We report measurements of charm-mixing parameters based on the decay-time-dependent ratio of D0 → K+ π− to D0 → K− π+ rates. The analysis uses a data sample of proton-proton collisions corresponding to an integrated luminosity of 5.0 fb^−1 recorded by the LHCb experiment from 2011 through 2016. Assuming charge-parity (CP) symmetry, the mixing parameters are determined to be x'^2 = (3.9 ± 2.7) × 10^−5, y′ = (5.28 ± 0.52) × 10^−3, and R_D = (3.454 ± 0.031) × 10^−3. Without this assumption, the measurement is performed separately for D0 and anti-D0 mesons, yielding a direct CP-violating asymmetry A_D = (−0.1 ± 9.1) × 10^−3, and magnitude of the ratio of mixing parameters 1.00 < |q/p| < 1.35 at the 68.3% confidence level. All results include statistical and systematic uncertainties and improve significantly upon previous single-measurement determinations. No evidence for CP violation in charm mixing is observed.

Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2018). Updated Determination of D0–anti-D0 Mixing and CP Violation Parameters with D0 → K+ π− Decays. PHYSICAL REVIEW D, 97(3), 1-11 [10.1103/PhysRevD.97.031101].

Updated Determination of D0–anti-D0 Mixing and CP Violation Parameters with D0 → K+ π− Decays

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Marconi, U.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2018

Abstract

We report measurements of charm-mixing parameters based on the decay-time-dependent ratio of D0 → K+ π− to D0 → K− π+ rates. The analysis uses a data sample of proton-proton collisions corresponding to an integrated luminosity of 5.0 fb^−1 recorded by the LHCb experiment from 2011 through 2016. Assuming charge-parity (CP) symmetry, the mixing parameters are determined to be x'^2 = (3.9 ± 2.7) × 10^−5, y′ = (5.28 ± 0.52) × 10^−3, and R_D = (3.454 ± 0.031) × 10^−3. Without this assumption, the measurement is performed separately for D0 and anti-D0 mesons, yielding a direct CP-violating asymmetry A_D = (−0.1 ± 9.1) × 10^−3, and magnitude of the ratio of mixing parameters 1.00 < |q/p| < 1.35 at the 68.3% confidence level. All results include statistical and systematic uncertainties and improve significantly upon previous single-measurement determinations. No evidence for CP violation in charm mixing is observed.
2018
Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2018). Updated Determination of D0–anti-D0 Mixing and CP Violation Parameters with D0 → K+ π− Decays. PHYSICAL REVIEW D, 97(3), 1-11 [10.1103/PhysRevD.97.031101].
Aaij, R.; Adeva, B.; Adinolfi, M.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.; Ali, S.; Alkhazov, G.; Alvar...espandi
File in questo prodotto:
Eventuali allegati, non sono esposti

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/11585/627920
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 33
  • ???jsp.display-item.citation.isi??? 25
social impact