF2002. [plots]
  Detailed description of an old analysis is available in PhD thesis by Angela Bellavance.
• BR < 4.4 x 10^-10 (90% CL) (PRELIMINARY) based on 1997 data with 2 observed events.
  Presented by Angela Bellavance at DPF2000.

K_L->pi⁰pi⁰mu e

• BR < 1.7 x 10^-10 (90% CL)
  BR < 1.64 x 10^-10 (90% CL) (preliminary)
  based on no observed events in 1997+1999 data with 0.44 +- 0.23 expected background events.
  Submitted to PRL (11/21/07). Accepted for publication by PRL (2/19/08)
  Published in Phys. Rev. Lett. 100, 131803 (2008).
  [PRL abstract], [Plots]
• BR < 1.58 x 10^-10 (90% CL) (preliminary)
  based on no observed events in 1997+1999 data with 0.44 +- 0.12 background events.
  Presented by Mike Arenton at Heavy Quarks and Leptons 2006.

pi⁰ ->e⁺ e^-

• [Plots]
• BR(pi⁰->e⁺e^-, (Mee/Mpi⁰)² > 0.95) = (6.44 +- 0.25 +- 0.22) x 10^-8 ,
  based on 794 candidate events with 52.7+-11.2 background events.
  Published in Phys. Rev. D 75, 012004 (2007).
  Accepted for publication in Phys. Rev. D (Nov. 16, 2006).
  PRD abstract, [Plots]
  hep-ex/0610072 Detailed description is available in Rune Niclasen's PhD thesis.
• BR(pi⁰->e⁺e^-, x>0.95) / BR(pi⁰->e⁺e^-gamma, x>0.232) = (1.721 +- 0.068 +- 0.036) x 10^-4 (x=(Mee/Mpi)²),
  (preliminary)
  BR[(Mee/Mpi)²>0.95] = (6.56 +- 0.026 +- 0.023) x 10^-8 (preliminary)
  based on 714 candidate events including 39.9+-12.3 background events.
  Presented by Rune Niclasen at PANIC05.
  Detailed description is available in Rune Niclasen's PhD thesis.
• BR = (6.09 +- 0.40 +- 0.24) x 10^-8 ((Mee/Mpi⁰)² >0.95), based on 253.6 signal events.
  Published in Phys. Rev. Lett. 83, 922 (1999).
  PRL abstract.
  Full description is available in PhD thesis by Eric Zimmerman.
  Presented by Eric at HQ98.
• BR = (6.16 +- 0.53 +- 0.23) x 10^-8 (preliminary), based on 163 events observed in Winter dataset.
  Presented by Tony Barker at ICHEP98.

pi⁰->e⁺e^-gamma

• BR(pi⁰->e⁺e^-gamma) /BR(pi⁰->e⁺e^-) = (1.1539+-0.0045+-0.0152)% (preliminary)
  based on 66.4k decays.
  Presented by Erin Abouzaid at DPF/JPS2006.

pi⁰ ->e⁺ e^- e⁺ e^-

• [Plots]
• BR(pi0 ->4e) BR(pi0->gg)/BR(pi0->eeg)² = 0.2329 +- 0.0015 +- 0.0010,
  BR(pi0->4e; x>0.9) = (3.26+-0.18) x 10^-5,
  based on 30511 candidate decays.
  Submitted to PRL, arXiv:0711.3472 (Feb. 15, 2008).
  Accepted for publication in Phys. Rev. Lett.
  Published in Phys. Rev. Lett. 100, 182001 (2008)(May 8, 2008)
  [PRL Abstract], [Plots]
  Detailed description is available in Pat Toale's PhD thesis.
  Presented at HQL2008 by Michael Ronquest.
• BR(pi0 ->4e)/BR(pi0->eeg)² = 0.2252 +- 0.0015 +- 0.0059 (preliminary),
  BR(pi0->4e)/BR(pi0->gg) = (3.274 +- 0.022 +- 0.197) x 10^-5 (preliminary).
  These results were derived by combining a new result from 1999 data with 17.4k events (after subtracting 475 background events) and the preliminary result from 1997 data reported previously. Presented by Patrick Toale at DPF2002. [plots]
  Detailed description is available in Pat Toale's PhD thesis.
• BR = (3.35 +- 0.04 +- 0.22) x 10^-5 (preliminary).
  Presented by Eric Zimmerman at HQ98
• BR = (3.31 +- 0.04 +- 0.22) x 10^-5 (preliminary) based on 10.5k (bkg subtracted) events.
  Presented by Tony Barker at ICHEP98.
• alpha (cos 2(ee-ee) dependence) = -0.239 +- 0.030 (Mee >10MeV) (preliminary).
  Presented by Tony Barker at ICHEP98.

pi⁰->mu e

• BR < 3.6 x 10^-10 (90% CL)
  BR < 3.59 x 10^-10 (90% CL) (preliminary)
  based on no observed events in 1997+1999 data where 0.03+-0.015 expected background events.
  Submitted to PRL (11/21/07). Accepted for publication by PRL (2/19/08)
  Published in Phys. Rev. Lett. 100, 131803 (2008).
  [PRL abstract], [Plots]
  Presented at HQL2008 by Michael Ronquest.
• BR < 3.63 x 10^-10 (90% CL) (preliminary)
  based on no observed events with 0.03 +- 0.02 background events.
  Presented by Mike Arenton at Heavy Quarks and Leptons 2006.
• BR < 7.85 x 10^-10 (90% CL) (preliminary)
  based on no events in 1997 data.
  Presented by Marj Corcoran at Workshop on e+e- in the 1-2 GeV Range.

Cascade⁰ ->Sigma⁺ e^- nu-bar

• BR = (2.54 +- 0.11 +- 0.16) x 10^-4 (preliminary)
  based on 626+-25 signal events.
  Presented by Ashkan Alavi-Harati at DPF99.
  Full description is available in PhD thesis by Ashkan Alavi-Harati.
• BR = (2.71 +- 0.22 +- 0.31) x 10^-4 , based on 176 events after background subtraction.
  Published in Phys. Rev. Lett. 82, 3751 (1999).
  PRL abstract
• BR = (2.49 +- 0.19 +- 0.31) x 10^-4 (preliminary), based on 153 events. (HQ98)
• 65 Anti-cascade beta decay events, shown by Doug Jensen at HQ98.
• S_e = 1.020 +- 0.037 +- 0.043 (preliminary) ,
  where S_e is the average polarization of the Sigma⁺ along the direction of the e^- in the decay.
  Presented by Steve Bright at the Lake Louise Winter Institute (1999).

Cascade⁰ -> Sigma⁺ e^- nu-bar form factors

• g1/f1 = 1.32 +0.21-0.17(stat.) +/- 0.05(syst.)
  g2/f1 = -1.7 +2.1-2.0(stat). +- 0.5(syst.)
  f2/f1 = 2.0 +- 1.2 (stat)+-0.5(syst)
  Published in Phys. Rev. Lett. 87, 132001 (2001).
  PRL abstract. Submitted to PRL (May 10, 2001).
  Full description is available in PhD thesis by Steve Bright.
• g1/f1 = 1.24 +0.20-0.17 +- 0.07 (assuming g2=0.0 and f2=2.6),
  g2/f1 = -1.4 +2.2-1.9 +- 0.5 (assuming f2=2.6),
  f2/f1 = 2.3 +- 1.2 +- 0.7, and
  f1 = 1.01 +- 0.14, g1 = 1.24 +- 0.07, (all preliminary)
  presented by Steve Bright at Hyperon99.

Cascade⁰ ->Sigma⁺ mu^- nu-bar

• Gamma(Cascade⁰->Sigma⁺mu^-nu)/ Gamma(Cascade⁰->Sigma⁺e^-nu) = (1.8^+0.7_-0.5+-0.2) x 10^-2,
  based on 9 observed events.
  Publilshed in Phys. Rev. Lett. 95, 081801 (2005).
  PRL abstract Accepted for publication by Phys. Rev. Lett. (July 11, 2005),
  Submitted to Phys. Rev. Lett. (May 4, 2005),
  hep-ex/0504055
  [Plots]
  Full description is available in PhD thesis by Ricardo Avelino Gomes.
• BR = (4.3 +- 1.4) x 10^-6 (preliminary)
  based on 9 events observed in 1999 data.
  Presented by Ricardo Gomes at BEACH2004.
• BR = (3.5 +2-1.6 +0.5-1.0) X 10^-6 (preliminary), still based on 5 events in 1997 data.
  Presented by Nick Solomey at Valencia (2000).
• BR = (2.6 +2.7-1.7 +- 0.6) x 10^-6 (preliminary) , based on 5 candidate events. The statistical error, +2.7/-1.7, shows the 90% Confidence Interval.
  Presented by Ashkan Alavi-Harati at DPF99.

Cascade⁰ ->Sigma⁰ gamma

• [Plots]
• BR = (3.34 +- 0.05 +- 0.09) X 10^-3 , based on 4045 signal events over 804 background events.
  Decay asymmetry alpha = -0.63 +- 0.09 .
  Published in Phys. Rev. Lett. 86, 3239-3243 (2001).
  PRL abstract, [Plots]
  Accepted by PRL (Feb. 16, 2001). Submitted to PRL (Dec. 13, 2000).
• BR = (3.34 +- 0.12 ) x 10^-3 (preliminary) .
  Presented by Doug Jensen at International Conference on Hyperons, Charm and Beauty Hadrons
• BR = (3.02 +- 0.04 +- 0.20) x 10^-3 (preliminary) ,
  presented by Doug Jensen at HQ98.
• Alpha = 0.65 +- 0.13 (preliminary).
  Presented by Doug Jensen at International Conference on Hyperons, Charm and Beauty Hadrons

Cascade⁰ ->Lambda gamma

• BR/BR(Cacdade -> Lambda pi0) = (0.94 +- 0.03) x 10^-3 (preliminary) , based on 1100 events,
  presented by Doug Jensen, at HQ98.

Cascade⁰ ->Lambda pi⁰

• proton-Lambda spin correlation in Lambda frame,
  alpha_Lambda x alpha_Cascade = -0.288 +- 0.007 +- 0.016 (preliminary),
  based on summer data.
  Presented by Roland Winston at ICHEP2000.

Cascade0 polarization

• [Plots]
• Cascade⁰ : P_y = -0.097 +- 0.007 +- 0.013 for p_t = 1.38GeV/c
  Anti Cascade⁰ : P_y = 0.000 +- 0.013 +- 0.013 for p_t = 1.22GeV/c.
  Published in Phys. Rev. D 75, 012005 (2007).
  PRD abstract Presented by Albert Erwin at Hyperon99
  Accepted for publication in Phys. Rev. D (Dec. 12, 2006).
  Submitted to Phys. Rev. D (August? 2006)
  [Plots]

H dibaryon

• Excluded H (uuddss bound state) in 2.194 < M_H(GeV/c²) <2.231, with lifetimes from ~5E-10sec to ~1E-3sec.
  Published in Phys. Rev. Lett. 84, 2593 (2000).
  PRL abstract
  Presented by Ram Ben-David at PANIC99.

KTeV E832 results

[Top] [E799]

epsilon'/epsilon

• [Plots]
• Re(e'/e) = (19.2 +- 1.1(stat) +- 1.8(syst)) x 10^-4
  = (19.2 +- 2.1) x 10^-4 (Preliminary)
  based on full (1997 + 1999) data set. This result supersedes the published result shown below.
  Presented by Elizabeth Worcester at Fermilab Wine and Cheese on Feb. 25, 2008.
  Full description is available in PhD thesis by Elizabeth Turner Worcester
• Re(e'/e) = (20.7 +- 1.48(stat) +- 2.39(syst)) x 10^-4
  = (20.7 +- 2.8) x 10^-4
  Published in Phys. Rev. D67, 012005 (2003).
  PRD abstract [Plots]
  Accepted by Phys. Rev. D. (Nov. 8, 2002), Submitted to Phys. Rev. D. (August 6, 2002)
  hep-ex/0208007,
• Re(e'/e) = (20.7 +- 1.5(stat) +- 2.4(syst) +- 0.5(MC stat)) x 10^-4
  = (20.7 +- 2.8) x 10^-4 (preliminary) [combined result for the 1996-1997 dataset]
  Re(e'/e) = (19.8 +- 1.7(stat) +- 2.3(syst) +- 0.6(MC stat)) x 10^-4 (preliminary) [1997 data set]
  Re(e'/e) = (23.2 +- 3.0(stat) +- 3.2(syst) +- 0.7(MC stat)) x 10^-4 (preliminary) [Reanalysis of the published result]
  Full description is available in PhD thesis by Jim Graham (Dec. 2001) and PhD thesis by Valmiki Prasad (June 2002).
  Presented by Jim Graham at Fermilab Wine and Cheese on June 8, 2001. Slides: (compressed PS, 0.67Mb), (PS, 2.9Mb)
• [The next result has been superseded by the above result.]
  Re(e'/e) = ( 28.0 +- 3.0(stat) +- 2.8(syst) ) x 10^-4
  = ( 28.0 +- 4.1 ) x 10^-4,
  based on 20% of data taken in 1996-1997 runs.
  Published in Phys. Rev. Lett. 83, 22 (1999).
  PRL abstract [Plots]
  Full description is available in PhD thesis by Peter S. Shawhan.
  Presented by Peter Shawhan at Fermilab Wine and Cheese, on Feb. 24, 1999.
  The result, and sample slides from the presentation.
  What is this all about?
  

delta m, tau_S, Phi_+-, delta Phi (CPT test)

• delta m = (5269.9 +- 12.3) x 10⁶h/s (assuming CPT)
  tau_S = (89.623 +- 0.047) x 10^-12s (assuming CPT)
  phi_epsilon = (43.86 +- 0.63)^o (No CPT assumption)
  phi_epsilon - phi_SW = (0.40 +- 0.56)^o (No CPT assumption)
  delta phi = (0.30 +- 0.35)^o (No CPT assumption)
  (All preliminary)
  based on full (1997 + 1999) data set. These results supersede the published result shown below.
  Presented by Elizabeth Worcester at Fermilab Wine and Cheese on Feb. 25, 2008.
• delta m = (5261 +- 15) x 10⁶h/s
  tau_S = (89.65 +- 0.07) x 10^-12s
  phi_+- - phi_SW = (+0.61 +- 1.19)^o
  phi₀₀ - phi_+- = (+0.39 +- 0.50)^o
  Im(e'/e) = (-22.9 +- 29.1 ) x 10^-4
  
  Pubilshed in Phys. Rev. D67, 012005 (2003).
  PRD abstract [Plots]
  Submitted to Phys. Rev. D (August 6, 2002),
  
• tau_S = (8965 +- 3 (stat) +- 4 (syst)) x 10^-14 s
  delta m = (5267 +- 6 (stat) +- 14 (syst)) x 10⁶ h/s
  phi_+- = 44.12 +- 0.72 (stat) +- 1.14 (syst) deg
  (ALL PRELIMINARY)
  Full description is available in PhD thesis by Jim Graham (Dec. 2001) and PhD thesis by Valmiki Prasad (June 2002).
  
• tau_S = (8967.1 +- 3.5 (exp) +- 4 (th)) x 10^-14 s
  delta m = (5262 +- 7.7 (exp) +- 13 (th)) x 10⁶ h/s
  phi_+- = 44.11 +- 0.72 (stat) +- 1.1 (syst) deg
  delta phi = 0.41 +- 0.22 (stat) +- 0.53 (syst)
  (ALL PRELIMINARY)
  presented by Jim Graham at Fermilab Wine and Cheese on June 8, 2001. Slides: (compressed PS, 0.67Mb), (PS, 2.9Mb)

• Fit assuming CPT (Phi_+- = Phi_SW)
  tau_S = (0.8967 +- 0.0007) x 10^-10 s
  detla m = (0.5280 +- 0.0013) x 10¹⁰ h/s
  chisq/dof = 371/353 (all preliminary)

  Fit not assuming CPT
  delta m = (0.5286 +- 0.0023) x 10^-10 h/s
  Phi_+- = (43.66 +- 0.30)deg + 0.23deg x (delta m - 0.5286)/0.0010 - 0.26deg x (tau_S - 0.8967)/0.0010
  delta Phi = (0.09 +- 0.43 +- 0.15) deg (all preliminary)

  (all preliminary), presented by Yee Bob Hsiung at KAON99.

K_L->pi e nu charge asymmetry

• [Plots]
• delta = (3322 +- 58 (stat) +- 47 (syst) ) x 10^-6
  Published in Phys. Rev. Lett. 88, 181601 (2002).
  PRL abstract, [Plots]
  Accepted by PRL (Mar. 28, 2002).
  Full description is available in PhD thesis by G. Colin Bown.
• delta = (3320 +- 58 (stat) +- 46 (syst) ) x 10^-6 (PRELIMINARY)
  Presented by Hogan Nguyen at Fermilab Wine and Cheese (Feb. 16, 2001), BCP4 at Ise-Shima, Japan (Feb. 19-23, 2001), Les Recontres de Physique de la Vallee d'Aoste at LaThuille (Mar. 4-10, 2001)

K_L ->pi⁺ pi^- gamma

• [Plots]
• |g_M1| = 1.198 +- 0.035 +- 0.086
  a1/a2 = -0.738 +- 0.007 +- 0.018 GeV²/c²
  |g_E1| < 0.21 (90% CL)
  DE/(DE+IB) = 0.689 +- 0.021 (E_gamma* >= 20MeV
  based on 112.1k events with 671+-41 background events.
  Submitted to Phys. Rev. Lett. (Mar. 17, 2006) Accepted for publication in PRD (2006.07.20).
  Phys. Rev. D 74, 032004 (2006) [Plots]
• a1/a2 = -0.737 +- 0.034 GeV^2,
  Gamma(KL->pi+ pi- gamma, E^*gamma > 20MeV) / Gamma( KL->pi+ pi-) = (20.8 +- 0.3) x 10^-3,
  KL-> pi+ pi- gamma DE/(DE+IB) branching ratio = 0.683 +- 0.011.
  Published in Phys. Rev. Lett. 86, 761-764 (2001).
  PRL abstract
  Accepted by Phys. Rev. Lett. (11/28/00)
  [Plots]
• a1/a2 = -0.729 +- 0.026 +- 0.015,
  DE/(DE+IB) (Eg*>20MeV) = 0.685 +- 0.009 +- 0.017
  DE/ALL (Eg^*>20MeV) = (3.19 +- 0.09) x 10^-5 (all preliminary)
  presented by John Belz at DPF99.

K_L ->pi⁰ gamma gamma

• [Plots]
• BR = (1.29 +- 0.03 +- 0.05) x 10^-6 and
  a_v = -0.31 +- 0.05 +- 0.07
  based on 1982 events with 608 background events collected from 1997 to 2000. These result supersede earlier KTeV results.
  Published in Phys. Rev. D 77, 112004 (2008). Accepted for publication in Phys. Rev. D (May 9, 2008)
  Submitted to Phys. Rev. D (April 2008, 2008).
  arXiv:0805.0031
  [Plots]
  Detailed description is available in PhD thesis by Jianbo Wang.
  Presented at HQL2008 by Michael Ronquest.
• BR = (1.30 +- 0.03 +- 0.04) x 10^-6
  (preliminary) with correct background estimation and new KL->2pi0 BR. This supercedes previous KTeV result.
  Presented by Elliott Cheu at Heavy Quarks and Leptons 2006
  Detailed description is available in PhD thesis by Jianbo Wang.
• aV = -0.31 +- 0.05 +- 0.07 (PRELIMINARY)
  Submitted to Phys. Rev. D (April 2008, 2008).
  presented by Elliott Cheu at KAON'07.
• BR = (1.68 +- 0.07 +- 0.08) x 10^-6,
  effective vector coupling aV = -0.72 +/- 0.05 +/- 0.06 (preliminary) based on 884 events, with 111+-12 background events.
  Published in Phys. Rev. Lett. 83, 917 (1999).
  PRL abstract [Plots]
  
• BR = (1.76 +- 0.06 +- 0.09)x10^-6 (preliminary), based on (907-111)=796 events,
  presented by Eric Zimmerman at HQ98, and Sydney Taeger at DPF99
• BR = (1.47 +- 0.06 +- 0.11 ) x 10^-6 (preliminary), based on 103+-18 events,
  presented by Elliott Cheu at ICHEP98. [THIS RESULT WAS LATER CORRECTED FOR A NORMALIZATION PROBLEM.]
• a_v = -0.77 +- 0.05 +- 0.04 (preliminary)
  presented by Sydney Taeger at DPF99

K_e3 radiative decay

• [Plots]
• BR (Ke3gamma, Egamma^*>30 MeV, theta_{e gamma}* >20 deg)/BR (Ke3) = 0.908+-0.008(stat)_-0.012^+0.013(syst)%
  Published in Phys. Rev. D 64, 112004 (2001).
  PRD abstract [Plots]
  Accepted by PRD (Nov. 12, 2001), submitted to PRD (6/15/2001).

K_L->pi⁰pi⁰pi⁰ Dalitz Plot

• [Plots]
• Dalitz parameters: h₀₀₀ = (-2.09 +- 0.62 stat +- 0.72 syst +- 0.28 ext) x 10^-3,
  m_m+(a₀-a₂) = 0.215 +- 0.014 stat +- 0.025 syst +- 0.006 ext
  Submitted to Phys. Rev. D (June 24, 2008).
  Accepted for publication by Phys. Rev. D (July 15, 2008).
  Published in Phys. Rev. D 78, 032009 (2008).
  [Plots]
  Presented by Rick Kessler at Beach 2008.

K_L->pi⁺pi^-pi⁰gamma

• BR(E^*_gamma > 10MeV) = (1.66 +- 0.05) x 10^-4 (PRELIMINARY)
  Full description is available in PhD thesis by Miguel Barrio (Dec. 2001)

|V_us|

• [Plots]
• |V_us| = 0.2252 +- 0.0008(KTeV) +- 0.0021(ext)
  |eta_+-| = (2.228 +- 0.005(KTeV) +- 0.009(ext)) x 10^-3
  Published in Phys. Rev. Lett. 93, 181802 (2004) , PRL abstract
  Submitted to Phys. Rev. Lett. (June 1, 2004), hep-ex/0406001 [Plots]
  Presented by Rick Kessler at Heavy Quark & Leptons 2004, and
  Ed Blucher at Fermilab Wine and Cheese.

K_L Branching Fractions and |eta_+-|

• [Plots]
• B(K_L->pi e nu) = 0.4067 +- 0.0011
  B(K_L->pi mu nu) = 0.2701 +- 0.0009
  B(K_L->pi⁺pi^-pi⁰) = 0.1252 +- 0.0007
  B(K_L->pi⁰pi⁰pi⁰) = 0.1945 +- 0.0018
  B(K_L->pi⁺pi^-) = (1.975+-0.012) x 10^-3
  B(K_L->pi⁰pi⁰) = (0.865 +- 0.010) x 10^-3
  |eta_+-| = (2.228 +- 0.010) x 10^-3
  Published in Phys. Rev. D 70, 092006 (2004).
  PRD abstract,
  Submitted to Phys. Rev. D (June 1, 2004),
  hep-ex/0406002 [Plots]
  Presented by Rick Kessler at Heavy Quark & Leptons 2004, and
  Ed Blucher at Fermilab Wine and Cheese.

Kl3 Form Factors

• [Plots]
• I(Ke3) = 0.15392 +- 0.00048
  based on reanalyzed 2M Ke3 events using a new form factor expansion.
  Published in Phys. Rev. D 74, 097101 (2006).
  PRD abstract [Plots]
• f₊(t): lambda'₊ = (20.64 +- 1.75) x 10^-3, lambda''₊ = (3.20 +- 0.69) x 10^-3.
  f₀(t): lambda₀ = (13.72 +- 1.31) x 10^-3.
  Phase space integrals:
  I(Ke3) = 0.15350 +- 0.00105,
  I(Kmu3) = 0.10165 +- 0.00080
  based on 1.9M Ke3 and 1.5M Kmu3 decays.
  Published in Phys. Rev. D 70, 092007 (2004).
  PRD abstract,
  Submitted to Phys. Rev. D (June 1, 2004),
  hep-ex/0406003 [Plots]
  Presented by Rick Kessler at Heavy Quark & Leptons 2004, and
  Ed Blucher at Fermilab Wine and Cheese.

Kl3 Radiative Decays

• [Plots]
• Gamma(KL->pi mu nu gamma; E_g^*>10MeV) / Gamma(KL->pi mu nu) = 0.530 +- 0.019% based on 1385 events, and
  Gamma(KL->pi e nu gamma; E_g^*>10MeV) / Gamma(KL->pi e nu) = 4.942 +- 0.062% based on 14221 events.
  Published in Phys. Rev. D 71, 012001 (2005).
  PRD abstract, [Plots]
  Submitted to Phys. Rev. D (Oct. 24, 2004), hep-ex/0410070

K^*

• [Plots]
• Gamma(K₁(1400)) = 280.8 +- 23.2(stat) +- 40.4(syst) keV,
  Gamma(K₁(1270)) = 73.2 +- 6.1(stat) +- 28.3(syst) keV,
  based on 147 candidate events.
  Gamma(K^*(1410); vector state) < 52.9 keV (90% CL),
  Gamma(K^*₂(1430); tensor state) < 5.4 keV (90% CL).
  Published in Phys. Rev. Lett. 89, 072001 (2002),
  PRL abstract [Plots]
  Accepted by Phys. Rev. Lett. (Jun. 21, 2002). Submitted to Phys. Rev. Lett. (Oct. 10, 2001).

R⁰: Light Gluino

• [Plots]
• Excluded the decays R0->pi⁺ pi^- photino and R0->pi⁰ photino for the masses of R0 and photino in the theoretically allowed range, including 3E-10s <R0 lifetime <1E-3s for R0 mass <3GeV/c².
  Published in Phys. Rev. Lett. 83, 2128-2132 (1999)
  PRL abstract, [Plots]
  
• New excluded region by using R0->pi⁰ photino, presented by Amit Lath, at DPF99
• [The next result has been superseded by the above result.]
  Searched M_pipi > 648MeV/c², and excluded R0 in mass:1.2 - 4.6GeV/c², and lifetime: 2E-10 - 7E-4sec.
  Published in Phys. Rev. Lett. 79, 4083 (1997).
  PRL abstract, Fermilab-Pub-97-320-E (pdf) (ps)

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