An updated measurement of sin (2{Beta}) at CDF

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We report an updated direct measurement of the Standard Model CP violation parameter sin(2{beta}) using the CDF Detector at Fermilab. We use the entire Run-I data sample of 110 pb{sup -1} of proton-antiproton collisions at {radical}s = 1.8 TeV. In this analysis, we have combined three tagging methods: a same-side tag, a soft-lepton tag, and a jet-charge tag, and also added events that have less precise lifetime information because they are not fully contained within the acceptance of the SVX. The signal sample consists of {approx} 400 B {yields} J/{psi} K{sub S}{sup 0} events. A maximum likelihood fitting method is ... continued below

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241 Kilobytes pages

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Bedeschi, Franco November 5, 1999.

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We report an updated direct measurement of the Standard Model CP violation parameter sin(2{beta}) using the CDF Detector at Fermilab. We use the entire Run-I data sample of 110 pb{sup -1} of proton-antiproton collisions at {radical}s = 1.8 TeV. In this analysis, we have combined three tagging methods: a same-side tag, a soft-lepton tag, and a jet-charge tag, and also added events that have less precise lifetime information because they are not fully contained within the acceptance of the SVX. The signal sample consists of {approx} 400 B {yields} J/{psi} K{sub S}{sup 0} events. A maximum likelihood fitting method is used to measure sin(2{beta}) = 0.79{sub -0.44}{sup +0.41} (stat.+syst.). We calculate a 93% Feldman-Cousins confidence interval of 0 < sin(2{beta}) < 1. This measurement is the best direct indication for CP violation in the neutral B meson sector to date. The sin(2{beta}) value is consistent with the Standard Model prediction of large CP symmetry violation in the b quark system.

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241 Kilobytes pages

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  • 13th Les Rencontres de Physique de la Valle d'Aosta: Results and Perspectives in Particle Physics, La Thuile, Valle d'Aoste (IT), 02/28/1999--03/06/1999

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  • Report No.: FERMILAB-Conf-99-286-E
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 14347
  • Archival Resource Key: ark:/67531/metadc627725

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  • November 5, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 1, 2016, 5:11 p.m.

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Bedeschi, Franco. An updated measurement of sin (2{Beta}) at CDF, article, November 5, 1999; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc627725/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.