Measurement of CP asymmetry in D-0 -> K- K+ decays

Articolo
Data di Pubblicazione:
2017
Citazione:
(2017). Measurement of CP asymmetry in D-0 -> K- K+ decays [journal article - articolo]. In PHYSICS LETTERS. SECTION B. Retrieved from https://hdl.handle.net/10446/335746
Abstract:
A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D-0 -> 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*(+) -> D-0 pi(+) and D*(-) -> (D) over bar (0)pi(-) decays. The time-integrated CP asymmetry A(CP)(K- K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D-0 -> K- pi(+), D+ -> K- pi(+) pi(+) and D+ -> (K) over bar (0)pi(+) 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)(pi(-) pi(+)) = (0.07 +/- 0.14 (stat) +/- 0.11 (syst))%. These are the most precise measurements from a single experiment. The result for ACP(K- K+) is the most precise determination of a time-integrated CPasymmetry in the charm sector to date, and neither measurement shows evidence of CPasymmetry. (C) 2017 The Author. Published by Elsevier B.V.
Tipologia CRIS:
1.1.01 Articoli/Saggi in rivista - Journal Articles/Essays
Elenco autori:
Autori di Ateneo:
Link alla scheda completa:
https://aisberg.unibg.it/handle/10446/335746
Link al Full Text:
Pubblicato in:
PHYSICS LETTERS. SECTION B
Journal