Measurement of the Lambda_b lifetime and mass in the ATLAS experiment

ATLAS Collaboration; Wahid Bhimji; Andy Buckley; Philip Clark; Robert Harrington; Victoria Martin

doi:10.1103/PhysRevD.87.032002

Measurement of the Lambda_b lifetime and mass in the ATLAS experiment

ATLAS Collaboration, Wahid Bhimji, Andy Buckley, Philip Clark, Robert Harrington, Victoria Martin

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

A measurement of the Lambda_b lifetime and mass in the decay channel Lambda_b -> J/psi(mu^+ mu^-) Lambda^0(p pi^-) is presented. The analysis uses a signal sample of about 2200 Lambda_b and anti-Lambda_b decays that are reconstructed in 4.9 fb^-1 of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the Lambda_b lifetime and mass. They are measured to be tau(Lambda_b) = 1.449 +/- 0.036(stat) +/- 0.017(syst) ps and m(Lambda_b) = 5619.7 +/- 0.7(stat) +/- 1.1(syst) MeV.

Original language	English
Article number	32002
Journal	Physical Review D
Volume	D87
DOIs	https://doi.org/10.1103/PhysRevD.87.032002
Publication status	Published - 2013

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10.1103/PhysRevD.87.032002

http://arxiv.org/abs/1207.2284

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title = "Measurement of the Lambda_b lifetime and mass in the ATLAS experiment",

abstract = "A measurement of the Lambda_b lifetime and mass in the decay channel Lambda_b -> J/psi(mu^+ mu^-) Lambda^0(p pi^-) is presented. The analysis uses a signal sample of about 2200 Lambda_b and anti-Lambda_b decays that are reconstructed in 4.9 fb^-1 of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the Lambda_b lifetime and mass. They are measured to be tau(Lambda_b) = 1.449 +/- 0.036(stat) +/- 0.017(syst) ps and m(Lambda_b) = 5619.7 +/- 0.7(stat) +/- 1.1(syst) MeV.",

author = "{ATLAS Collaboration} and Wahid Bhimji and Andy Buckley and Philip Clark and Robert Harrington and Victoria Martin",

note = "CERN-PH-EP-2012-163",

year = "2013",

doi = "10.1103/PhysRevD.87.032002",

language = "English",

volume = "D87",

journal = "Physical Review D",

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T1 - Measurement of the Lambda_b lifetime and mass in the ATLAS experiment

AU - ATLAS Collaboration

AU - Bhimji, Wahid

AU - Buckley, Andy

AU - Clark, Philip

AU - Harrington, Robert

AU - Martin, Victoria

N1 - CERN-PH-EP-2012-163

PY - 2013

Y1 - 2013

N2 - A measurement of the Lambda_b lifetime and mass in the decay channel Lambda_b -> J/psi(mu^+ mu^-) Lambda^0(p pi^-) is presented. The analysis uses a signal sample of about 2200 Lambda_b and anti-Lambda_b decays that are reconstructed in 4.9 fb^-1 of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the Lambda_b lifetime and mass. They are measured to be tau(Lambda_b) = 1.449 +/- 0.036(stat) +/- 0.017(syst) ps and m(Lambda_b) = 5619.7 +/- 0.7(stat) +/- 1.1(syst) MeV.

AB - A measurement of the Lambda_b lifetime and mass in the decay channel Lambda_b -> J/psi(mu^+ mu^-) Lambda^0(p pi^-) is presented. The analysis uses a signal sample of about 2200 Lambda_b and anti-Lambda_b decays that are reconstructed in 4.9 fb^-1 of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the Lambda_b lifetime and mass. They are measured to be tau(Lambda_b) = 1.449 +/- 0.036(stat) +/- 0.017(syst) ps and m(Lambda_b) = 5619.7 +/- 0.7(stat) +/- 1.1(syst) MeV.

U2 - 10.1103/PhysRevD.87.032002

DO - 10.1103/PhysRevD.87.032002

M3 - Article

SN - 1550-7998

VL - D87

JO - Physical Review D

JF - Physical Review D

M1 - 32002

ER -

Measurement of the Lambda_b lifetime and mass in the ATLAS experiment

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