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Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+

Author: Hennessy K.
Vorobyev V.
J. Closier
J. P. Lees
R. Garosi
Meissner M
Brook N. H.
Gao Y.
M. Gandelman
Wiggers L
Lees J.-P.
Gys T
Fardell G.
Hutchcroft D.
Lohn S
Powell A.
Bedeschi F.
Martin Sanchez A.
Gaspar C
Smith E.
P. Krokovny
C. Pavel Nicorescu
Mous I
Ketel T.
Cowan G.A.
Ekelhof R.
Ferro-Luzzi M.
Tisserand V
Golubkov D.
Martinelli M. AA
Koopman RF
Wislicki W
Punzi G
Panman J.
Lopez-March N.
37 Sannino Mario 19 71 Santacesaria Roberta 24 Rios CS
Jawahery A.
25 Poluektov A
Bozzi C.
Perret P
Campora Perez D.
Couturier B
A. P. Yzquierdo
Sanninoi M
Giubega L.
Barter W
Gibson V.
36 Gaspar C
R. Matev
Sokoloff M.D.
Blouw J
Golubkov D
Corti G.
Owen P.
Sokoloff M.D.
Lacarrere D
C. Parkinson
P. Koppenburg
Perez DC
A. Davis
Nguyen-Mau C.
Plackett R.
F. Ruffini
T. Nikodem
61 Gui B
Andrews J. E.
2 Casse G
S. C. Haines
M. Merk
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N. Sagidova
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dos Reis A.C.
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Matev R
G. Ciezarek
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Appleby RB
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I. Komarov
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P. Hopchev
H. Luo
Idzik M
Tonelli D.
B. S. Sedes
Cardini A
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Publication venue
Publication date: 01/01/2013
Field of study

An analysis of B+ → K0 Sπ+ and B+ → K0 S K+ decays is performed with the LHCb experiment. The pp collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass energies of √ s = 7 TeV and √ s = 8 TeV, respectively. The ratio of branching fractions and the direct CP asymmetries are measured to be B(B+ → K0 S K+ )/B(B+ → K0 Sπ+ ) = 0.064 ± 0.009 (stat.) ± 0.004 (syst.), ACP(B+ → K0 Sπ+ ) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0 S K+ ) = −0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at √ s = 7 TeV is used to search for B+ c → K0 S K+ decays and results in the upper limit ( fc · B(B+ c → K0 S K+ ))/( fu · B(B+ → K0 Sπ+ )) < 5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b quark into a B+ c or a B+ meson, respectively

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