skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Techniques for Bs Mixing at CDF

Abstract

The techniques used to perform a measurement of the mixing frequency of the B{sub s} meson ({Delta}M{sub s}) with the CDF detector at the TeVatron collider are described. Particular stress is put on CDF techniques for flavor tagging, which is possibly the major issue for mixing measurements at a hadron collider. Also CDF performances on lifetime and final state reconstruction are described. The final result of the amplitude scanning presented at 2005 Winter Conferences is reported.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
878999
Report Number(s):
FERMILAB-CONF-05-500-E
TRN: US0700921
DOE Contract Number:
AC02-76CH03000
Resource Type:
Conference
Resource Relation:
Conference: Presented at Hadron Collider Physics Symposium 2005, Les Diablerets, Switzerland, 4-9 Jul 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; HADRONS; LIFETIME; MESONS; PHYSICS; Experiment-HEP, Instrumentation

Citation Formats

Salamanna, Giuseppe, and /Rome U. /INFN, Rome. Techniques for Bs Mixing at CDF. United States: N. p., 2005. Web.
Salamanna, Giuseppe, & /Rome U. /INFN, Rome. Techniques for Bs Mixing at CDF. United States.
Salamanna, Giuseppe, and /Rome U. /INFN, Rome. Thu . "Techniques for Bs Mixing at CDF". United States. doi:. https://www.osti.gov/servlets/purl/878999.
@article{osti_878999,
title = {Techniques for Bs Mixing at CDF},
author = {Salamanna, Giuseppe and /Rome U. /INFN, Rome},
abstractNote = {The techniques used to perform a measurement of the mixing frequency of the B{sub s} meson ({Delta}M{sub s}) with the CDF detector at the TeVatron collider are described. Particular stress is put on CDF techniques for flavor tagging, which is possibly the major issue for mixing measurements at a hadron collider. Also CDF performances on lifetime and final state reconstruction are described. The final result of the amplitude scanning presented at 2005 Winter Conferences is reported.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 2005},
month = {Thu Dec 01 00:00:00 EST 2005}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • We review latest experimental results on the B{sub s} mixing and lifetime difference measurements at CDF. We report on the latest {beta}{sub s} and {Delta}{Lambda}{sub s} results from B{sub s} {yields} J/{Psi}{phi}. We also discuss flavor specific {Delta}{Lambda}{sub s} measurements, including information from hadronic channels, B{sub s} {yields} D{sub s}D{sub s} and B{sub s} {yields} KK. We describe the new flavor tagging methodology and its calibration using the B{sub s} oscillations.
  • The CDF collaboration presents an updated measurement of the CP-violating parameter {beta}{sub s}{sup J/{Psi}{phi}} and of the decay width difference {Delta}{Lambda}{sub s} using approximately 6500 B{sub s} {yields} J/{Psi}{phi} decays collected by the dimuon trigger and reconstructed in a data sample corresponding to 5.2 fb{sup -1} of integrated luminosity. Besides exploiting the two-fold increase in the data sample with respect to the previous measurement, several improvements have been introduced in the analysis including a fully data-driven flavor tagging calibration and proper treatment of possible S-wave contributions. We find that the CP-violating phase is within the range {beta}{sub s}{sup J/{Psi}{phi}} {element_of}more » [0.02, 0.52] {union} [1.08, 1.55] at 68% C.L. The decay width difference is found to be {Delta}{Lambda}{sub s} = 0.075 {+-} 0.035 (stat) {+-} 0.01 (syst) ps{sup -1}. In addition, we present the most precise mean B{sub s} lifetime {tau}{sub s}, polarization amplitudes |A{sub 0}|{sup 2},|A{sub {parallel}}|{sup 2} and |A{sub {perpendicular}}|{sup 2}, as well as strong phase {delta}{sub {perpendicular}}: {tau}{sub s} = 458.6 {+-} 7.6(stat) {+-} 3.6(syst) {micro}m; |A{sub 0}|{sup 2} = 0.524 {+-} 0.013(stat) {+-} 0.015(syst); |A{sub {parallel}}|{sup 2} = 0.231 {+-} 0.014(stat) {+-} 0.015(syst); and {delta}{sub {perpendicular}} = 2.95 {+-} 0.64(stat) {+-} 0.07(syst).« less
  • The observation of new suppressed B{sub s}{sup 0} decays, B{sub s}{sup 0} {yields} J/{Psi}K*(892){sup 0} and B{sub s}{sup 0} {yields} J/{Psi}K{sub s}{sup 0}, and the measurement of their branching ratios is presented. This measurement is based on an integrated luminosity of 5.9 fb{sup -1} of CDF data collected by a dedicated di-muon trigger. A cut based optimization is carried out for the observation of B{sub s}{sup 0} {yields} J/{Psi}K*{sup 0}, while a neural network is used for the B{sub s}{sup 0} {yields} J/{Psi}K{sub s}{sup 0}. In addition to the observation of the new decay modes, the ratios of branching fractionsmore » to the reference B{sup 0} decays are measured.« less
  • The Tevatron collider at Fermilab provides a very rich environment for the study of B{sub s} mesons. B{sub s} Mixing is the most important analysis within the B Physics program of both experiments. In this paper they summarize the most recent results on this topic from both D0 and CDF experiments. There were very important updates in both experiments after his last talk, hence the organizers warmly recommended me to include the latest available results on B{sub s} mixing, instead of what he presents there.
  • No abstract prepared.