Abstract
A flavor-tagged time-dependent angular analysis of the decay B0s→ϕϕ is performed using pp collision data collected by the LHCb experiment at s√=13 TeV, the center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb^{-1}. The CP-violating phase and direct CP-violation parameter are measured to be ϕss¯s=−0.042±0.075±0.009 rad and |λ|=1.004±0.030±0.009, respectively, assuming the same values for all polarization states of the ϕϕ system. In these results, the first uncertainties are statistical and the second systematic. These parameters are also determined separately for each polarization state, showing no evidence for polarization dependence. The results are combined with previous LHCb measurements using pp collisions at center-of-mass energies of 7 and 8 TeV, yielding ϕss¯s=−0.074±0.069 rad and |λ|=1.009±0.030. This is the most precise study of time-dependent CP violation in a penguin-dominated B meson decay. The results are consistent with CP symmetry and with the Standard Model predictions.
Original language | English |
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Article number | 171802 |
Number of pages | 12 |
Journal | Physical Review Letters |
Volume | 131 |
DOIs | |
Publication status | Published - 23 Oct 2023 |
Bibliographical note
We express our gratitude to our colleagues in the CERNaccelerator departments for the excellent performance of the
LHC. We thank the technical and administrative staff at the
LHCb institutes. We acknowledge support from CERN and
from the national agencies: CAPES, CNPq, FAPERJ, and
FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3
(France); BMBF, DFG, and MPG (Germany); INFN (Italy);
NWO (Netherlands);MNiSWand NCN (Poland);MCID/IFA
(Romania); MICINN (Spain); SNSF and SER (Switzerland);
NASU (Ukraine); STFC (United Kingdom); DOE NP and
NSF (USA). We acknowledge the computing resources that
are provided by CERN, IN2P3 (France), KIT and DESY
(Germany), INFN (Italy), SURF (Netherlands), PIC (Spain),
GridPP (United Kingdom), CSCS (Switzerland), IFIN-HH
(Romania), CBPF (Brazil), Polish WLCG (Poland), and
NERSC (USA). We are indebted to the communities behind
the multiple open-source software packages on which we
depend. Individual groups or members have received support
from ARC and ARDC (Australia); Minciencias (Colombia);
AvH Foundation (Germany); EPLANET,Marie SkłodowskaCurie Actions, ERC and NextGenerationEU (European
Union); A*MIDEX, ANR, IPhU and Labex P2IO, and
R´egion Auvergne-Rhóne-Alpes (France); Key Research
Program of Frontier Sciences of CAS, CAS PIFI, CAS
CCEPP, Fundamental Research Funds for the Central
Universities, and Science and Tech. Program of
Guangzhou (China); GVA, XuntaGal, GENCAT, Inditex,
InTalent and Prog. Atracción Talento, CM (Spain); SRC
(Sweden);the Leverhulme Trust,theRoyal Society and UKRI
(United Kingdom).