Observation of the decay Λb 0 → pK μ + μ and a search for CP violation

R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, LA Everse, L. Anderlini, G. Andreassi, M. Andreotti, J.E. AndrewsR. B. Appleby, F. Archilli, P. d’Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, K. Carvalho Akiba, V. Coco, P. N.Y. David, K. De Bruyn, M. Ferro-Luzzi, T. Ketel, R. F. Koopman, J. van Leerdam, T. Li, M. Merk, C. J.G. Onderwater, G. Raven, M. Schiller, N. Serra, H. Snoek, B. Storaci, V. Syropoulos, J. van Tilburg, S. Tolk, P. Tsopelas, N. Tuning, The LHCb collaboration

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

A search for CP violation in the decay Λb 0 → pKμ+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 Λb 0 → pKμ+μ decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, (Formula Presented.)where the latter is based on asymmetries in the angle between the μ+μ and pK decay planes. These are measured to be(Formula Presented.)and no evidence for CP violation is found.[Figure not available: see fulltext.].

Original languageEnglish
Article number108
Pages (from-to)1-17
JournalJournal of High Energy Physics
Volume2017
Issue number6
DOIs
Publication statusPublished - 1 Jun 2017

Funding

FundersFunder number
Not added1681016
Science and Technology Facilities CouncilST/L001152/1, ST/N000250/1, ST/H006737/1, ST/N000331/1, GRIDPP, LHCb Upgrades, 1707993, ST/J004332/1, 1641747, ST/M003140/1, ST/K003410/1, 1708182, ST/G005974/1, LHCb
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung166208

    Keywords

    • B physics
    • CP violation
    • FCNC Interaction
    • Hadron-Hadron scattering (experiments)

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