Measurement of the CKM angle $\gamma$ using $B^0 \rightarrow D K^{*0}$ with $D \rightarrow K^0_S \pi^+ \pi^-$ decays - INSPIRE

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Measurement of the CKM angle $\gamma$ using $B^0 \rightarrow D K^{*0}$ with $D \rightarrow K^0_S \pi^+ \pi^-$ decays

LHCb

Collaboration

May 3, 2016

32 pages

Published in:

JHEP 08 (2016) 137

Published: Aug 24, 2016

e-Print:

1605.01082 [hep-ex]

DOI:

10.1007/JHEP08(2016)137

PDG:

\gamma

Report number:

CERN-EP-2016-089,
LHCB-PAPER-2016-007

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (arXiv)

A model-dependent amplitude analysis of the decay

B^0\rightarrow D(K^0_S\pi^+\pi^-) K^{*0}

is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0fb

^{-1}

, recorded at

\sqrt{s}=7

and

8 TeV

by the LHCb experiment. The CP violation observables

x_{\pm}

and

y_{\pm}

, sensitive to the CKM angle

\gamma

, are measured to be \begin{eqnarray*} x_- &=& -0.15 \pm 0.14 \pm 0.03 \pm 0.01, y_- &=& 0.25 \pm 0.15 \pm 0.06 \pm 0.01, x_+ &=& 0.05 \pm 0.24 \pm 0.04 \pm 0.01, y_+ &=& -0.65^{+0.24}_{-0.23} \pm 0.08 \pm 0.01, \end{eqnarray*} where the first uncertainties are statistical, the second systematic and the third arise from the uncertainty on the

D\rightarrow K^0_S \pi^+\pi^-

amplitude model. These are the most precise measurements of these observables. They correspond to

\gamma=(80^{+21}_{-22})^{\circ}

and

r_{B^0}=0.39\pm0.13

, where

r_{B^0}

is the magnitude of the ratio of the suppressed and favoured

B^0\rightarrow D K^+ \pi^-

decay amplitudes, in a

K\pi

mass region of

\pm50 MeV

around the

K^*(892)^0

mass and for an absolute value of the cosine of the

K^{*0}

decay angle larger than

0.4

.

Note:

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-007.html

p p: colliding beams
decay: amplitude analysis
B0: hadronic decay
CP: violation
p p: scattering
CKM matrix
mass spectrum: (K pi)
suppression
statistical
LHC-B

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Figures(7)

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