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

Bonivento W;Bursche A;Chen S;Dettori F;Manca G;Oldeman R;Saitta B;
2017-01-01

Abstract

A search for CP violation in the decay Λ0b → 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 Λ0b → pK − μ + μ − decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, ΔACP≡ACP(Λ0b→pK−μ+μ−)−ACP(Λ0b→pK−J/ψ)ΔACP≡ACP(Λb0→pK−μ+μ−)−ACP(Λb0→pK−J/ψ) and a aTˆ-oddCPaCPT^-odd, where the latter is based on asymmetries in the angle between the μ + μ − and pK − decay planes. These are measured to be ΔACP=(−3.5±5.0(stat)±0.2(syst))×10−2,aTˆ-oddCP=(1.2±5.0(stat)±0.7(syst))×10−2,ΔACP=(−3.5±5.0(stat)±0.2(syst))×10−2,aCPT^-odd=(1.2±5.0(stat)±0.7(syst))×10−2, and no evidence for CP violation is found.
2017
Inglese
JOURNAL OF HIGH ENERGY PHYSICS
2017
6
108 (2017)
WOS:000404625300001
2-s2.0-85021447249
https://link.springer.com/article/10.1007/JHEP06(2017)108
Esperti anonimi
internazionale
scientifica
sì
Aaij, R; Adeva, B; Adinolfi, M; Ajaltouni, Z; Akar, S; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; Alves, Aa; Ama ...espandi
1.1 Articolo in rivista
info:eu-repo/semantics/article
1 Contributo su Rivista::1.1 Articolo in rivista
262
765
open
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