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Title: Time Dependent B0s - anti-B0s Mixing Using Inclusive and Semileptonic B Decays at SLD

Abstract

We set a preliminary 95% C.L. exclusion on the oscillation frequency of B{sub s}{sup 0} - {bar B}{sub s}{sup 0} mixing using a sample of 400,000 hadronic Z{sup 0} decays collected by the SLD experiment at the SLC between 1996 and 1998. The analyses determine the b-hadron flavor at production by exploiting the large forward-backward asymmetry of polarized Z{sup 0} {yields} b{bar b} decays as well as information from the hemisphere opposite that of the reconstructed B decay. In one analysis, B decay vertices are reconstructed inclusively with a topological technique, and separation between B{sub s}{sup 0} and {bar B}{sub s}{sup 0} decays exploits the B{sub s}{sup 0} {yields} D{sub s}{sup -} cascade charge structure. In the other analysis, semileptonic decays are selected and the B decay point is reconstructed by intersecting a lepton track with the trajectory of a topologically reconstructed D meson. The two analyses are combined with a third analysis described elsewhere to exclude the following values of the B{sub s}{sup 0} - {bar B}{sub s}{sup 0} mixing oscillation frequency: {Delta}m{sub s} < 7.6 ps{sup -1} and 11:8 < {Delta}m{sub s} < 14:8 ps{sup -1} at the 95% confidence level.

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, Menlo Park, CA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
784777
Report Number(s):
SLAC-PUB-8568
TRN: US0108592
DOE Contract Number:
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 11 Dec 2000
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; D S MESONS; LEPTONS; OSCILLATIONS; PARTICLE PRODUCTION; SEMILEPTONIC DECAY; B S MESONS; ANTIMESONS; Z NEUTRAL BOSONS; STANFORD LINEAR COLLIDER DETECTOR; QUANTUM FLAVORDYNAMICS; B QUARKS

Citation Formats

Willocq, Stephane. Time Dependent B0s - anti-B0s Mixing Using Inclusive and Semileptonic B Decays at SLD. United States: N. p., 2000. Web. doi:10.2172/784777.
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Willocq, Stephane. Time Dependent B0s - anti-B0s Mixing Using Inclusive and Semileptonic B Decays at SLD. United States. doi:10.2172/784777.
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Willocq, Stephane. Mon . "Time Dependent B0s - anti-B0s Mixing Using Inclusive and Semileptonic B Decays at SLD". United States. doi:10.2172/784777. https://www.osti.gov/servlets/purl/784777.
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@article{osti_784777,
title = {Time Dependent B0s - anti-B0s Mixing Using Inclusive and Semileptonic B Decays at SLD},
author = {Willocq, Stephane},
abstractNote = {We set a preliminary 95% C.L. exclusion on the oscillation frequency of B{sub s}{sup 0} - {bar B}{sub s}{sup 0} mixing using a sample of 400,000 hadronic Z{sup 0} decays collected by the SLD experiment at the SLC between 1996 and 1998. The analyses determine the b-hadron flavor at production by exploiting the large forward-backward asymmetry of polarized Z{sup 0} {yields} b{bar b} decays as well as information from the hemisphere opposite that of the reconstructed B decay. In one analysis, B decay vertices are reconstructed inclusively with a topological technique, and separation between B{sub s}{sup 0} and {bar B}{sub s}{sup 0} decays exploits the B{sub s}{sup 0} {yields} D{sub s}{sup -} cascade charge structure. In the other analysis, semileptonic decays are selected and the B decay point is reconstructed by intersecting a lepton track with the trajectory of a topologically reconstructed D meson. The two analyses are combined with a third analysis described elsewhere to exclude the following values of the B{sub s}{sup 0} - {bar B}{sub s}{sup 0} mixing oscillation frequency: {Delta}m{sub s} < 7.6 ps{sup -1} and 11:8 < {Delta}m{sub s} < 14:8 ps{sup -1} at the 95% confidence level.},
doi = {10.2172/784777},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Dec 11 00:00:00 EST 2000},
month = {Mon Dec 11 00:00:00 EST 2000}
}
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DOI:  10.2172/784777
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  • We set a preliminary 95% C.L. exclusion on the oscillation frequency of B{sub s}{sup 0} - {bar B}{sub s}{sup 0} mixing using a sample of 400,000 hadronic Z{sup 0} decays collected by the SLD experiment at the SLC between 1996 and 1998. The analyses determine the b-hadron flavor at production by exploiting the large forward-backward asymmetry of polarized Z{sup 0} {yields} b{bar b} decays as well as information from the hemisphere opposite that of the reconstructed B decay. In one analysis, B decay vertices are reconstructed inclusively with a topological technique, and separation between B{sub s}{sup 0} and {bar B}{submore » s}{sup 0} decays exploits the B{sub s}{sup 0} {yields} D{sub s}{sup -} cascade charge structure. In the other analysis, semileptonic decays are selected and the B decay point is reconstructed by intersecting a lepton track with the trajectory of a topologically reconstructed D meson. The two analyses are combined with a third analysis described elsewhere to exclude the following values of the B{sub s}{sup 0} - {bar B}{sub s}{sup 0} mixing oscillation frequency: {Delta}m{sub s} < 7.6 ps{sup -1} and 11:8 < {Delta}m{sub s} < 14:8 ps{sup -1} at the 95% confidence level.« less

  • We set a preliminary 95% C.L. exclusion on the oscillation frequency of B{sub s}{sup 0}-{bar B}{sub s}{sup 0} mixing using a sample of 350,000 hadronic Z{sup 0} decays collected by the SLD experiment at the SLC during the 1997-98 run. The analyses determine the b-hadron flavor at production by exploiting the large forward-backward asymmetry of polarized Z{sup 0} {yields} b{bar b} decays as well as information from the hemisphere opposite that of the reconstructed B decay. In one analysis, B decay vertices are reconstructed inclusively with a new topological technique, and separation between B{sub s}{sup 0} and {bar B}{sub s}{supmore » 0} decays exploits the B{sub s}{sup 0} {yields} D{sub s}{sup -} cascade charge structure. In the other analysis, semileptonic decays are selected and the B decay point is reconstructed by intersecting a lepton track with the trajectory of a topologically reconstructed D meson. The two analyses are combined with a third analysis described elsewhere to exclude the following values of the B{sub s}{sup 0}-{bar B}{sub s}{sup 0} mixing oscillation frequency: {Delta}m{sub s} < 5.2 ps{sup -1} and 11.3 < {Delta}m{sub s} < 14.2 ps{sup -1} at the 95% confidence level.« less

  • - Nuclear Instruments and Methods
    No abstract prepared.

  • The authors set a preliminary 95% C.L. exclusion on the oscillation frequency of B{sub s}{sup 0}-{anti B}{sub s}{sup 0} mixing using a sample of 250,000 hadronic Z{sup 0} decays collected by the SLD experiment at the SLC between January 1996 and March 1998. The analyses determine the b-hadron flavor at production by exploiting the large forward-backward asymmetry of polarized Z{sup 0} {yields} b{anti b} decays as well as information from the hemisphere opposite that of the reconstructed B decay. In one analysis, B decay vertices are reconstructed inclusively with a topological technique, and separation between B{sub s}{sup 0} and {antimore » B}{sub s}{sup 0} decays exploits the B{sub s}{sup 0} {yields} D{sub s}{sup -} cascade charge structure. The other analysis selects semileptonic decays reconstructed by intersecting a lepton with he trajectory of a topologically reconstructed D meson. The two analyses are combined to exclude the following values of the B{sub s}{sup 0}-{anti B}{sub s}{sup 0} mixing oscillation frequency: {Delta}m{sub s} < 1.7 ps{sup -1} and 3.3 < {Delta}m{sub s} < 5.0 ps{sup -1} at the 95% confidence level.« less

  • The time dependence of B{sub d}{sup o}-{bar B}{sub d}{sup o} mixing has been observed in events containing high P{sub t} leptons using a highly inclusive vertexing method to determine the B decay length and boost. The initial state B hadron flavour is determined using the large forward-backward asymmetry provided by the highly polarized electron beams of SLC in combination with a jet charge technique. From a sample of 150,000 hadronic Z{sup o} decays observed in the SLD detector at the SLC between 1993 and 1995, the mass difference between the two B{sub d}{sup o} mass eigenstates has been measured tomore » be {Delta}m{sub d} = 0.486 {+-} 0.065(stat) {+-} 0.035(syst) ps{sup -1}.« less