TY - JOUR
T1 - First Evidence for Direct CP Violation in Beauty to Charmonium Decays
AU - Aaij, R
AU - Abdelmotteleb, A S W
AU - Abellan Beteta, C
AU - Abudinén, F
AU - Ackernley, T
AU - Adefisoye, A A
AU - Adeva, B
AU - Adinolfi, M
AU - Adlarson, P
AU - Agapopoulou, C
AU - Aidala, C A
AU - Ajaltouni, Z
AU - Akar, S
AU - Akiba, K
AU - Albicocco, P
AU - Albrecht, J
AU - Alessio, F
AU - Alexander, M
AU - Aliouche, Z
AU - Alvarez Cartelle, P
AU - Amalric, R
AU - Amato, S
AU - Amey, J L
AU - Amhis, Y
AU - An, L
AU - Anderlini, L
AU - Andersson, M
AU - Andreianov, A
AU - Andreola, P
AU - Andreotti, M
AU - Andreou, D
AU - Anelli, A
AU - Ao, D
AU - Archilli, F
AU - Argenton, M
AU - Arguedas Cuendis, S
AU - Artamonov, A
AU - Artuso, M
AU - Aslanides, E
AU - Ataíde Da Silva, R
AU - Atzeni, M
AU - Audurier, B
AU - Bacher, D
AU - Bachiller Perea, I
AU - Bachmann, S
AU - Bachmayer, M
AU - Back, J J
AU - Baladron Rodriguez, P
AU - Balagura, V
AU - Balboni, A
AU - LHCb collaboration
AU - da silva Bolognani, Carolina
AU - Cámpora Pérez, Daniel Hugo
AU - Chiotopoulos, Xenofon
AU - de Vries, Jacco
AU - Lucio Martinez, Miriam
AU - Merk, Marcel
AU - Nicotra, Davide
AU - Onderwater, Gerco
AU - Pawley, Chris
AU - Vos, Keri
PY - 2025/3/14
Y1 - 2025/3/14
N2 - The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+→J/ψπ+ are precisely measured relative to the favored decay B+→J/ψK+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are ΔACPACP(B+→J/ψπ+)-ACP(B+→J/ψK+)=(1.29±0.49±0.08)×10-2, Rπ/K[B(B+→J/ψπ+)/B(B+→J/ψK+)]=(3.852±0.022±0.018)×10-2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields ΔACP=(1.42±0.43±0.08)×10-2 and Rπ/K=(3.846±0.018±0.018)×10-2. The combined ΔACP value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.
AB - The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+→J/ψπ+ are precisely measured relative to the favored decay B+→J/ψK+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are ΔACPACP(B+→J/ψπ+)-ACP(B+→J/ψK+)=(1.29±0.49±0.08)×10-2, Rπ/K[B(B+→J/ψπ+)/B(B+→J/ψK+)]=(3.852±0.022±0.018)×10-2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields ΔACP=(1.42±0.43±0.08)×10-2 and Rπ/K=(3.846±0.018±0.018)×10-2. The combined ΔACP value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.
KW - ASYMMETRY
U2 - 10.1103/PhysRevLett.134.101801
DO - 10.1103/PhysRevLett.134.101801
M3 - Article
SN - 0031-9007
VL - 134
JO - Physical Review Letters
JF - Physical Review Letters
IS - 10
M1 - 101801
ER -