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

Affolder, 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

Journal Article · Wed Sep 01 04:00:00 EDT 1999 · Phys.Rev.D

DOI:https://doi.org/10.1103/PhysRevD.61.072005· OSTI ID:1893446

Affolder, T.

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.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: CDF

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1893446

Report Number(s):: FERMILAB-PUB-99-225-E; arXiv:hep-ex/9909003; oai:inspirehep.net:506520

Journal Information:: Phys.Rev.D, Journal Name: Phys.Rev.D Vol. 61

Country of Publication:: United States

Language:: English

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