Model-independent measurement of the CKM angle $\gamma$ using $B^0 \to D K^{\ast 0}$ decays with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ and $K_{S}^{0} K^{+} K^{-}$

Aaij, Roel; Abellán Beteta, Carlos; Adeva, Bernardo; Adinolfi, Marco; Ajaltouni, Ziad; Akar, Simon; Albrecht, Johannes; Alessio, Federico; Alexander, Michael; Ali, Suvayu

doi:10.1007/JHEP06(2016)131

Model-independent measurement of the CKM angle $\gamma$ using $B^0 \to D K^{\ast 0}$ decays with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ and $K_{S}^{0} K^{+} K^{-}$

LHCb

Collaboration

Apr 6, 2016

34 pages

Published in:

JHEP 06 (2016) 131

Published: Jun 21, 2016

e-Print:

1604.01525 [hep-ex]

DOI:

10.1007/JHEP06(2016)131

PDG:

\gamma

Report number:

LHCB-PAPER-2016-006,
CERN-EP-2016-083

Experiments:

CERN-LHC-LHCb

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Abstract: (Springer)

A binned Dalitz plot analysis of the decays B

^{0}

→ DK

^{∗0}

, with D → K

_{S}^{0}

π

^{+}

π

^{−}

and D → K

_{S}^{0}

K

^{+}

K

^{−}

, is performed to measure the observables x

_{±}

and y

_{±}

, which are related to the CKM angle γ and the hadronic parameters of the decays. The D decay strong phase variation over the Dalitz plot is taken from measurements performed at the CLEO-c experiment, making the analysis independent of the D decay model. With a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb

^{−1}

, collected by the LHCb experiment, the values of the CP violation parameters are found to be x

_{+}

= 0.05 ± 0.35 ± 0.02, x

_{−}

= −0.31 ± 0.20 ± 0.04, y

_{+}

= −0.81 ± 0.28 ± 0.06 and y

_{−}

= 0.31 ± 0.21 ± 0.05, where the first uncertainties are statistical and the second systematic. These observables correspond to values γ = (71 ± 20)°,

{r_B}_{{}^0}=0.56\pm 0.17

and

{\delta_B}_{{}^0}=\left(20{4}_{-20}^{+21}\right){}^{\circ}

. The parameters

{r_B}_{{}^0}

and

{\delta_B}_{{}^0}

are the magnitude ratio and strong phase difference between the suppressed and favoured B

^{0}

decay amplitudes, and have been measured in a region of ±50 MeV/c

^{2}

around the K

^{∗}

(892)

^{0}

mass and with the magnitude of the cosine of the K

^{∗}

(892)

^{0}

helicity 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-2016-006.html

B physics
CKM angle gamma
CP violation
Flavor physics
Hadron-Hadron scattering (experiments)
p p: colliding beams
B0: hadronic decay
D: hadronic decay
decay: model
p p: scattering

References(53)

Figures(17)

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