Search for CP violation in Λb0→pK− and Λb0→pπ− decays

Aaij, R.; Adeva, B.; Adinolfi, M.; Aidala, C.A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.; Ali, S.; Alkhazov, G.; Alvarez Cartelle, P.; Alves, A.A.; Amato, S.; Amerio, S.; Amhis, Y.; An, L.; Anderlini, L.; LHCb Collaboration

doi:10.1016/j.physletb.2018.10.039

Published December 2018 | Version v1

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Search for CP violation in Λb0→pK− and Λb0→pπ− decays

1. Nikhef National Institute for Subatomic Physics, Amsterdam (Netherlands)
2. Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela (Spain)
3. H.H. Wills Physics Laboratory, University of Bristol, Bristol (United Kingdom)
4. University of Michigan, Ann Arbor (United States)
5. Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand (France)
6. University of Cincinnati, Cincinnati, OH (United States)
7. INFN Laboratori Nazionali di Frascati, Frascati (Italy)
8. Fakultät Physik, Technische Universität Dortmund, Dortmund (Germany)
9. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
10. School of Physics and Astronomy, University of Glasgow, Glasgow (United Kingdom)
11. ICCUB, Universitat de Barcelona, Barcelona (Spain)
12. Petersburg Nuclear Physics Institute (PNPI), Gatchina (Russian Federation)
13. Imperial College London, London (United Kingdom)
14. Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro (Brazil)
15. INFN Sezione di Padova, Padova (Italy)
16. LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay (France)
17. Center for High Energy Physics, Tsinghua University, Beijing (China)
18. INFN Sezione di Firenze, Firenze (Italy)

A search for CP violation in $Λ_{b}^{0} \to p K^{-}$ and $Λ_{b}^{0} \to p π^{-}$ decays is presented using a sample of pp collisions collected with the LHCb detector and corresponding to an integrated luminosity of 3.0 ${fb}^{- 1}$ . The CP -violating asymmetries are measured to be $A_{CP}^{p K^{-}} = - 0.020 \pm 0.013 \pm 0.019$ and $A_{CP}^{p π^{-}} = - 0.035 \pm 0.017 \pm 0.020$ , and their difference $A_{CP}^{p K^{-}} - A_{CP}^{p π^{-}} = 0.014 \pm 0.022 \pm 0.010$ , where the first uncertainties are statistical and the second systematic. These are the most precise measurements of such asymmetries to date.

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Available from http://dx.doi.org/10.1016/j.physletb.2018.10.039

Additional details

DOI: 10.1016/j.physletb.2018.10.039;
arXiv: arXiv:1807.06544v2;
PII: S0370269318308104;

Journal Title: Physics Letters. Section B
Journal Volume: 787
Journal Page Range: p. 124-133
ISSN: 0370-2693
CODEN: PYLBAJ

Country of Publication: Netherlands
Country of Input or Organization: International Atomic Energy Agency (IAEA)
INIS RN: 51015344
Subject category: S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI: ASYMMETRY; CP INVARIANCE; KAONS MINUS; LAMBDA B NEUTRAL BARYONS; LHCB DETECTOR; LUMINOSITY; PAIR PRODUCTION; PARTICLE DECAY; PIONS MINUS; PROTON-PROTON INTERACTIONS; PROTONS
Descriptors DEC: BARYON-BARYON INTERACTIONS; BARYONS; BEAUTY BARYONS; BEAUTY PARTICLES; BOSONS; DECAY; ELEMENTARY PARTICLES; FERMIONS; HADRON-HADRON INTERACTIONS; HADRONS; INTERACTIONS; INVARIANCE PRINCIPLES; KAONS; MEASURING INSTRUMENTS; MESONS; NUCLEON-NUCLEON INTERACTIONS; NUCLEONS; OPTICAL PROPERTIES; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PHYSICAL PROPERTIES; PIONS; PROTON-NUCLEON INTERACTIONS; PSEUDOSCALAR MESONS; RADIATION DETECTORS; STRANGE MESONS; STRANGE PARTICLES

Collaborations: LHCb Collaboration

Search for CP violation in Λb0→pK− and Λb0→pπ− decays

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Search for CP violation in Λb0→pK− and Λb0→pπ− decays

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