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Title: Measurement of B({upsilon}(5S){yields}B{sub s}{sup (*)}B{sub s}{sup (*)}) using {phi} mesons

Abstract

Knowledge of the B{sub s} decay fraction of the {upsilon}(5S) resonance, f{sub S}, is important for B{sub s} meson studies at the {upsilon}(5S) energy. Using a data sample collected by the CLEO III detector at CESR consisting of 0.423 fb{sup -1} on the {upsilon}(5S) resonance, 6.34 fb{sup -1} on the {upsilon}(4S) and 2.32 fb{sup -1} in the continuum below the {upsilon}(4S), we measure B({upsilon}(5S){yields}{phi}X)=(13.8{+-}0.7{sub -1.5}{sup +2.3})% and B({upsilon}(4S){yields}{phi}X)=(7.1{+-}0.1{+-}0.6)%; the ratio of the two rates is (1.9{+-}0.1{sub -0.2}{sup +0.3}). This is the first measurement of the {phi} meson yield from the {upsilon}(5S). Using these rates, and a model dependent estimate of B(B{sub s}{yields}{phi}X), we determine f{sub S}=(24.6{+-}2.9{sub -5.3}{sup +11.0})%. We also update our previous independent measurement of f{sub S} made using the inclusive D{sub s} yields to now be (16.8{+-}2.6{sub -3.4}{sup +6.7})%, due to a better estimate of the number of hadronic events. We also report the total {upsilon}(5S) hadronic cross section above continuum to be {sigma}(e{sup +}e{sup -}{yields}{upsilon}(5S))=(0.301{+-}0.002{+-}0.039) nb. This allows us to extract the fraction of B mesons as (58.9{+-}10.0{+-}9.2)%, equal to 1-f{sub S}. Averaging the three methods gives a model dependent result of f{sub S}=(21{sub -3}{sup +6})%.

Authors:
; ; ; ; ;  [1]; ; ; ; ;  [2]; ; ; ; ; ;  [3]; ; ;  [4]
  1. Purdue University, West Lafayette, Indiana 47907 (United States)
  2. Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
  3. University of Rochester, Rochester, New York 14627 (United States)
  4. Southern Methodist University, Dallas, Texas 75275 (United States) (and others)
Publication Date:
OSTI Identifier:
20933195
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.75.012002; (c) 2007 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; ANNIHILATION; B MESONS; CESR STORAGE RING; CROSS SECTIONS; ELECTRON-POSITRON INTERACTIONS; ELECTRONS; MULTIPARTICLE SPECTROMETERS; PARTICLE DECAY; PARTICLE IDENTIFICATION; POSITRONS

Citation Formats

Huang, G. S., Miller, D. H., Pavlunin, V., Sanghi, B., Shipsey, I. P. J., Xin, B., Adams, G. S., Anderson, M., Cummings, J. P., Danko, I., Napolitano, J., He, Q., Insler, J., Muramatsu, H., Park, C. S., Thorndike, E. H., Yang, F., Coan, T. E., Gao, Y. S., and Liu, F. Measurement of B({upsilon}(5S){yields}B{sub s}{sup (*)}B{sub s}{sup (*)}) using {phi} mesons. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.012002.
Huang, G. S., Miller, D. H., Pavlunin, V., Sanghi, B., Shipsey, I. P. J., Xin, B., Adams, G. S., Anderson, M., Cummings, J. P., Danko, I., Napolitano, J., He, Q., Insler, J., Muramatsu, H., Park, C. S., Thorndike, E. H., Yang, F., Coan, T. E., Gao, Y. S., & Liu, F. Measurement of B({upsilon}(5S){yields}B{sub s}{sup (*)}B{sub s}{sup (*)}) using {phi} mesons. United States. doi:10.1103/PHYSREVD.75.012002.
Huang, G. S., Miller, D. H., Pavlunin, V., Sanghi, B., Shipsey, I. P. J., Xin, B., Adams, G. S., Anderson, M., Cummings, J. P., Danko, I., Napolitano, J., He, Q., Insler, J., Muramatsu, H., Park, C. S., Thorndike, E. H., Yang, F., Coan, T. E., Gao, Y. S., and Liu, F. Mon . "Measurement of B({upsilon}(5S){yields}B{sub s}{sup (*)}B{sub s}{sup (*)}) using {phi} mesons". United States. doi:10.1103/PHYSREVD.75.012002.
@article{osti_20933195,
title = {Measurement of B({upsilon}(5S){yields}B{sub s}{sup (*)}B{sub s}{sup (*)}) using {phi} mesons},
author = {Huang, G. S. and Miller, D. H. and Pavlunin, V. and Sanghi, B. and Shipsey, I. P. J. and Xin, B. and Adams, G. S. and Anderson, M. and Cummings, J. P. and Danko, I. and Napolitano, J. and He, Q. and Insler, J. and Muramatsu, H. and Park, C. S. and Thorndike, E. H. and Yang, F. and Coan, T. E. and Gao, Y. S. and Liu, F.},
abstractNote = {Knowledge of the B{sub s} decay fraction of the {upsilon}(5S) resonance, f{sub S}, is important for B{sub s} meson studies at the {upsilon}(5S) energy. Using a data sample collected by the CLEO III detector at CESR consisting of 0.423 fb{sup -1} on the {upsilon}(5S) resonance, 6.34 fb{sup -1} on the {upsilon}(4S) and 2.32 fb{sup -1} in the continuum below the {upsilon}(4S), we measure B({upsilon}(5S){yields}{phi}X)=(13.8{+-}0.7{sub -1.5}{sup +2.3})% and B({upsilon}(4S){yields}{phi}X)=(7.1{+-}0.1{+-}0.6)%; the ratio of the two rates is (1.9{+-}0.1{sub -0.2}{sup +0.3}). This is the first measurement of the {phi} meson yield from the {upsilon}(5S). Using these rates, and a model dependent estimate of B(B{sub s}{yields}{phi}X), we determine f{sub S}=(24.6{+-}2.9{sub -5.3}{sup +11.0})%. We also update our previous independent measurement of f{sub S} made using the inclusive D{sub s} yields to now be (16.8{+-}2.6{sub -3.4}{sup +6.7})%, due to a better estimate of the number of hadronic events. We also report the total {upsilon}(5S) hadronic cross section above continuum to be {sigma}(e{sup +}e{sup -}{yields}{upsilon}(5S))=(0.301{+-}0.002{+-}0.039) nb. This allows us to extract the fraction of B mesons as (58.9{+-}10.0{+-}9.2)%, equal to 1-f{sub S}. Averaging the three methods gives a model dependent result of f{sub S}=(21{sub -3}{sup +6})%.},
doi = {10.1103/PHYSREVD.75.012002},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • We report the first observation of B{sub s}{sup 0}{yields}{psi}(2S){phi} decay in pp collisions at {radical}(s)=1.96 TeV using 360 pb{sup -1} of data collected by the CDF II detector at the Fermilab Tevatron. We observe 20.2{+-}5.0 and 12.3{+-}4.1 B{sub s}{sup 0}{yields}{psi}(2S){phi} candidates, in {psi}(2S){yields}{mu}{sup +}{mu}{sup -} and {psi}(2S){yields}J/{psi}{pi}{sup +}{pi}{sup -} decay modes, respectively. We present a measurement of the relative branching fraction B(B{sub s}{sup 0}{yields}{psi}(2S){phi})/B(B{sub s}{sup 0}{yields}J/{psi}{phi})=0.52{+-}0.13(stat){+-}0.04= (syst){+-}0.06(BR) using the {psi}(2S){yields}{mu}{sup +}{mu}{sup -} decay mode.
  • We describe a method that provides a model independent measurement of the B{sub S} fraction in {upsilon}(5S) resonance decays, f{sub S}, using the relative rates of like-sign versus opposite-sign dileptons; the like-sign leptons result from B{sup 0} and B{sub S} mixing. In addition, we show that determining the rates of single, double and triple D{sub S}{sup {+-}} mesons provides an alternative way of finding f{sub S}.
  • The inclusive production of D{sub s}, D{sup 0}, and J/{psi} mesons is studied using a 1.86 fb{sup -1} data sample collected on the {upsilon}(5S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. The number of bb events in this {upsilon}(5S) data sample is determined. We measure the branching fractions B({upsilon}(5S){yields}D{sub s}X)/2=(23.6{+-}1.2{+-}3.6)%, B({upsilon}(5S){yields}D{sup 0}X)/2=(53.8{+-}2.0{+-}3.4)%, and B({upsilon}(5S){yields}J/{psi}X)/2=(1.030{+-}0.080{+-}0.067)%. From the D{sub s} and D{sup 0} inclusive branching fractions the ratio f{sub s}=(18.0{+-}1.3{+-}3.2)% of B{sub s}{sup (*)}B{sub s}{sup (*)} to the total bb quark pair production at the {upsilon}(5S) energy is obtained in a model-dependent way.
  • We have searched for B{sub s}{sup 0{yields}}hh decays, where h stands for a charged or neutral kaon, or a charged pion. These results are based on a 23.6 fb{sup -1} data sample collected with the Belle detector on the {Upsilon}(5S) resonance at the KEKB asymmetric-energy e{sup +}e{sup -} collider, containing 1.25x10{sup 6} B{sub s}{sup (*)}B{sub s}{sup (*)} events. We observe the decay B{sub s}{sup 0{yields}}K{sup +}K{sup -} and measure its branching fraction, B(B{sub s}{sup 0{yields}}K{sup +}K{sup -})=[3.8{sub -0.9}{sup +1.0}(stat){+-}0.5(syst){+-}0.5(f{sub s})]x10{sup -5}. The first error is statistical, the second is systematic, and the third error is due to the uncertainty inmore » the B{sub s}{sup 0} production fraction in e{sup +}e{sup -{yields}}bb events. No significant signals are seen in other decay modes, and we set upper limits at the 90% confidence level: B(B{sub s}{sup 0{yields}}K{sup -{pi}+})<1.2x10{sup -5}, B(B{sub s}{sup 0{yields}{pi}+{pi}-})<2.6x10{sup -5}, and B(B{sub s}{sup 0{yields}}K{sup 0}K{sup 0})<6.6x10{sup -5}.« less