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Title: Measurement of sigma(chi(c2)B(chi(c2) ---> J / psi gamma) / sigma(chi(c1)B(chi(c1) ---> J / psi gamma) in p anti-p collisions at s**(1/2) = 1.96-TeV

Abstract

The authors measure the ratio of cross section times branching fraction, {sigma}{sub {chi}c2}{beta}({chi}{sub c2} {yields} J/{psi}{gamma})/{sigma}{sub {chi}c1}{beta}({chi}{sub c1} {yields} J/{psi}{gamma}), in 1.1 fb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV. This measurement covers the kinematic range p{sub T} (J/{psi}) > 4.0 GeV/c, |{eta}(J/{psi})| < 1.0, and p{sub T}({gamma}) > 1.0 GeV/c. For events due to prompt processes, they find R{sub p} = 0.395 {+-} 0.016(stat.) {+-} 0.015(sys.). This result represents a significant improvement in precision over previous measurements of prompt {chi}{sub c1,2} hadroproduction.

Authors:
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Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
901965
Report Number(s):
FERMILAB-PUB-07-066-E
arXiv eprint number hep-ex/0703028; TRN: US200721%%372
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; BRANCHING RATIO; COLLISIONS; CROSS SECTIONS; MESONS; PARTICLE KINEMATICS; PARTICLE PRODUCTION; PROTON-ANTIPROTON INTERACTIONS; TEV RANGE 01-10; Experiment-HEP

Citation Formats

Abulencia, A., /Illinois U., Urbana, Adelman, J., /Chicago U., Affolder, T., /UC, Santa Barbara, Akimoto, T., /Tsukuba U., Albrow, M.G., /Fermilab, Ambrose, D., /Fermilab, Amerio, S., /Padua U., Amidei, D., /Michigan U., Anastassov, A., /Rutgers U., Piscataway, Anikeev, K., /Fermilab, Annovi, A., and /Frascati /Comenius U. Measurement of sigma(chi(c2)B(chi(c2) ---> J / psi gamma) / sigma(chi(c1)B(chi(c1) ---> J / psi gamma) in p anti-p collisions at s**(1/2) = 1.96-TeV. United States: N. p., 2007. Web.
Abulencia, A., /Illinois U., Urbana, Adelman, J., /Chicago U., Affolder, T., /UC, Santa Barbara, Akimoto, T., /Tsukuba U., Albrow, M.G., /Fermilab, Ambrose, D., /Fermilab, Amerio, S., /Padua U., Amidei, D., /Michigan U., Anastassov, A., /Rutgers U., Piscataway, Anikeev, K., /Fermilab, Annovi, A., & /Frascati /Comenius U. Measurement of sigma(chi(c2)B(chi(c2) ---> J / psi gamma) / sigma(chi(c1)B(chi(c1) ---> J / psi gamma) in p anti-p collisions at s**(1/2) = 1.96-TeV. United States.
Abulencia, A., /Illinois U., Urbana, Adelman, J., /Chicago U., Affolder, T., /UC, Santa Barbara, Akimoto, T., /Tsukuba U., Albrow, M.G., /Fermilab, Ambrose, D., /Fermilab, Amerio, S., /Padua U., Amidei, D., /Michigan U., Anastassov, A., /Rutgers U., Piscataway, Anikeev, K., /Fermilab, Annovi, A., and /Frascati /Comenius U. Thu . "Measurement of sigma(chi(c2)B(chi(c2) ---> J / psi gamma) / sigma(chi(c1)B(chi(c1) ---> J / psi gamma) in p anti-p collisions at s**(1/2) = 1.96-TeV". United States. doi:. https://www.osti.gov/servlets/purl/901965.
@article{osti_901965,
title = {Measurement of sigma(chi(c2)B(chi(c2) ---> J / psi gamma) / sigma(chi(c1)B(chi(c1) ---> J / psi gamma) in p anti-p collisions at s**(1/2) = 1.96-TeV},
author = {Abulencia, A. and /Illinois U., Urbana and Adelman, J. and /Chicago U. and Affolder, T. and /UC, Santa Barbara and Akimoto, T. and /Tsukuba U. and Albrow, M.G. and /Fermilab and Ambrose, D. and /Fermilab and Amerio, S. and /Padua U. and Amidei, D. and /Michigan U. and Anastassov, A. and /Rutgers U., Piscataway and Anikeev, K. and /Fermilab and Annovi, A. and /Frascati /Comenius U.},
abstractNote = {The authors measure the ratio of cross section times branching fraction, {sigma}{sub {chi}c2}{beta}({chi}{sub c2} {yields} J/{psi}{gamma})/{sigma}{sub {chi}c1}{beta}({chi}{sub c1} {yields} J/{psi}{gamma}), in 1.1 fb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV. This measurement covers the kinematic range p{sub T} (J/{psi}) > 4.0 GeV/c, |{eta}(J/{psi})| < 1.0, and p{sub T}({gamma}) > 1.0 GeV/c. For events due to prompt processes, they find R{sub p} = 0.395 {+-} 0.016(stat.) {+-} 0.015(sys.). This result represents a significant improvement in precision over previous measurements of prompt {chi}{sub c1,2} hadroproduction.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2007},
month = {Thu Mar 01 00:00:00 EST 2007}
}
  • We measure the ratio of cross section times branching fraction, R{sub p}={sigma}{sub {chi}{sub c}{sub 2}}B({chi}{sub c2}{yields}J/{psi}{gamma})/{sigma}{sub {chi}{sub c}{sub 1}}B({chi}{sub c1}{yields}J/{psi}{gamma}), in 1.1 fb{sup -1} of pp collisions at {radical}(s)=1.96 TeV. This measurement covers the kinematic range p{sub T}(J/{psi})>4.0 GeV/c, vertical bar {eta}(J/{psi})<1.0, and p{sub T}({gamma})>1.0 GeV/c. For events due to prompt processes, we find R{sub p}=0.395{+-}0.016(stat){+-}0.015(syst). This result represents a significant improvement in precision over previous measurements of prompt {chi}{sub c1,2} hadro production.
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  • The authors present the first observation of the baryon decay {Lambda}{sub b}{sup 0} {yields} {Lambda}{sub c}{sup +} {pi}{sup -} followed by {Lambda}{sub c}{sup +} {yields} pK{sup -} {pi}{sup +} in 106 pb{sup -1} p{bar p} collisions at {radical}s = 1.96 TeV in the CDF experiment. IN order to reduce systematic error, the measured rate for {Lambda}{sub b}{sup 0} decay is normalized to the kinematically similar meson decay {bar B}{sup 0} {yields} D{sup +}{pi}{sup -} followed by D{sup +} {yields} {pi}{sup +}K{sup -}{pi}{sup +}. They report the ratio of production cross sections ({sigma}) times the ratio of branching fractions ({Beta}) formore » the momentum region integrated above p{sub T} > 6 GeV/c and pseudorapidity range |{eta}| < 1.3: {sigma}(p{bar p} {yields} {Lambda}{sub b}{sup 0}X)/{sigma}(p{bar p} {yields} {bar B}{sup 0} X) x {Beta}({Lambda}{sub b}{sup 0} {yields} {Lambda}{sub c}{sup +}{pi}{sup -})/{Beta}({bar B}{sup 0} {yields} D{sup +}{pi}{sup -}) = 0.82 {+-} 0.08(stat) {+-} 0.11(syst) {+-} 0.22 ({Beta}({Lambda}{sub c}{sup +} {yields} pK{sup -} {pi}{sup +})).« less
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