Study of $C P$ Violating Effects in Time Dependent $B^{0} ({\bar{B}}^{0}) \to D^{(*) \mp} π^{\pm}$ Decays

Publisher Website

13 July 2004

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 93 (3) , 031802
https://doi.org/10.1103/physrevlett.93.031802

Abstract

We report measurements of time dependent decay rates for

B^{0} ({\bar{B}}^{0}) \to D^{(*) \mp} π^{\pm}

decays and extraction of

C P

violation parameters containing

ϕ_{3}

. Using fully reconstructed

D^{(*)} π

events from a

140 {f b}^{- 1}

data sample collected at the

Υ (4 S)

resonance, we obtain the

C P

violation parameters for

D^{*} π

and

D π

decays,

2 R_{D^{(*)} π} \sin ﻿ (2 ϕ_{1} + ϕ_{3} \pm δ_{D^{(*)} π})

, where

R_{D^{(*)} π}

is the ratio of the magnitudes of the doubly Cabibbo-suppressed and Cabibbo-favored amplitudes, and

δ_{D^{(*)} π}

is the strong phase difference between them. Under the assumption of

δ_{D^{(*)} π}

being close to either

0 °

or

180 °

, we obtain

| 2 R_{D^{*} π} \sin ﻿ (2 ϕ_{1} + ϕ_{3}) | = 0.060 \pm 0.040 (s t a t) \pm 0.019 (s y s t)

and

| 2 R_{D π} \sin ﻿ (2 ϕ_{1} + ϕ_{3}) | = 0.061 \pm 0.037 (s t a t) \pm 0.018 (s y s t)

.

Keywords

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