A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λ0 b → J=ψðμþμ−ÞΛ0ðpπ−Þ is reported. The analysis is based on 1400 Λ0 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 Λ0 b and Λ¯ 0 b samples under the assumption of CP conservation, the value of αb is measured to be 0.30 0.16ðstatÞ 0.06ðsystÞ. This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory

Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., et al. (2014). Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λb0 →J /ψ Λ0 with the ATLAS detector. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 89(9), 092009-1-092009-25 [10.1103/PhysRevD.89.092009].

Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λb0 →J /ψ Λ0 with the ATLAS detector

BELLAGAMBA, LORENZO;BRUNI, ALESSIA;BRUNI, GRAZIANO;DE CASTRO, STEFANO;FABBRI, LAURA;FRANCHINI, MATTEO;GIACOBBE, BENEDETTO;GIORGI, FILIPPO MARIA;MENGARELLI, ALBERTO;PICCININI, MAURIZIO;RINALDI, LORENZO;ROMANO, MARINO;SBARRA, CARLA;SEMPRINI CESARI, NICOLA;SPIGHI, ROBERTO;VALENTINETTI, SARA;VILLA, MAURO;ZOCCOLI, ANTONIO;
2014

Abstract

A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λ0 b → J=ψðμþμ−ÞΛ0ðpπ−Þ is reported. The analysis is based on 1400 Λ0 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 Λ0 b and Λ¯ 0 b samples under the assumption of CP conservation, the value of αb is measured to be 0.30 0.16ðstatÞ 0.06ðsystÞ. This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory
2014
Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., et al. (2014). Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λb0 →J /ψ Λ0 with the ATLAS detector. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 89(9), 092009-1-092009-25 [10.1103/PhysRevD.89.092009].
Aad, G.; Abajyan, T.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; Abouzeid, O.S.; Abramowicz, H.; Abreu, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/520907
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