A study of charm mixing and CP violation in D0 → K± π∓ π± π∓ decays is performed using data collected by the LHCb experiment in proton-proton collisions from 2015 to 2018, corresponding to an integrated luminosity of 6 fb^−1. The ratio of promptly produced D0 → K+ π− π+ π− to D0 → K− π+ π− π+ decay rates is measured as a function of D0 decay time, both inclusive over phase space and in bins of phase space. Taking external inputs for the D0 anti-D0 mixing parameters x and y allows constraints to be obtained on the hadronic parameters of the charm decay. When combined with previous measurements from charm-threshold experiments and at LHCb, improved knowledge is obtained for these parameters, which is valuable for studies of the angle γ of the Unitarity Triangle. An alternative analysis is also performed, in which external inputs are taken for the hadronic parameters, and the mixing parameters are determined, including Δx and Δy, which are nonzero in the presence of CP violation. It is found that x = (0.85{−0.24}{+0.15})%, y = (0.21{−0.27}{+0.29})%, Δx = (−0.02 ± 0.04)% and Δy = (0.02{−0.03}{+0.04})%. These results are consistent with previous measurements and the hypothesis of CP conservation.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Study of charm mixing and CP violation with D0 → K± π∓ π± π∓ decays. JOURNAL OF HIGH ENERGY PHYSICS, 2025(12), 0-38 [10.1007/jhep12(2025)153].

Study of charm mixing and CP violation with D0 → K± π∓ π± π∓ decays

Bellavista, A.;Caporale, M.;Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Zenesini, F.;
2025

Abstract

A study of charm mixing and CP violation in D0 → K± π∓ π± π∓ decays is performed using data collected by the LHCb experiment in proton-proton collisions from 2015 to 2018, corresponding to an integrated luminosity of 6 fb^−1. The ratio of promptly produced D0 → K+ π− π+ π− to D0 → K− π+ π− π+ decay rates is measured as a function of D0 decay time, both inclusive over phase space and in bins of phase space. Taking external inputs for the D0 anti-D0 mixing parameters x and y allows constraints to be obtained on the hadronic parameters of the charm decay. When combined with previous measurements from charm-threshold experiments and at LHCb, improved knowledge is obtained for these parameters, which is valuable for studies of the angle γ of the Unitarity Triangle. An alternative analysis is also performed, in which external inputs are taken for the hadronic parameters, and the mixing parameters are determined, including Δx and Δy, which are nonzero in the presence of CP violation. It is found that x = (0.85{−0.24}{+0.15})%, y = (0.21{−0.27}{+0.29})%, Δx = (−0.02 ± 0.04)% and Δy = (0.02{−0.03}{+0.04})%. These results are consistent with previous measurements and the hypothesis of CP conservation.
2025
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Study of charm mixing and CP violation with D0 → K± π∓ π± π∓ decays. JOURNAL OF HIGH ENERGY PHYSICS, 2025(12), 0-38 [10.1007/jhep12(2025)153].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoul...espandi
File in questo prodotto:
File Dimensione Formato  
2025-AR-62-Study_of_Charm_Mixing_and_CPV_with_D0-JHEP.pdf

accesso aperto

Tipo: Versione (PDF) editoriale / Version Of Record
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 1.15 MB
Formato Adobe PDF
1.15 MB Adobe PDF Visualizza/Apri

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/11585/1036892
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
  • OpenAlex ND
social impact