A measurement of $\sin(2\beta)$ from $B \to J/\psi K^0_S$ with the {CDF} detector

Affolder, T.; Akimoto, H.; Akopian, A.; Albrow, M.G.; Amaral, P.; Amendolia, S.R.; Amidei, D.; Antos, J.; Apollinari, G.; Arisawa, T.

doi:10.1103/PhysRevD.61.072005

A measurement of $\sin(2\beta)$ from $B \to J/\psi K^0_S$ with the {CDF} detector

CDF

Collaboration

Sep, 1999

35 pages

Published in:

Phys.Rev.D 61 (2000) 072005

e-Print:

hep-ex/9909003 [hep-ex]

DOI:

10.1103/PhysRevD.61.072005

PDG: sin

(2\beta )

Report number:

FERMILAB-PUB-99-225-E

Experiments:

FNAL-E-0741

View in:

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Abstract: (arXiv)

This paper reports an updated measurement of the Standard Model CP violation parameter

\sin2\beta

using the CDF Detector at Fermilab. The entire Run I data sample of 110 pb

^{-1}

of proton antiproton collisions at

\sqrt{s}=1.8 TeV

is used to identify a signal sample of

\sim 400

B \to J/\psi K^0_S

events, where

J/\psi \to \mu^+\mu^-

and

K_S^0 \to \pi^+\pi^-

. The flavor of the neutral B meson is identified at the time of production by combining information from three tagging algorithms: a same-side tag, a jet-charge tag, and a soft-lepton tag. A maximum likelihood fitting method is used to determine

\sin2\beta = 0.79 {+0.41\atop-0.44}

(stat+syst). This value of

\sin 2 \beta

is consistent with the Standard Model prediction, based upon existing measurements, of a large positive CP violating asymmetry in this decay mode.

Note:

36 pages, 9 figures, submitted to Phys.Rev.D, modifications to text for publication

anti-p p: colliding beams
anti-p p: inclusive reaction
bottom: pair production
B+: hadronic decay
B0: hadronic decay
J/psi(3100)
K*(892)
CP: violation
CKM matrix: unitarity
particle identification: flavor

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