Download or read book Measurement of the textit CP Violating Phase boldsymbol sin 2 beta s Using boldsymbol B 0 s rightarrow J psi phi Decays at CDF written by and published by . This book was released on 2010 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: A B{sub s}° meson can oscillate into its anti-particle, the {bar B}{sub s}° meson, before decaying. CP violation in this system is made possible by the presence of amplitudes from both mixed and unmixed B{sub s}° meson decays. The CP violating phase [beta]s appears in the interference between the decay amplitudes. The quantity sin(2[beta]s) is expected to be small in the standard model. Thus, measuring a large value for sin(2[beta]s) would be an unequivocal sign of new physics participation in the B{sub s}° mixing loop diagram. In this thesis, we present a latest measurement of sin(2[beta]s), using 5.2 fb−1 of data collected at CDF from p{bar p} collisions at a center of mass energy of √s = 1.96 TeV. A time-dependent angular analysis, with the production flavor of the B{sub s}° meson identified with flavor tagging methods, is used to extract sin(2[beta]s) from ≈6500 B{sub s}° → J/[psi][phi] decays. Other parameters of interest, such as the B{sub s}° lifetime and the decay width difference [Delta][Lambda] between the heavy and light B{sub s}° mass eigenstates are determined to high precision. Also, the effect of potential contributions to the final state from B{sub s}° → J/[psi]f0 and B{sub s}° → J/[psi]K+K− decays is considered for the first time. We present 68% and 95% confidence regions in the [beta]s - [Delta][Lambda] plane. The probability that the observed central value is a fluctuation of the data from the standard model expected value of [beta]s is calculated to be 44%. The observed confidence region shows better agreement with the standard model prediction than previous measurements.

Download or read book Measurements of the CP violation Parameter Sin 2 Beta in B superscipt 0 right Arrow J psi K 0 Over S Decays written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the 110 pb−1 Run I data sample, using three complementary flavor-tagging algorithms CDF has made a new measurement of the CP-violating asymmetry sin(2[beta])=0.79{sup +0.41}{sub -0.44}, This corresponds to the limit sin(2[beta])>-0.08 at 95% confidence level. This result agrees well with predictions from indirect constraints based on fits of elements of the CKM matrix.

Download or read book Measurement of the CP Violation Parameter Sin 2 beta in B sup 0 r arrow J psi K sub S sup 0 Decays written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A sample of[approximately] 400 B[sub d][sup 0]/[bar B][sub d][sup 0][r-arrow] J/[psi]K[sub s][sup 0] decays collected in[bar p]p collisions by the CDF detector is used to directly measure the CP-violation parameter sin (2[beta]). They find sin(2[beta])= 0.79[sub[minus]0.44][sup+ 0.41], favoring the standard model expectation of a large CP violation in this B[sup 0] decay mode.

Download or read book Measurement of the CP Violating Phase Sin2betas Using Bs J Psi Phi Decays at CDF written by Elisa Kay Pueschel and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book textit CP Violation in B s 0 rightarrow J psi phi at the Tevatron written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author reviews the history and present status of CP violation measurements made during RunII of the Fermilab Tevatron. Both flavor-tagged and untagged measurements of the Cp-violating phase [beta]{sub s}{sup J/[Psi]} are discussed, as well as measurements of the width difference [Delta][Lambda]{sub s} between heavy and light B{sub s}° mass eigenstates made in the B{sub s}° → J/{Psi}[phi] system.

Download or read book Measurement of the Cp Violation Parameter Sin 2 Beta written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a measurement of the time-dependent asymmetry in the rate of[anti B][sub d][sup 0] versus B[sub d][sup 0] decays to J/[psi]K[sub s][sup 0]. In the context of the Standard Model this is interpreted as a measurement of the CP violation parameter sin(2[beta]). A total of 198[+-]17 B[sub d][sup 0]/[anti B][sub d][sup 0] decays were observed in p[anti p] collisions at[radical]s=1.8 TeV by the CDF detector at the Fermilab Tevatron. The initial B flavor (whether B[sup 0] or[anti B][sup 0]) is determined by a same-side flavor tagging technique. The analysis results in sin(2[beta])=1.8[+-]1.1(stat.)[+-]0.3(syst.). This analysis demonstrates the feasibility of studying CP violation in the B[sup 0]-[anti B][sup 0] system at a hadron collider. By applying the methods used in this analysis, future, higher-statistics experiments should be able to tightly constrain the parameters of the Standard Model.

Download or read book Measurement of the Cp Asymmetry Parameter Sin 2 beta at CDF written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the time-dependent asymmetry in the rate for [anti]B[sup 0][sub d] versus B[sup 0][sub d] decays to J/[psi] K[sup 0][sub S] . In the context of the Standard Model this is interpreted as a measurement of the CP-violation parameter sin(2[beta]). A total of 198 [+-] 17 B[sup 0][sub d]/[anti B][sup 0][sub d] decays were observed in p[anti p] collisions at ps = 1:8 TeV by the CDF detector at the Fermilab Tevatron. The initial b-flavor is determined by a same side avor tagging technique. Our analysis results in sin(2[beta]) = 1:8 [+-] 1:1(stat) [+-] 0:3(syst).

Download or read book Measurement of the CP Violation Parameter Sin 2 beta in B 2 psi K sub S Decays written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Measurement of Sin 2 Beta written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the first observation in 1964, CP violation remains one of the most elusive aspects of the standard model. The CDF collaboration has reported the first evidence of CP violation in the B system using the world's largest sample of B[yields] J/[psi]K[sub S][sup 0] decays. The direct measurement of sin(2[beta])=0.79[sub -0.44][sup+0.41] (combined statistical and systematic error) agrees with the standard model predictions. New data collected from the B-factories and from the upgraded experiments at the Tevatron should allow a more precise measurement of sin 2[beta] in the near future.

Download or read book Measurement of the Lifetime Difference and CP violating Phase in B 1tns J y63 f63 J Psi Phi Decays written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the CP Violating Phase F63 1tns phi S and the Decay Width Difference D63 G63 1tns delta gamma S in the Decay B 1hnO 1tns J Y63 F63 J Psi phi with the ATLAS Experiment written by Claudio Heller and published by . This book was released on 2013 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of B s Oscillations and CP Violation Results from written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the B{sub s}° - B{sub s}° oscillation frequency, [Delta]m{sub s}, using a combination of semi-leptonic and hadronic B{sub s} decay candidates selected from data collected by the D0 Experiment at the Fermilab Tevatron. We also present several results on CP violation, including an improved measurement of the B{sub s} CP-violating phase from a flavor-tagged analysis of B{sub s}° → J/[psi] + [phi] decays.

Download or read book B sup Degree sub D Mixing and CP Violation Measurements at the Tevatron written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present six time-dependent B[sub d][sup 0] mixing measurements of[Delta]m[sub d] from the CDF Run I data. The CDF average is[Delta]m[sub d]= .494[sub[+-] 0.26][sup[+-] 0.26](ps)[sup[minus]1]. They also present a measurement of the CP-violating asymmetry sin (2[beta]) using a sample of B[sup 0]/[bar B][sup 0][r-arrow] J/[psi]K[sub s][sup 0] decays and report sin(2[beta])= .79[sub[minus].44][sup+.41].

Download or read book Measurement of the CP Violation Parameter Sin 2 in B J K sub S Decays written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A sample of - 400 B{sub d}°/{bar B}{sub d}° → J/?K{sub s}° decays collected in {bar p}p collisions by the CDF detector is used to directly measure the CP-violation parameter sin (2?). They find sin(2?) = 0.79{sub -0.44}{sup + 0.41}, favoring the standard model expectation of a large CP violation in this B° decay mode.

Download or read book B 0 Over D Mixing and CP Violation Measurements at the Tevatron written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present six time-dependent B0d mixing measurements of [Delta]md from the CDF Run I data. The CDF average is [Delta]md = .494".026".026(ps)-1. We also present a measurement of the CP-violating asymmetry sin(2[beta]) using a sample of B0/[anti B]0 [yields] J/[psi] K0s decays and report sin(2[beta]) = .79 +41-.44.

Download or read book CP Violation B Mixing and B Lifetime Results from the BaBar Experiment written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The BABAR detector at the PEP-II asymmetric B Factory at SLAC collected a sample of 23 x 10[sup 6] B[bar B] pairs in the years 1999 and 2000. Using this data sample, we measure the amplitude of the time-dependent CP-violating asymmetry in neutral B decays to the CP eigenstates J/[psi] K[sub S][sup 0], [psi](2S) K[sub S][sup 0] and J/[psi] K[sub L][sup 0]. We find a value of sin2[beta]= 0.34[+-] 0.20(stat)[+-] 0.05(syst). We also present preliminary measurements of the B[sup 0][bar B][sup 0] oscillation frequency and of the lifetimes of charged and neutral B mesons.

Download or read book An Updated Measurement of Sin 2 Beta at CDF written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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