The CKM angle γ is measured for the first time from mixing-induced CP violation between Bs0→Ds∓K±π±π∓ and B¯s0→Ds±K∓π∓π± decays reconstructed in proton-proton collision data corresponding to an integrated luminosity of 9 fb−1 recorded with the LHCb detector. A time-dependent amplitude analysis is performed to extract the CP-violating weak phase γ − 2βs and, subsequently, γ by taking the Bs0‐B¯s0 mixing phase βs as an external input. The measurement yields γ = (44 ± 12)° modulo 180°, where statistical and systematic uncertainties are combined. An alternative model-independent measurement, integrating over the five-dimensional phase space of the decay, yields γ=(44−13+20)° modulo 180°. Moreover, the Bs0‐B¯s0 oscillation frequency is measured from the flavour-specific control channel Bs0→Ds−π+π+π− to be ∆ms = (17.757 ± 0.007(stat) ± 0.008(syst)) ps−1, consistent with and more precise than the current world-average value. [Figure not available: see fulltext.]

Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Measurement of the CKM angle γ and Bs0‐B¯s0 mixing frequency with Bs0→Ds∓h±π±π∓ decays. JOURNAL OF HIGH ENERGY PHYSICS, 2021(3) [10.1007/JHEP03(2021)137].

Measurement of the CKM angle γ and Bs0‐B¯s0 mixing frequency with Bs0→Ds∓h±π±π∓ decays

Borsato M.;Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Gotti C.;Martinazzoli L.;Martinelli M.;Meloni S.;Petruzzo M.;
2021

Abstract

The CKM angle γ is measured for the first time from mixing-induced CP violation between Bs0→Ds∓K±π±π∓ and B¯s0→Ds±K∓π∓π± decays reconstructed in proton-proton collision data corresponding to an integrated luminosity of 9 fb−1 recorded with the LHCb detector. A time-dependent amplitude analysis is performed to extract the CP-violating weak phase γ − 2βs and, subsequently, γ by taking the Bs0‐B¯s0 mixing phase βs as an external input. The measurement yields γ = (44 ± 12)° modulo 180°, where statistical and systematic uncertainties are combined. An alternative model-independent measurement, integrating over the five-dimensional phase space of the decay, yields γ=(44−13+20)° modulo 180°. Moreover, the Bs0‐B¯s0 oscillation frequency is measured from the flavour-specific control channel Bs0→Ds−π+π+π− to be ∆ms = (17.757 ± 0.007(stat) ± 0.008(syst)) ps−1, consistent with and more precise than the current world-average value. [Figure not available: see fulltext.]
Articolo in rivista - Articolo scientifico
B physics; CKM angle gamma; CP violation; Hadron-Hadron scattering (experiments); Oscillation;
English
2021
2021
3
137
none
Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Measurement of the CKM angle γ and Bs0‐B¯s0 mixing frequency with Bs0→Ds∓h±π±π∓ decays. JOURNAL OF HIGH ENERGY PHYSICS, 2021(3) [10.1007/JHEP03(2021)137].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

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/10281/310185
Citazioni
  • Scopus 15
  • ???jsp.display-item.citation.isi??? 5
Social impact