Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ 0 b →J/ψ⁰ with the ATLAS detector

Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kruker, Tobias; Marti, Lukas; Meloni, Federico; Schneider, Basil; Sciacca, Gianfranco; Stramaglia, Maria; Stucci, Stefania Antonia; Weber, Michael (2014). Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ 0 b →J/ψ⁰ with the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, D89(9), 092009. Melville, N.Y.: American Physical Society 10.1103/PhysRevD.89.092009

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A measurement of the parity-violating decay asymmetry parameter, αb , and the helicity amplitudes for the decay Λ 0 b →J/ψ(μ + μ − )Λ 0 (pπ − ) is reported. The analysis is based on 1400 Λ 0 b and Λ ¯ 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 Λ 0 b and Λ ¯ 0 b samples under the assumption of CP conservation, the value of α 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kruker, Tobias; Marti, Lukas; Meloni, Federico; Schneider, Basil; Sciacca, Gianfranco; Stramaglia, Maria; Stucci, Stefania Antonia and Weber, Michael

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Jan Dirk Brinksma-Albrecht

Date Deposited:

10 Jun 2015 13:54

Last Modified:

10 Jun 2015 13:54

Publisher DOI:

10.1103/PhysRevD.89.092009

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.68711

URI:

https://boris.unibe.ch/id/eprint/68711

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