Measurement of the $B^0_s \rightarrow J/\psi \bar{K}^{*0}$ branching fraction and angular amplitudes

Aaij, R; Abellan Beteta, C; Adametz, A; Adeva, B; Adinolfi, M; Adrover, C; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F

doi:10.1103/PhysRevD.86.071102

Measurement of the $B^0_s \rightarrow J/\psi \bar{K}^{*0}$ branching fraction and angular amplitudes

LHCb

Collaboration

Aug, 2012

16 pages

Published in:

Phys.Rev.D 86 (2012) 071102

Published: Oct 8, 2012

e-Print:

1208.0738 [hep-ex]

DOI:

10.1103/PhysRevD.86.071102

PDG:

{{\mathit B}_{{{s}}}^{0}}

\rightarrow

{{\mathit J / \psi}{(1S)}}{{\overline{\mathit K}}^{*}{(892)}^{0}}

Report number:

CERN-PH-EP-2012-214,
LHCB-PAPER-2012-014

Experiments:

CERN-LHC-LHCb

View in:

pdf

reference search45 citations

Citations per year

Abstract:

A sample of 114±11

B_s^0 → J/ψK^-π^+

signal events obtained with 0.37 fb

^{-1}

of pp collisions at √s=7 TeV collected by the LHCb experiment is used to measure the branching fraction and polarization amplitudes of the B_s^0 → J/ψK̅ ^{*0} decay, with K̅ ^{*0} → K^-π^+. The

K^-π^+

mass spectrum of the candidates in the

B_s^0

peak is dominated by the K̅ ^{*0} contribution. Subtracting the nonresonant

K^-π^+

component, the branching fraction of B_s^0 → J/ψK̅ ^{*0} is

(4.4_{-0.4}^{+0.5}±0.8)×10^{-5}

, where the first uncertainty is statistical and the second is systematic. A fit to the angular distribution of the decay products yields the

K^{*0}

polarization fractions

f_L=0.50±0.08±0.02

and

f_{∥}=0.19_{-0.08}^{+0.10}±0.02

.

13.88.+e
13.25.Hw
14.40.Nd
decay: angular distribution
p p: scattering
B/s0: branching ratio: measured
K*(892)0: polarization
LHC-B
B/s0: hadronic decay
mass spectrum: (K- pi+)

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Measurement of the Bs0→J/ψKˉ∗0B^0_s \rightarrow J/\psi \bar{K}^{*0}Bs0​→J/ψKˉ∗0 branching fraction and angular amplitudes

Citations per year

Angular analysis of B0 s → J/ψφ and B → J/ψK∗ decays and measurement of ∆Γs and φs

Measurement of the $B^0_s \rightarrow J/\psi \bar{K}^{*0}$ branching fraction and angular amplitudes