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

Title: Measurement of the B{sup 0} lifetime and the B{sup 0}B{sup 0} oscillation frequency using partially reconstructed B{sup 0}{yields}D*{sup +}l{sup -}{nu}{sub l} decays

Abstract

We present a simultaneous measurement of the B{sup 0} lifetime {tau}{sub B{sup 0}} and B{sup 0}B{sup 0} oscillation frequency {delta}m{sub d}. We use a sample of about 50 000 partially reconstructed B{sup 0}{yields}D*{sup +}l{sup -}{nu}{sub l} decays identified with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring at SLAC. The flavor of the other B meson in the event is determined from the charge of another high-momentum lepton. The results are {tau}{sub B{sup 0}}=(1.504{+-}0.013(stat){sub -0.013}{sup +0.018}(syst)) ps, {delta}m{sub d}=(0.511{+-}0.007(stat){sub -0.006}{sup +0.007}(syst)) ps{sup -1}.

Authors:
; ; ; ; ; ; ; ;  [1];  [2]; ; ;  [3]; ; ; ; ;  [4]; ;  [5]
  1. Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux (France)
  2. IFAE, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Barcelona (Spain)
  3. Dipartimento di Fisica and INFN, Universita di Bari, I-70126 Bari (Italy)
  4. Institute of High Energy Physics, Beijing 100039 (China)
  5. Institute of Physics, University of Bergen, N-5007 Bergen (Norway) (and others)
Publication Date:
OSTI Identifier:
20774571
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.73.012004; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B NEUTRAL MESONS; ELECTRON-POSITRON INTERACTIONS; LIFETIME; MULTIPARTICLE SPECTROMETERS; OSCILLATIONS; PARTICLE IDENTIFICATION; PEP STORAGE RINGS; SEMILEPTONIC DECAY; STANFORD LINEAR ACCELERATOR CENTER

Citation Formats

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J.P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Pappagallo, M., Pompili, A., Chen, J.C., Qi, N.D., Rong, G., Wang, P., Zhu, Y.S., Eigen, G., and Ofte, I.. Measurement of the B{sup 0} lifetime and the B{sup 0}B{sup 0} oscillation frequency using partially reconstructed B{sup 0}{yields}D*{sup +}l{sup -}{nu}{sub l} decays. United States: N. p., 2006. Web. doi:10.1103/PhysRevD.73.012004.
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J.P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Pappagallo, M., Pompili, A., Chen, J.C., Qi, N.D., Rong, G., Wang, P., Zhu, Y.S., Eigen, G., & Ofte, I.. Measurement of the B{sup 0} lifetime and the B{sup 0}B{sup 0} oscillation frequency using partially reconstructed B{sup 0}{yields}D*{sup +}l{sup -}{nu}{sub l} decays. United States. doi:10.1103/PhysRevD.73.012004.
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J.P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Pappagallo, M., Pompili, A., Chen, J.C., Qi, N.D., Rong, G., Wang, P., Zhu, Y.S., Eigen, G., and Ofte, I.. Sun . "Measurement of the B{sup 0} lifetime and the B{sup 0}B{sup 0} oscillation frequency using partially reconstructed B{sup 0}{yields}D*{sup +}l{sup -}{nu}{sub l} decays". United States. doi:10.1103/PhysRevD.73.012004.
@article{osti_20774571,
title = {Measurement of the B{sup 0} lifetime and the B{sup 0}B{sup 0} oscillation frequency using partially reconstructed B{sup 0}{yields}D*{sup +}l{sup -}{nu}{sub l} decays},
author = {Aubert, B. and Barate, R. and Boutigny, D. and Couderc, F. and Karyotakis, Y. and Lees, J.P. and Poireau, V. and Tisserand, V. and Zghiche, A. and Grauges, E. and Palano, A. and Pappagallo, M. and Pompili, A. and Chen, J.C. and Qi, N.D. and Rong, G. and Wang, P. and Zhu, Y.S. and Eigen, G. and Ofte, I.},
abstractNote = {We present a simultaneous measurement of the B{sup 0} lifetime {tau}{sub B{sup 0}} and B{sup 0}B{sup 0} oscillation frequency {delta}m{sub d}. We use a sample of about 50 000 partially reconstructed B{sup 0}{yields}D*{sup +}l{sup -}{nu}{sub l} decays identified with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring at SLAC. The flavor of the other B meson in the event is determined from the charge of another high-momentum lepton. The results are {tau}{sub B{sup 0}}=(1.504{+-}0.013(stat){sub -0.013}{sup +0.018}(syst)) ps, {delta}m{sub d}=(0.511{+-}0.007(stat){sub -0.006}{sup +0.007}(syst)) ps{sup -1}.},
doi = {10.1103/PhysRevD.73.012004},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • The authors present a simultaneous measurement of the {bar B}{sup 0} lifetime {tau}(B{sup 0}) and mixing parameter {Delta}m{sub d}. They use a sample of about 50000 {bar B}{sup 0} --> D*{sup +} 1 {anti {nu}}(l) partially reconstructed decays identified with the BABAR detector at the PEP-II storage ring at SLAC, where the flavor of the other B meson is determined from the charge of another high momentum lepton in the same event. The preliminary results are: tau(B{sup 0}) = (1.50 {+-} 0.008(stat.) {+-} 0.030(syst.)) ps, {Delta}m{sub d} = (0.523 {+-} 0.004(stat.) {+-} 0.007(syst.)) p{sup s}(-1).
  • The authors present a simultaneous measurement of the {bar B}{sup 0} lifetime {tau}{sub B{sup 0}} and B{sup 0}{bar B}{sup 0} oscillation frequency {Delta}m{sub d}. We use a sample of about 50,000 partially reconstructed {bar B}{sup 0} {yields} D*{sup +}{ell}{sup -}{bar {nu}}{sub {ell}} decays identified with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring at SLAC. The flavor of the other B meson in the event is determined from the charge of another high-momentum lepton.
  • We present a measurement of the BB s 0 lifetime in fully and partially reconstructed B s 0→D s -(Φπ⁻)X decays in 1.3 fb⁻¹ collected in pp̄ collisions at √s=1.96 TeV by the CDF II detector at the Fermilab Tevatron. We measure τ(B s 0)=1.518±0.041(stat)±0.027(syst) ps. The ratio of this result and the world average B⁰ lifetime yields τ(B s 0)/τ(B⁰)=0.99±0.03, which is in agreement with recent theoretical predictions.
  • We determine the relative branching fractions of semileptonic B decays to charmed final states. The measurement is performed on the recoil from a fully reconstructed B meson in a sample of 362x10{sup 6} BB pairs collected at the {upsilon}(4S) resonance with the BABAR detector. A simultaneous fit to a set of discriminating variables is performed on a sample of B{yields}DXl{sup -}{nu}{sub l} decays to determine the contributions from the different channels. We measure {gamma}(B{sup -}{yields}Dl{sup -}{nu}{sub l})/{gamma}(B{sup -}{yields}DXl{sup -}{nu}{sub l})=0.227{+-}0.014{+-}0.016 = , {gamma}(B{sup -}{yields}D*l{sup -}{nu}{sub l})/{gamma}(B{sup -}{yields}DXl{sup -}{nu}{sub l})=0.582{+-}0.018{+-}0.03 = 0, and {gamma}(B{sup -}{yields}D**l{sup -}{nu}{sub l})/{gamma}(B{sup -}{yields}DXl{sup -}{nu}{sub l})=0.191{+-}0.013{+-}0.0 =more » 19 for the charged B sample, and {gamma}(B{sup 0}{yields}Dl{sup -}{nu}{sub l})/{gamma}(B{sup 0}{yields}DXl{sup -}{nu}{sub l})=0.215{+-}0.016{+-}0.013 = , {gamma}(B{sup 0}{yields}D*l{sup -}{nu}{sub l})/{gamma}(B{sup 0}{yields}DXl{sup -}{nu}{sub l})=0.537{+-}0.031{+-}0.03 = 6, and {gamma}(B{sup 0}{yields}D**l{sup -}{nu}{sub l})/{gamma}(B{sup 0}{yields}DXl{sup -}{nu}{sub l})=0.248{+-}0.032{+-}0.0 = 30 for the neutral B sample, where uncertainties are statistical and systematic, respectively.« less
  • We report a measurement of the branching fractions for B{yields}D{sup (*)}({pi})l{sup -}{nu}{sub l} decays based on 341.1 fb{sup -1} of data collected at the {upsilon}(4S) resonance with the BABAR detector at the SLAC PEP-II e{sup +}e{sup -} storage rings. Events are tagged by fully reconstructing one of the B mesons in a hadronic decay mode. We obtain B(B{sup -}{yields}D{sup 0}l{sup -}{nu}{sub l})=(2.33{+-}0.09{sub stat}{+-}0.09{sub syst})%, B(B{sup -}{yields}D{sup *0}l{sup -}{nu}{sub l})=(5.83{+-}0.15{sub stat}{+-}0.30{sub syst})%, B(B{sup 0}{yields}D{sup +}l{sup -}{nu}{sub l})=(2.21{+-}0.11{sub stat}{+-}0.12{sub syst})%, B(B{sup 0}{yields}D{sup *+}l{sup -}{nu}{sub l})=(5.49{+-}0.16{sub stat}{+-}0.25{sub syst})%, B(B{sup -}{yields}D{sup +}{pi}{sup -}l{sup -}{nu}{sub l})=(0.42{+-}0.06{sub stat}{+-}0.03{sub syst})%, B(B{sup -}{yields}D{sup *+}{pi}{sup -}l{sup -}{nu}{sub l})=(0.59{+-}0.05{sub stat}{+-}0.04{submore » syst})%, B(B{sup 0}{yields}D{sup 0}{pi}{sup +}l{sup -}{nu}{sub l})=(0.43{+-}0.08{sub stat}{+-}0.03{sub syst})%, and B(B{sup 0}{yields}D{sup *0}{pi}{sup +}l{sup -}{nu}{sub l})=(0.48{+-}0.08{sub stat}{+-}0.04{sub syst})%.« less