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Title: Measurement of the Lambda(b) lifetime in the exclusive decay Lambda(b) ---> J / psi Lambda

Abstract

We have measured the {lambda}{sub b} lifetime using the exclusive decay {lambda}{sub b}{yields}J/{psi}{lambda}, based on 1.2 fb{sup -1} of data collected with the D0 detector during 2002-2006. From 171 reconstructed {lambda}{sub b} decays, where the J/{psi} and {lambda} are identified via the decays J/{psi}{yields}{mu}{sup +}{mu}{sup -} and {lambda}{yields}p{pi}, we measured the {lambda}{sub b} lifetime to be {tau}({lambda}{sub b})=1.218{sub -0.115}{sup +0.130}(stat){+-}0.042(syst) ps. We also measured the B{sup 0} lifetime in the decay B{sup 0}{yields}J/{psi}({mu}{sup +}{mu}{sup -})K{sub S}{sup 0}({pi}{sup +}{pi}{sup -}) to be {tau}(B{sup 0})=1.501{sub -0.074}{sup +0.078}(stat){+-}0.050(syst) ps, yielding a lifetime ratio of {tau}({lambda}{sub b})/{tau}(B{sup 0})=0.811{sub -0.087}{sup +0.096}(stat){+-}0.034(syst = )

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
918734
Report Number(s):
FERMILAB-PUB-07-094-E
arXiv eprint number arXiv:0704.3909; TRN: US0805906
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.Lett.99:142001,2007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DECAY; LIFETIME; FERMILAB; Experiment-HEP

Citation Formats

Abazov, V.M., Abbott, B., Abolins, M., Acharya, B.S., Adams, M., Adams, T., Aguilo, E., Ahn, S.H., Ahsan, M., Alexeev, G.D., Alkhazov, G., and /Buenos Aires U. /Rio de Janeiro, CBPF /Rio de Janeiro State U. /Sao Paulo, IFT /Alberta U. /Simon Fraser U. /York U., Canada /McGill U. /Hefei, CUST /Andes U., Bogota /Charles U.. Measurement of the Lambda(b) lifetime in the exclusive decay Lambda(b) ---> J / psi Lambda. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.99.142001.
Abazov, V.M., Abbott, B., Abolins, M., Acharya, B.S., Adams, M., Adams, T., Aguilo, E., Ahn, S.H., Ahsan, M., Alexeev, G.D., Alkhazov, G., & /Buenos Aires U. /Rio de Janeiro, CBPF /Rio de Janeiro State U. /Sao Paulo, IFT /Alberta U. /Simon Fraser U. /York U., Canada /McGill U. /Hefei, CUST /Andes U., Bogota /Charles U.. Measurement of the Lambda(b) lifetime in the exclusive decay Lambda(b) ---> J / psi Lambda. United States. doi:10.1103/PhysRevLett.99.142001.
Abazov, V.M., Abbott, B., Abolins, M., Acharya, B.S., Adams, M., Adams, T., Aguilo, E., Ahn, S.H., Ahsan, M., Alexeev, G.D., Alkhazov, G., and /Buenos Aires U. /Rio de Janeiro, CBPF /Rio de Janeiro State U. /Sao Paulo, IFT /Alberta U. /Simon Fraser U. /York U., Canada /McGill U. /Hefei, CUST /Andes U., Bogota /Charles U.. Sun . "Measurement of the Lambda(b) lifetime in the exclusive decay Lambda(b) ---> J / psi Lambda". United States. doi:10.1103/PhysRevLett.99.142001. https://www.osti.gov/servlets/purl/918734.
@article{osti_918734,
title = {Measurement of the Lambda(b) lifetime in the exclusive decay Lambda(b) ---> J / psi Lambda},
author = {Abazov, V.M. and Abbott, B. and Abolins, M. and Acharya, B.S. and Adams, M. and Adams, T. and Aguilo, E. and Ahn, S.H. and Ahsan, M. and Alexeev, G.D. and Alkhazov, G. and /Buenos Aires U. /Rio de Janeiro, CBPF /Rio de Janeiro State U. /Sao Paulo, IFT /Alberta U. /Simon Fraser U. /York U., Canada /McGill U. /Hefei, CUST /Andes U., Bogota /Charles U.},
abstractNote = {We have measured the {lambda}{sub b} lifetime using the exclusive decay {lambda}{sub b}{yields}J/{psi}{lambda}, based on 1.2 fb{sup -1} of data collected with the D0 detector during 2002-2006. From 171 reconstructed {lambda}{sub b} decays, where the J/{psi} and {lambda} are identified via the decays J/{psi}{yields}{mu}{sup +}{mu}{sup -} and {lambda}{yields}p{pi}, we measured the {lambda}{sub b} lifetime to be {tau}({lambda}{sub b})=1.218{sub -0.115}{sup +0.130}(stat){+-}0.042(syst) ps. We also measured the B{sup 0} lifetime in the decay B{sup 0}{yields}J/{psi}({mu}{sup +}{mu}{sup -})K{sub S}{sup 0}({pi}{sup +}{pi}{sup -}) to be {tau}(B{sup 0})=1.501{sub -0.074}{sup +0.078}(stat){+-}0.050(syst) ps, yielding a lifetime ratio of {tau}({lambda}{sub b})/{tau}(B{sup 0})=0.811{sub -0.087}{sup +0.096}(stat){+-}0.034(syst = )},
doi = {10.1103/PhysRevLett.99.142001},
journal = {Phys.Rev.Lett.99:142001,2007},
number = ,
volume = ,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}
  • We measure the {Lambda}{sub b}{sup 0} lifetime in the fully reconstructed decay {Lambda}{sub b}{sup 0} {yields} J/{psi}{Lambda}{sup 0} using 10.4 fb{sup -1} of p{bar p} collisions collected with the D0 detector at {radical}s = 1.96 TeV. The lifetime of the topologically similar decay channel B{sup 0} {yields} J/{psi}K{sub S}{sup 0} is also measured. We obtain {tau}({Lambda}{sub b}{sup 0}) = 1.303 {+-} 0.075(stat) {+-} 0.035(syst) ps and {tau}(B{sup 0}) = 1.508 {+-} 0.025(stat) {+-} 0.043(syst) ps. Using these measurements, we determine the lifetime ratio of {tau}({Lambda}{sub b}{sup 0})/{tau}(B{sup 0}) = 0.864 {+-} 0.052(stat) {+-} 0.033(syst).
  • We have measured the {lambda}{sub b} lifetime using the exclusive decay {lambda}{sub b}{yields}J/{psi}{lambda}, based on 1.2 fb{sup -1} of data collected with the D0 detector during 2002-2006. From 171 reconstructed {lambda}{sub b} decays, where the J/{psi} and {lambda} are identified via the decays J/{psi}{yields}{mu}{sup +}{mu}{sup -} and {lambda}{yields}p{pi}, we measured the {lambda}{sub b} lifetime to be {tau}({lambda}{sub b})=1.218{sub -0.115}{sup +0.130}(stat){+-}0.042(syst) ps. We also measured the B{sup 0} lifetime in the decay B{sup 0}{yields}J/{psi}({mu}{sup +}{mu}{sup -})K{sub S}{sup 0}({pi}{sup +}{pi}{sup -}) to be {tau}(B{sup 0})=1.501{sub -0.074}{sup +0.078}(stat){+-}0.050(syst) ps, yielding a lifetime ratio of {tau}({lambda}{sub b})/{tau}(B{sup 0})=0.811{sub -0.087}{sup +0.096}(stat){+-}0.034(syst = )
  • The lifetime of the {ital B}{sup 0}{sub {ital s}} meson is measured using the exclusive decay mode {ital B}{sup 0}{sub {ital s}}{r_arrow}{ital J}/{psi}{phi}, where {ital J}/{psi}{r_arrow}{mu}{sup +}{mu}{sup {minus}} and {phi}{r_arrow}{ital K}{sup +}{ital K}{sup {minus}}. The data sample consists of 110 pb{sup {minus}1} of {ital p{bar p}} collisions at {radical}{ital s}=1.8 TeV, collected by the CDF detector at the Fermilab Tevatron collider during 1992{endash}1995. We find 58{plus_minus}12 signal events, and the {ital B}{sup 0}{sub {ital s}} meson lifetime is determined to be {tau}{sub {ital B}{sup 0}{sub {ital s}}}=1.34{sub {minus}0.19}{sup +0.23}(stat){plus_minus}0.05(syst) ps. This result is consistent with previous measurements of the {italmore » B}{sup 0}{sub {ital s}}, {ital B}{sup +}, and {ital B}{sup 0}{sub {ital d}} meson lifetimes and with theoretical predictions. {copyright} {ital 1996 The American Physical Society.}« less
  • We report a measurement of the {lambda}{sub b}{sup 0} lifetime in the exclusive decay {lambda}{sub b}{sup 0}{yields}J/{psi}{lambda}{sup 0} in pp collisions at {radical}(s)=1.96 TeV using an integrated luminosity of 1.0 fb{sup -1} of data collected by the CDF II detector at the Fermilab Tevatron. Using fully reconstructed decays, we measure {tau}({lambda}{sub b}{sup 0})=1.593{sub -0.078}{sup +0.083}(stat){+-}0.033(syst) ps. This is the single most precise measurement of {tau}({lambda}{sub b}{sup 0}) and is 3.2{sigma} higher than the current world average.
  • This thesis presents the results from the measurement of the lifetimes of B+ and B0 mesons in four nal states in pp collisions at √s = 1:96TeV using 195 pb.