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Measurement of the Lambda(0)(b) lifetime and mass in the ATLAS experiment
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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2013 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, 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. no 3, 032002- p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-197111DOI: 10.1103/PhysRevD.87.032002ISI: 000314684500001OAI: oai:DiVA.org:uu-197111DiVA: diva2:611733
Note

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevD.87.032002

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

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Brenner, RichardBuszello, Claus P.Ekelöf, TordEllert, MattiasFerrari, ArnaudIsaksson, CharliePelikan, Daniel

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