Measurement of the ratio of branching fractions and difference in CP asymmetries of the decays B+→J/ψπ+ and B+→J/ψK+
R. Aaij
,
L. Beaucourt
(1)
,
M. Chefdeville
(1)
,
D. Decamp
(1)
,
N. Déléage
(1)
,
P. Ghez
(1)
,
J.-F. Marchand
(1)
,
M.-N. Minard
(1)
,
B. Pietrzyk
(1)
,
S. t'Jampens
(1)
,
V. Tisserand
(1)
,
E. Tournefier
(1)
,
J. Arnau Romeu
(2)
,
E. Aslanides
(2)
,
J. Cogan
(2)
,
K. De Bruyn
(2)
,
R. Legac
(2)
,
O. Leroy
(2)
,
G. Mancinelli
(2)
,
M. Martin
(2)
,
J. Serrano
(2)
,
A. Tayduganov
(2)
,
A. Tsaregorodtsev
(2)
R. Aaij
- Fonction : Auteur
M. Chefdeville
- Fonction : Auteur
- PersonId : 741874
- IdHAL : maximilien-chefdeville
- ORCID : 0000-0002-6553-6493
S. t'Jampens
- Fonction : Auteur
- PersonId : 736045
- IdHAL : stephane-tjampens
- ORCID : 0000-0003-4249-6641
J. Cogan
- Fonction : Auteur
- PersonId : 750510
- IdHAL : julien-cogan
- ORCID : 0000-0001-7194-7566
- IdRef : 078779014
O. Leroy
- Fonction : Auteur
- PersonId : 171866
- IdHAL : olivier-leroy
- ORCID : 0000-0002-2589-240X
- IdRef : 169871835
J. Serrano
- Fonction : Auteur
- PersonId : 175327
- IdHAL : justine-serrano
- ORCID : 0000-0003-2489-7812
- IdRef : 127525521
Résumé
The ratio of branching fractions and the difference in CP asymmetries of the decays B+→J/ψπ+ and B+→J/ψK+ are measured using a data sample of pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1 at centre-of-mass energies of 7 and 8 TeV. The results are
B(B+→J/ψπ+)B(B+→J/ψK+)=(3.83±0.03±0.03)×10−2,
ACP(B+→J/ψπ+)−ACP(B+→J/ψK+)=(1.82±0.86±0.14)×10−2,
where the first uncertainties are statistical and the second are systematic. Combining this result with a recent LHCb measurement of ACP(B+→J/ψK+) provides the most precise estimate to date of CP violation in the decay B+→J/ψπ+,
ACP(B+→J/ψπ+)=(1.91±0.89±0.16)×10−2.