Measurement of the CKM angle γ using B0→DK∗0 with D→K0Sπ+π− decays
R. Aaij
,
L. Beaucourt
(1)
,
M. Chefdeville
(1)
,
D. Decamp
(1)
,
N. Déléage
(1)
,
P. Ghez
(1)
,
J.-P. Lees
(1)
,
J.-F. Marchand
(1)
,
M.-N. Minard
(1)
,
B. Pietrzyk
(1)
,
S. t'Jampens
(1)
,
V. Tisserand
(1)
,
E. Tournefier
(1)
,
Z.J. Ajaltouni
(2)
,
M. Baalouch
(2)
,
E. Cogneras
(2)
,
O. Deschamps
(2)
,
I. El Rifai
(2)
,
G. Gazzoni
(2)
,
M. Grabalosa Gándara
(2)
,
P. Henrard
(2)
,
M. Hoballah
(2)
,
M. Kozeiha
(2)
,
R. Lefèvre
(2)
,
J. Maratas
(2)
,
S. Monteil
(2)
,
V. Niess
(2)
,
P. Perret
(2)
,
S. Akar
(3)
,
E. Aslanides
(3)
,
J. Cogan
(3)
,
K. De Bruyn
(3)
,
W. Kanso
(3)
,
R. Legac
(3)
,
O. Leroy
(4)
,
G. Mancinelli
(3)
,
M. Martin
(3)
,
A. Mordà
(3)
,
J. Serrano
(3)
,
A. Tayduganov
(3)
,
A. Tsaregorodtsev
(3)
R. Aaij
- Function : Author
M. Chefdeville
- Function : Author
- PersonId : 741874
- IdHAL : maximilien-chefdeville
- ORCID : 0000-0002-6553-6493
S. t'Jampens
- Function : Author
- PersonId : 736045
- IdHAL : stephane-tjampens
- ORCID : 0000-0003-4249-6641
E. Cogneras
- Function : Author
- PersonId : 743220
- IdHAL : eric-cogneras
- ORCID : 0000-0002-8933-9427
O. Deschamps
- Function : Author
- PersonId : 12089
- IdHAL : olivier-deschamps
- ORCID : 0000-0002-7047-6042
- IdRef : 161447368
M. Hoballah
- Function : Author
- PersonId : 1174785
- IdHAL : mostafa-adam-hoballah-hobart
P. Perret
- Function : Author
- PersonId : 739797
- IdHAL : pascal-perret
- ORCID : 0000-0002-5732-4343
J. Cogan
- Function : Author
- PersonId : 750510
- IdHAL : julien-cogan
- ORCID : 0000-0001-7194-7566
- IdRef : 078779014
O. Leroy
- Function : Author
- PersonId : 171866
- IdHAL : olivier-leroy
- ORCID : 0000-0002-2589-240X
- IdRef : 169871835
J. Serrano
- Function : Author
- PersonId : 175327
- IdHAL : justine-serrano
- ORCID : 0000-0003-2489-7812
- IdRef : 127525521
Abstract
A model-dependent amplitude analysis of the decay B0→D(K0Sπ+π−)K∗0 is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0fb−1, recorded at s√=7 and 8TeV by the LHCb experiment. The CP violation observables x± and y±, sensitive to the CKM angle γ, are measured to be
x−=−0.15±0.14±0.03±0.01,y−=0.25±0.15±0.06±0.01,x+=0.05±0.24±0.04±0.01,y+=−0.65+0.24−0.23±0.08±0.01,
where the first uncertainties are statistical, the second systematic and the third arise from the uncertainty on the D→K0Sπ+π− amplitude model. These are the most precise measurements of these observables. They correspond to γ=(80+21−22)∘ and rB0=0.39±0.13, where rB0 is the magnitude of the ratio of the suppressed and favoured B0→DK+π− decay amplitudes, in a Kπ mass region of ±50MeV around the K∗(892)0 mass and for an absolute value of the cosine of the K∗0 decay angle larger than 0.4.