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Title: High transverse momentum {eta} meson production in p+p,d+Au, and Au+Au collisions at {radical}(s{sub NN})=200 GeV

Abstract

Inclusive transverse momentum spectra of {eta} mesons in the range p{sub T}{approx_equal}2-12 GeV/c have been measured at midrapidity (|{eta}|<0.35) by the PHENIX experiment at RHIC in p+p,d+Au, and Au+Au collisions at {radical}(s{sub NN})=200 GeV. The {eta} mesons are reconstructed through their {eta}{yields}{gamma} {gamma} channel for the three colliding systems as well as through the {eta}{yields}{pi}{sup 0}{pi}{sup +}{pi}{sup -} decay mode in p+p and d+Au collisions. The nuclear modification factor in d+Au collisions, R{sub dAu}(p{sub T}){approx_equal}1.0-1.1, suggests at most only modest p{sub T} broadening (''Cronin enhancement''). In central Au+Au reactions, the {eta} yields are significantly suppressed, with R{sub AuAu}(p{sub T}){approx_equal}0.2. The ratio of {eta} to {pi}{sup 0} yields is approximately constant as a function of p{sub T} for the three colliding systems in agreement with the high-p{sub T} world average of R{sub {eta}/{pi}{sup 0}}{approx_equal}0.5 in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions for a wide range of center-of-mass energies ({radical}(s{sub NN}){approx_equal}3-1800 GeV) as well as, for high scaled momentum x{sub p}, in e{sup +}e{sup -} annihilations at {radical}(s)=91.2 GeV. These results are consistent with a scenario where high-p{sub T} {eta} production in nuclear collisions at the Relativistic Heavy Ion Collider is largely unaffected by initial-state effects but where light-quark mesons ({pi}{sup 0},{eta}) aremore » equally suppressed due to final-state interactions of the parent partons in the dense medium produced in Au+Au reactions.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States) (and others)
Publication Date:
OSTI Identifier:
20991035
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevC.75.024909; (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; BROOKHAVEN RHIC; CENTER-OF-MASS SYSTEM; COLLISIONS; D QUARKS; ELECTRONS; ETA MESONS; FINAL-STATE INTERACTIONS; GEV RANGE; NUCLEI; PIONS MINUS; PIONS NEUTRAL; POSITRONS; TRANSVERSE MOMENTUM; U QUARKS

Citation Formats

Adler, S. S., Aronson, S. H., Chujo, T., David, G., Desmond, E. J., Drees, K. A., Ewell, L., Franz, A., Guryn, W., Haggerty, J. S., Harvey, M., Johnson, B. M., Kistenev, E., Kroon, P. J., Makdisi, Y. I., Mioduszewski, S., Mitchell, J. T., Morrison, D. P., O'Brien, E., and Pinkenburg, C. High transverse momentum {eta} meson production in p+p,d+Au, and Au+Au collisions at {radical}(s{sub NN})=200 GeV. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.024909.
Adler, S. S., Aronson, S. H., Chujo, T., David, G., Desmond, E. J., Drees, K. A., Ewell, L., Franz, A., Guryn, W., Haggerty, J. S., Harvey, M., Johnson, B. M., Kistenev, E., Kroon, P. J., Makdisi, Y. I., Mioduszewski, S., Mitchell, J. T., Morrison, D. P., O'Brien, E., & Pinkenburg, C. High transverse momentum {eta} meson production in p+p,d+Au, and Au+Au collisions at {radical}(s{sub NN})=200 GeV. United States. doi:10.1103/PHYSREVC.75.024909.
Adler, S. S., Aronson, S. H., Chujo, T., David, G., Desmond, E. J., Drees, K. A., Ewell, L., Franz, A., Guryn, W., Haggerty, J. S., Harvey, M., Johnson, B. M., Kistenev, E., Kroon, P. J., Makdisi, Y. I., Mioduszewski, S., Mitchell, J. T., Morrison, D. P., O'Brien, E., and Pinkenburg, C. Thu . "High transverse momentum {eta} meson production in p+p,d+Au, and Au+Au collisions at {radical}(s{sub NN})=200 GeV". United States. doi:10.1103/PHYSREVC.75.024909.
@article{osti_20991035,
title = {High transverse momentum {eta} meson production in p+p,d+Au, and Au+Au collisions at {radical}(s{sub NN})=200 GeV},
author = {Adler, S. S. and Aronson, S. H. and Chujo, T. and David, G. and Desmond, E. J. and Drees, K. A. and Ewell, L. and Franz, A. and Guryn, W. and Haggerty, J. S. and Harvey, M. and Johnson, B. M. and Kistenev, E. and Kroon, P. J. and Makdisi, Y. I. and Mioduszewski, S. and Mitchell, J. T. and Morrison, D. P. and O'Brien, E. and Pinkenburg, C.},
abstractNote = {Inclusive transverse momentum spectra of {eta} mesons in the range p{sub T}{approx_equal}2-12 GeV/c have been measured at midrapidity (|{eta}|<0.35) by the PHENIX experiment at RHIC in p+p,d+Au, and Au+Au collisions at {radical}(s{sub NN})=200 GeV. The {eta} mesons are reconstructed through their {eta}{yields}{gamma} {gamma} channel for the three colliding systems as well as through the {eta}{yields}{pi}{sup 0}{pi}{sup +}{pi}{sup -} decay mode in p+p and d+Au collisions. The nuclear modification factor in d+Au collisions, R{sub dAu}(p{sub T}){approx_equal}1.0-1.1, suggests at most only modest p{sub T} broadening (''Cronin enhancement''). In central Au+Au reactions, the {eta} yields are significantly suppressed, with R{sub AuAu}(p{sub T}){approx_equal}0.2. The ratio of {eta} to {pi}{sup 0} yields is approximately constant as a function of p{sub T} for the three colliding systems in agreement with the high-p{sub T} world average of R{sub {eta}/{pi}{sup 0}}{approx_equal}0.5 in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions for a wide range of center-of-mass energies ({radical}(s{sub NN}){approx_equal}3-1800 GeV) as well as, for high scaled momentum x{sub p}, in e{sup +}e{sup -} annihilations at {radical}(s)=91.2 GeV. These results are consistent with a scenario where high-p{sub T} {eta} production in nuclear collisions at the Relativistic Heavy Ion Collider is largely unaffected by initial-state effects but where light-quark mesons ({pi}{sup 0},{eta}) are equally suppressed due to final-state interactions of the parent partons in the dense medium produced in Au+Au reactions.},
doi = {10.1103/PHYSREVC.75.024909},
journal = {Physical Review. C, Nuclear Physics},
number = 2,
volume = 75,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}