National Technical Reports Library - NTRL

National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.




Details
Actions:
Download PDFDownload PDF
Download

Study of Factorization and a Measurement of CP Violation.


DE2008922228

Publication Date 2006
Personal Author Dahmes, B.
Page Count 270
Abstract We report on a study of the decay (bar B)(sup 0) (yields) D*(sup +) (omega)(pi)(sup -) with the BABAR detector at the PEP-II B-factory at the Stanford Linear Accelerator Center. Based on a sample of 232 million B(sup 0)(bar B)(sup 0) decays collected between 1999 and 2004, we measure the branching fraction (Beta)((bar B)(sup 0) (yields) D*(sup +) (omega)(pi)(sup -)) = (2.88 (+-) 0.21(stat.) (+-) 0.31(syst.)) x 10(sup -3). We study the invariant mass spectrum of the (omega)(pi)(sup -) system in this decay. This spectrum is in good agreement with expectations based on factorization and the measured spectrum in (tau)(sup -) (yields) (omega)(pi)(sup -) (nu)(sub (tau)). We also measure the polarization of the D*(sup +) as a function of the (omega)(pi)(sup -) mass. In the mass region 1.1 to 1.9 GeV we measure the fraction of longitudinal polarization of the D*(sup +) to be (Lambda)(sub L)/(Lambda) = 0.654 (+-) 0.042(stat.) (+-) 0.016(syst.). This is in agreement with the expectations from heavy-quark effective theory and factorization assuming that the decay proceeds as (bar B)(sup 0) (yields) D*(sup +) (rho)(1450)(sup -), (rho)(1450)(sup -) (yields) (omega)(pi)(sup -). Furthermore, we present the results on the time-dependent CP asymmetry in neutral B meson decays to the CP eigenstate J/(psi)K(sub L). The measurements use a data sample of about 88 million (Upsilon)(4S) (yields) B(bar B) decays collected between 1999 and 2002 with the BABAR detector. We study events in which one neutral B meson is fully reconstructed in the J/(psi)K(sub L) final state and the other B meson is determined to be either a B(sup 0) or a (bar B)(sup 0) from its decay products. The amplitude of the CP asymmetry, which in the Standard Model is proportional to sin 2(beta), is derived from the decay-time distributions in such events. We measure sin 2(beta) = 0.723 (+-) 0.158(stat.) (+-) 0.086(syst.), which is consistent with Standard Model expectations.
Keywords
  • Accelerators
  • BABAR detector
  • Factorization
  • CP violation
Source Agency
  • Technical Information Center Oak Ridge Tennessee
Corporate Authors Stanford Linear Accelerator Center, CA.; Department of Energy, Washington, DC. Office of Science.
Supplemental Notes Sponsored by Department of Energy, Washington, DC. Office of Science.
Document Type Technical Report
NTIS Issue Number 200814
Contract Number
  • DE-AC02-76SF00515
Study of Factorization and a Measurement of CP Violation.
Study of Factorization and a Measurement of CP Violation.
DE2008922228

  • Accelerators
  • BABAR detector
  • Factorization
  • CP violation
  • Technical Information Center Oak Ridge Tennessee
  • DE-AC02-76SF00515
Loading