Elsevier

Physics Letters B

Volume 718, Issue 1, 15 November 2012, Pages 43-55
Physics Letters B

A model-independent Dalitz plot analysis of B±DK± with DKS0h+h (h=π,K) decays and constraints on the CKM angle γ

https://doi.org/10.1016/j.physletb.2012.10.020Get rights and content
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Abstract

A binned Dalitz plot analysis of B±DK± decays, with DKS0π+π and DKS0K+K, is performed to measure the CP-violating observables x± and y± which are sensitive to the CKM angle γ. The analysis exploits 1.0 fb1 of data collected by the LHCb experiment. The study makes no model-based assumption on the variation of the strong phase of the D decay amplitude over the Dalitz plot, but uses measurements of this quantity from CLEO-c as input. The values of the parameters are found to be x=(0.0±4.3±1.5±0.6)×102, y=(2.7±5.2±0.8±2.3)×102, x+=(10.3±4.5±1.8±1.4)×102 and y+=(0.9±3.7±0.8±3.0)×102. The first, second, and third uncertainties are the statistical, the experimental systematic, and the error associated with the precision of the strong-phase parameters measured at CLEO-c, respectively. These results correspond to γ=(4438+43)°, with a second solution at γγ+180°, and rB=0.07±0.04, where rB is the ratio between the suppressed and favoured B decay amplitudes.

Cited by (0)

© CERN for the benefit of the LHCb Collaboration.

q

Associated to Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.

r

Associated to Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.

a

P.N. Lebedev Physical Institute, Russian Academy of Science (LPI RAS), Moscow, Russia.

b

Università di Bari, Bari, Italy.

c

Università di Bologna, Bologna, Italy.

d

Università di Cagliari, Cagliari, Italy.

e

Università di Ferrara, Ferrara, Italy.

f

Università di Firenze, Firenze, Italy.

g

Università di Urbino, Urbino, Italy.

h

Università di Modena e Reggio Emilia, Modena, Italy.

i

Università di Genova, Genova, Italy.

j

Università di Milano Bicocca, Milano, Italy.

k

Università di Roma Tor Vergata, Roma, Italy.

l

Università di Roma La Sapienza, Roma, Italy.

m

Università della Basilicata, Potenza, Italy.

n

LIFAELS, La Salle, Universitat Ramon Llull, Barcelona, Spain.

o

Hanoi University of Science, Hanoi, Viet Nam.

p

Massachusetts Institute of Technology, Cambridge, MA, United States.