A search for CP violation in the decay Λ b 0  → pK − μ + μ − is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The Λ b 0  → pK − μ + μ − decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, Δ≡(Λ0→−+−)−(Λ0→−/) and a ˆ- , where the latter is based on asymmetries in the angle between the μ + μ − and pK − decay planes. These are measured to be Δ=(−3.5±5.0(stat)±0.2(syst))×10−2,ˆ-=(1.2±5.0(stat)±0.7(syst))×10−2, and no evidence for CP violation is found

Observation of the decay Λb0→ pK−μ+μ−and a search for CP violation / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2017:6(2017). [10.1007/JHEP06(2017)108]

Observation of the decay Λb0→ pK−μ+μ−and a search for CP violation

Capriotti, L.;Casse, G.;Sarti, A.;Sciubba, A.;
2017

Abstract

A search for CP violation in the decay Λ b 0  → pK − μ + μ − is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The Λ b 0  → pK − μ + μ − decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, Δ≡(Λ0→−+−)−(Λ0→−/) and a ˆ- , where the latter is based on asymmetries in the angle between the μ + μ − and pK − decay planes. These are measured to be Δ=(−3.5±5.0(stat)±0.2(syst))×10−2,ˆ-=(1.2±5.0(stat)±0.7(syst))×10−2, and no evidence for CP violation is found
2017
B physics, CP violation, FCNC Interaction, Hadron-Hadron scattering (experiments)
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of the decay Λb0→ pK−μ+μ−and a search for CP violation / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2017:6(2017). [10.1007/JHEP06(2017)108]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1074689
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