Measurements of CP violation in B0 ---> D*- pi+ and B0 ---> D- pi+ decays - INSPIRE

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Measurements of CP violation in B0 ---> D*- pi+ and B0 ---> D- pi+ decays

Belle

Collaboration

•

F.J. Ronga
(
- KEK, Tsukuba
)

Apr, 2006

14 pages

Published in:

Phys.Rev.D 73 (2006) 092003

e-Print:

hep-ex/0604013 [hep-ex]

DOI:

10.1103/PhysRevD.73.092003

PDG:

\vert

(2\beta

\gamma )\vert

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

reference search75 citations

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Abstract:

We report measurements of time dependent decay rates for

B^0 \to D^{(*)-}\pi^+

decays and extraction of CP violation parameters that depend on

\phi_3

. Using fully reconstructed

D^{(*)}\pi

events and partially reconstructed

D^{*}\pi

events from a data sample that contains 386 million

B\bar{B}

pairs that was collected near the

\Upsilon(4S)

resonance, with the Belle detector at the KEKB asymmetric energy

e^+ e^-

collider, we obtain the CP violation parameters

S^+ (D^{(*)}\pi)

and

S^- (D^{(*)}\pi)

. We obtain

S^+ (D^* \pi) = 0.049 \pm 0.020(\mathrm{stat}) \pm 0.011(\mathrm{sys})

,

S^- (D^* \pi) = 0.031 \pm 0.019(\mathrm{stat}) \pm 0.011(\mathrm{sys})

, and

S^+ (D \pi) = 0.031 \pm 0.030(\mathrm{stat}) \pm 0.012(\mathrm{sys})

,

S^- (D \pi) = 0.068 \pm 0.029(\mathrm{stat}) \pm 0.012(\mathrm{sys})

. These results are an indication of CP violation in

B^0 \to D^{*-}\pi^+

and

B^0 \to D^- \pi^+

decays at the

2.5 \sigma

and

2.2 \sigma

levels, respectively. If we use the values of

R_{D^{(*)}\pi}

that are derived using assumptions of factorization and SU(3) symmetry, the branching fraction measurements for the

D_s^{(*)} \pi

modes, and lattice QCD calculations, we can restrict the allowed region of

|\sin (2\phi_1 + \phi_3)|

to be above 0.44 and 0.52 at 68% confidence level from the

D^* \pi

and

D \pi

modes, respectively.

11.30.Er
13.66.Bc
13.25.Hw
14.40.Lb
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B0: hadronic decay
D*(2010)

References(31)

Figures(0)

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