A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D0 → K− K+ is performed using pp collision data, corresponding to an integrated luminosity of 3 fb^−1, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in D⁎+ → D0 π+ and D⁎− → anti-D0 π− decays. The time-integrated CP asymmetry A_CP(K− K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D0 → K− π+, D+ → K− π+ π+ and D+ → anti-K0 π+ decays used as calibration channels. It is found to be A_CP(K− K+) = (0.14 ± 0.15(stat) ± 0.10(syst))%. A combination of this result with previous LHCb measurements yields A_CP(K− K+) = (0.04 ± 0.12(stat) ± 0.10(syst))%, A_CP(π− π+) = (0.07 ± 0.14(stat) ± 0.11(syst))%. These are the most precise measurements from a single experiment. The result for A_CP(K− K+) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.

Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2017). Measurement of CP Asymmetry in D0 → K− K+ Decays. PHYSICS LETTERS. SECTION B, 767, 177-187 [10.1016/j.physletb.2017.01.061].

Measurement of CP Asymmetry in D0 → K− K+ Decays

BETTI, FEDERICO;Capriotti, L.;CARBONE, ANGELO;FERRARI, FABIO;GALLI, DOMENICO;MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZUCCHELLI, STEFANO
2017

Abstract

A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D0 → K− K+ is performed using pp collision data, corresponding to an integrated luminosity of 3 fb^−1, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in D⁎+ → D0 π+ and D⁎− → anti-D0 π− decays. The time-integrated CP asymmetry A_CP(K− K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D0 → K− π+, D+ → K− π+ π+ and D+ → anti-K0 π+ decays used as calibration channels. It is found to be A_CP(K− K+) = (0.14 ± 0.15(stat) ± 0.10(syst))%. A combination of this result with previous LHCb measurements yields A_CP(K− K+) = (0.04 ± 0.12(stat) ± 0.10(syst))%, A_CP(π− π+) = (0.07 ± 0.14(stat) ± 0.11(syst))%. These are the most precise measurements from a single experiment. The result for A_CP(K− K+) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.
2017
Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2017). Measurement of CP Asymmetry in D0 → K− K+ Decays. PHYSICS LETTERS. SECTION B, 767, 177-187 [10.1016/j.physletb.2017.01.061].
Aaij, R.; Adeva, B.; Adinolfi, M.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarez Cartelle, P.; Alv...espandi
File in questo prodotto:
File Dimensione Formato  
2017-AR-09-Meas_of_CP_Asymmetry_in_D0_to_Km_Kp_Decays-PLB.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 750.55 kB
Formato Adobe PDF
750.55 kB 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/11585/578872
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 43
  • ???jsp.display-item.citation.isi??? 27
social impact