Measurement of the CP-violation Parameter sin2$\phi_1$ with a New Tagging Method at the $\Upsilon(5S)$ Resonance

Sato, Y.; Yamamoto, H.; Aihara, H.; Asner, D.M.; Aulchenko, V.; Aushev, T.; Aziz, T.; Bakich, A.M.; Bhardwaj, V.; Bhuyan, B.

doi:10.1103/PhysRevLett.108.171801

Measurement of the CP-violation Parameter sin2 $\phi_1$ with a New Tagging Method at the $\Upsilon(5S)$ Resonance

Belle

Collaboration

•

Y. Sato
(
- Tohoku U.
)

Jan, 2012

13 pages

Published in:

Phys.Rev.Lett. 108 (2012) 171801

e-Print:

1201.3502 [hep-ex]

DOI:

10.1103/PhysRevLett.108.171801

PDG: sin

(2\beta )

Report number:

BELLE-PREPRINT-2012-1,
KEK-PREPRINT-2011-23

Experiments:

KEK-BF-BELLE

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reference search12 citations

Citations per year

Abstract: (arXiv)

We report a measurement of the CP-violation parameter sin2

\phi_1

at the

\Upsilon(5S)

resonance using a new tagging method, called "

B

-

\pi

tagging." In

\Upsilon(5S)

decays containing a neutral

B

meson, a charged

B

, and a charged pion, the neutral

B

is reconstructed in the

J/\psi K_S^0

CP-eigenstate decay channel. The initial flavor of the neutral

B

meson at the moment of the

\Upsilon(5S)

decay is opposite to that of the charged

B

and may thus be inferred from the charge of the pion without reconstructing the charged

B

. From the asymmetry between

B

-

\pi^+

and

B

-

\pi^-

tagged

J/\psi K_S^0

yields, we determine sin2

\phi_1

= 0.57

\pm

0.58(stat)

\pm

0.06(syst). The results are based on 121 fb

^{-1}

of data recorded by the Belle detector at the KEKB

e^+ e^-

collider.

Note:

6 pages, 3 figures (submitted to PRL)

12.15.Hh
11.30.Er
13.25.Hw
CP: violation
Upsilon(10870): hadronic decay
BELLE
data analysis method
electron positron: annihilation
bottom meson: pair production
particle identification: flavor

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Measurement of the CP-violation Parameter sin2ϕ1\phi_1ϕ1​ with a New Tagging Method at the Υ(5S)\Upsilon(5S)Υ(5S) Resonance

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Measurement of the CP-violation Parameter sin2 $\phi_1$ with a New Tagging Method at the $\Upsilon(5S)$ Resonance