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Measurement of the parity-violating asymmetry parameter ab and the helicity amplitudes for the decay Lambda(0)(b) -> J/psi Lambda(0) with the ATLAS detector
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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2014 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 89, no 9, 092009- p.Article in journal (Refereed) Published
Abstract [en]

A measurement of the parity-violating decay asymmetry parameter, ab, and the helicity amplitudes for the decay.Lambda(0)(b) -> J/psi(mu(+) mu(-)) Lambda(0)(p pi(-)) is reported. The analysis is based on 1400 Lambda(0)(b)and (Lambda) over bar (0)(b) baryons selected in 4.6 fb(-1) of proton-proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the.0 b and. _ 0 b samples under the assumption of CP conservation, the value of ab is measured to be 0.30 +/- 0.16(stat) +/- 0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory.

Place, publisher, year, edition, pages
2014. Vol. 89, no 9, 092009- p.
National Category
Astronomy, Astrophysics and Cosmology Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:uu:diva-228503DOI: 10.1103/PhysRevD.89.092009ISI: 000336651300001OAI: oai:DiVA.org:uu-228503DiVA: diva2:734225
Note

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevD.89.092009

Available from: 2014-07-15 Created: 2014-07-15 Last updated: 2017-12-05Bibliographically approved

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Brenner, RichardBuszello, Claus P.Coniavitis, EliasEkelöf, TordEllert, MattiasFerrari, ArnaudIsaksson, CharlieMadsen, AlexanderÖhman, HenrikPelikan, Daniel

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Brenner, RichardBuszello, Claus P.Coniavitis, EliasEkelöf, TordEllert, MattiasFerrari, ArnaudIsaksson, CharlieMadsen, AlexanderÖhman, HenrikPelikan, Daniel
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High Energy Physics
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Physical Review D
Astronomy, Astrophysics and CosmologyAccelerator Physics and Instrumentation

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