A flavor-tagged time-dependent angular analysis of the decay Bs0->PhiPhi is performed using pp collision data collected by the LHCb experiment at 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 phi_sssbar=-0.042 \pm 0.075 \pm 0.009 rad and |lambda|=1.004 \pm 0.030 \pm 0.009, respectively, assuming the same values for all polarization states of the PhiPhi 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 phisssbar=-0.074 \pm 0.069 rad and |lambda| = 1.009 \pm 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.

Precision Measurement of CP Violation in the Penguin-Mediated Decay Bs0->PhiPhi

Bassi G.
Membro del Collaboration Group
;
Kleijne N.
Membro del Collaboration Group
;
Morello M. J.
Membro del Collaboration Group
;
Pica L.
Membro del Collaboration Group
;
Ribatti R.
Membro del Collaboration Group
;
2023

Abstract

A flavor-tagged time-dependent angular analysis of the decay Bs0->PhiPhi is performed using pp collision data collected by the LHCb experiment at 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 phi_sssbar=-0.042 \pm 0.075 \pm 0.009 rad and |lambda|=1.004 \pm 0.030 \pm 0.009, respectively, assuming the same values for all polarization states of the PhiPhi 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 phisssbar=-0.074 \pm 0.069 rad and |lambda| = 1.009 \pm 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.
Precision Measurement of CP Violation in the Penguin-Mediated Decay B0s →φφ
2023
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Birds; Supersymmetry; Angular analysis; Center-of-mass energies; Centre-of-mass energies; CP violations; CP-violation parameters; Integrated luminosity; Measurements of; Polarization state; Precision measurement; Time dependent
   Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons
   UK Research and Innovation
   UKRI
   MR/W009048/1

   The study of elementary particles and their interactions (PPGPE Responsive PDRA Call 2022)
   UK Research and Innovation
   STFC
   ST/X006042/1

   The study of elementary particles and their interactions (Consolidated Grant 2022 - 2025)
   UK Research and Innovation
   STFC
   ST/W000636/1

   Experimental Particle Physics at the University of Edinburgh
   UK Research and Innovation
   STFC
   ST/X005984/1

   Application to the PPGP Experiment Responsive PDRA Call by the University of Warwick
   UK Research and Innovation
   STFC
   ST/X006018/1

   Programme of Research in Experimental Particle Physics at the University of Warwick: 2022-2025
   UK Research and Innovation
   STFC
   ST/W000571/1

   LHCb Upgrade II: Maximising HL-LHC Discovery Potential (Bridging Funding)
   UK Research and Innovation
   STFC
   ST/V003070/1
File in questo prodotto:
File Dimensione Formato  
PhysRevLett.131.171802_reduced.pdf

accesso aperto

Tipologia: Published version
Licenza: Creative Commons
Dimensione 1.38 MB
Formato Adobe PDF
1.38 MB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/153984
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 12
  • ???jsp.display-item.citation.isi??? 4
  • OpenAlex 8
social impact