First observation of the decay $B_s^0 \rightarrow \phi \bar{K}^{*0}$

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

doi:10.1007/JHEP11(2013)092

First observation of the decay $B_s^0 \rightarrow \phi \bar{K}^{*0}$

LHCb

Collaboration

Jun 10, 2013

22 pages

Published in:

JHEP 11 (2013) 092

Published: Nov 12, 2013

e-Print:

1306.2239 [hep-ex]

DOI:

10.1007/JHEP11(2013)092

PDG:

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

\rightarrow

{{\mathit \phi}}{{\mathit K}^{*}{(892)}^{0}}

Report number:

LHCB-PAPER-2013-012,
CERN-PH-EP-2013-087

Experiments:

CERN-LHC-LHCb

View in:

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reference search29 citations

Citations per year

Abstract: (arXiv)

The first observation of the decay

B_s^0 \rightarrow \phi \bar{K}^{*0}

is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb

^{-1}

of

pp

collisions at

\sqrt{s} = 7 TeV

, collected with the LHCb detector. A yield of

30 \pm 6

B_s^0 \rightarrow (K^+K^-)(K^-\pi^+)

decays is found in the mass windows

1012.5 < M(K^+K^-) < 1026.5 MeV/c^2

and

746 < M(K^-\pi^+)< 1046 MeV/c^2

. The signal yield is found to be dominated by

B_s^0 \rightarrow \phi \bar{K}^{*0}

decays, and the corresponding branching fraction is measured to be

{\cal B}(B_s^0 \rightarrow \phi \bar{K}^{*0}) = (1.10 \pm 0.24 (stat) \pm 0.14 (syst) \pm 0.08 (f_d/f_s)) \times 10^{-6}

, where the uncertainties are statistical, systematic and from the ratio of fragmentation fractions

f_d/f_s

which accounts for the different production rate of

B^0

and

B_s^0

mesons. The significance of

B_s^0 \rightarrow \phi \bar{K}^{*0}

signal is 6.1 standard deviations. The fraction of longitudinal polarization in

B_s^0 \rightarrow \phi \bar{K}^{*0}

decays is found to be

f_0 = 0.51 \pm 0.15 (stat) \pm 0.07 (syst)

.

B physics
Flavour Changing Neutral Currents
Flavor physics
Hadron-Hadron Scattering
B/s0: hadronic decay
B/s0: branching ratio: measured
polarization: longitudinal
p p: scattering
bottom: fragmentation
LHC-B

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First observation of the decay Bs0→ϕKˉ∗0B_s^0 \rightarrow \phi \bar{K}^{*0}Bs0​→ϕKˉ∗0

Citations per year

First observation of the decay $B_s^0 \rightarrow \phi \bar{K}^{*0}$