Measurement of the CP violation parameters in $B^0 \to \pi^+ \pi^-$ decays - INSPIRE

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Measurement of the CP violation parameters in $B^0 \to \pi^+ \pi^-$ decays

Belle

Collaboration

Feb, 2013

11 pages

Published in:

Phys.Rev.D 88 (2013) 9, 092003

Contribution to:

- CKM 2012

Published: Nov 19, 2013

e-Print:

1302.0551 [hep-ex]

DOI:

10.1103/PhysRevD.88.092003

PDG:

\mathit C_{{{\mathit \pi}} {{\mathit \pi}} }

{{\mathit B}^{0}}

\rightarrow

{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}

Report number:

BELLE-CONF-1211,
BELLE-PREPRINT-2013-11,
KEK-PREPRINT-2013-21

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

reference search81 citations

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Abstract: (APS)

We present a measurement of the charge-parity (CP) violating parameters in B0→π+π- decays. The results are obtained from the final data sample containing 772×106 BB¯ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the CP violation parameters ACP(B0→π+π-)=+0.33±0.06(stat)±0.03(syst),SCP(B0→π+π-)=-0.64±0.08(stat)±0.03(syst),where ACP and SCP represent the direct and mixing-induced CP asymmetries in B0→π+π- decays, respectively. Using an isospin analysis including results from other Belle measurements, we find 23.8°<ϕ2<66.8° is disfavored at the 1σ level, where ϕ2 is one of the three interior angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle related to Bu,d decays.

Note:

16 pages, 5 figures, CKM2012 conference paper, Submitted to PRD

11.30.Er
12.15.Hh
13.25.Hw
CP: violation
asymmetry: CP: time dependence
BELLE
electron positron: annihilation
isospin
KEK-B
B: pair production

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