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Measurement of the Lambda(0)(b) lifetime and mass in the ATLAS experiment
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 2873
2013 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 87, no 3, 032002- p.Article in journal (Refereed) Published
Abstract [en]

A measurement of the Lambda(0)(b) lifetime and mass in the decay channel Lambda(0)(b) -> J/psi (mu(+) mu(-))Lambda(0)(p pi(-)) is presented. The analysis uses a signal sample of about 2200 Lambda(0)(b) and (Lambda) over bar (0)(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(0)(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.

Place, publisher, year, edition, pages
2013. Vol. 87, no 3, 032002- p.
Keyword [en]
Decays
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-119584DOI: 10.1103/PhysRevD.87.032002ISI: 000314684500001Scopus ID: 2-s2.0-84873686778OAI: oai:DiVA.org:kth-119584DiVA: diva2:611700
Funder
Swedish Research Council
Note

QC 20130318. Author count: 2873

Available from: 2013-03-18 Created: 2013-03-18 Last updated: 2017-12-06Bibliographically approved

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Strandberg, Jonas

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