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Title: Measurement of Transverse Single-Spin Asymmetries for Midrapidity Production of Neutral Pions and Charged Hadrons in Polarized p+p Collisions at {radical}(s)=200 GeV

Abstract

Transverse single-spin asymmetries to probe the transverse-spin structure of the proton have been measured for neutral pions and nonidentified charged hadrons from polarized proton-proton collisions at midrapidity and {radical}(s)=200 GeV. The data cover a transverse momentum (p{sub T}) range 1.0-5.0 GeV/c for neutral pions and 0.5-5.0 GeV/c for charged hadrons, at a Feynman-x value of approximately zero. The asymmetries seen in this previously unexplored kinematic region are consistent with zero within errors of a few percent. In addition, the inclusive charged hadron cross section at midrapidity from 0.5<p{sub T}<7.0 GeV/c is presented and compared to next-to-leading order perturbative QCD (pQCD) calculations. Successful description of the unpolarized cross section above {approx}2 GeV/c suggests that pQCD is applicable in the interpretation of the asymmetry results in the relevant kinematic range.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States) [and others
Publication Date:
OSTI Identifier:
20699562
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 95; Journal Issue: 20; Other Information: DOI: 10.1103/PhysRevLett.95.202001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). PHENIX Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; CROSS SECTIONS; GEV RANGE 100-1000; INCLUSIVE INTERACTIONS; PIONS NEUTRAL; POLARIZED BEAMS; PROTON BEAMS; PROTON-PROTON INTERACTIONS; PROTONS; QUANTUM CHROMODYNAMICS; SPIN; TRANSVERSE MOMENTUM

Citation Formats

Adler, S.S., Aidala, C., 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., and O'Brien, E. Measurement of Transverse Single-Spin Asymmetries for Midrapidity Production of Neutral Pions and Charged Hadrons in Polarized p+p Collisions at {radical}(s)=200 GeV. United States: N. p., 2005. Web. doi:10.1103/PhysRevLett.95.202001.
Adler, S.S., Aidala, C., 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. Measurement of Transverse Single-Spin Asymmetries for Midrapidity Production of Neutral Pions and Charged Hadrons in Polarized p+p Collisions at {radical}(s)=200 GeV. United States. doi:10.1103/PhysRevLett.95.202001.
Adler, S.S., Aidala, C., 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., and O'Brien, E. Fri . "Measurement of Transverse Single-Spin Asymmetries for Midrapidity Production of Neutral Pions and Charged Hadrons in Polarized p+p Collisions at {radical}(s)=200 GeV". United States. doi:10.1103/PhysRevLett.95.202001.
@article{osti_20699562,
title = {Measurement of Transverse Single-Spin Asymmetries for Midrapidity Production of Neutral Pions and Charged Hadrons in Polarized p+p Collisions at {radical}(s)=200 GeV},
author = {Adler, S.S. and Aidala, C. 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.},
abstractNote = {Transverse single-spin asymmetries to probe the transverse-spin structure of the proton have been measured for neutral pions and nonidentified charged hadrons from polarized proton-proton collisions at midrapidity and {radical}(s)=200 GeV. The data cover a transverse momentum (p{sub T}) range 1.0-5.0 GeV/c for neutral pions and 0.5-5.0 GeV/c for charged hadrons, at a Feynman-x value of approximately zero. The asymmetries seen in this previously unexplored kinematic region are consistent with zero within errors of a few percent. In addition, the inclusive charged hadron cross section at midrapidity from 0.5<p{sub T}<7.0 GeV/c is presented and compared to next-to-leading order perturbative QCD (pQCD) calculations. Successful description of the unpolarized cross section above {approx}2 GeV/c suggests that pQCD is applicable in the interpretation of the asymmetry results in the relevant kinematic range.},
doi = {10.1103/PhysRevLett.95.202001},
journal = {Physical Review Letters},
number = 20,
volume = 95,
place = {United States},
year = {Fri Nov 11 00:00:00 EST 2005},
month = {Fri Nov 11 00:00:00 EST 2005}
}