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Measurement of the parity-violating asymmetry parameter alpha_b and the helicity amplitudes for the decay Lambda_b->J/psi+Lambda with the ATLAS detector
- 1.0432871 - FZÚ 2015 RIV US eng J - Journal Article
Aad, G. - Abajyan, T. - Abbott, B. - Böhm, Jan - Chudoba, Jiří - Havránek, Miroslav - Hejbal, Jiří - Jakoubek, Tomáš - Kepka, Oldřich - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Myška, Miroslav - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek - Vrba, Václav … Total 2897 authors
Measurement of the parity-violating asymmetry parameter alpha_b and the helicity amplitudes for the decay Lambda_b->J/psi+Lambda with the ATLAS detector.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 89, č. 9 (2014), "092009-1"-"092009-12". ISSN 1550-7998
R&D Projects: GA MŠMT(CZ) LG13009
Institutional support: RVO:68378271
Keywords : J/psi(3100) * leptonic decay * ATLAS * CERN LHC Coll * Heavy Quark Effective Theory * Lambda/b0 * hadronic decay
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 4.643, year: 2014
A measurement of the parity-violating decay asymmetry parameter, alpha_b, and the helicity amplitudes for the decay Lambda_b->J/psi(mu mu)+Lambda(p pi) is reported. The analysis is based on 1400 Lambda_b and anti-Lambda_b baryons selected in 4.6/fb 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 Lambda_b and anti-Lambda_b samples under the assumption of CP conservation, the value of alpha_b 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.
Permanent Link: http://hdl.handle.net/11104/0237218
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