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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
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: 2897
2014 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 89, no 9Article 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
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Physical Sciences
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URN: urn:nbn:se:kth:diva-147827DOI: 10.1103/PhysRevD.89.092009ISI: 000336651300001Scopus ID: 2-s2.0-84902007565OAI: oai:DiVA.org:kth-147827DiVA: diva2:732397
Note

QC 20140704

Available from: 2014-07-04 Created: 2014-07-04 Last updated: 2017-12-05Bibliographically approved

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Strandberg, Jonas

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