Hadronization scheme dependence of long-range azimuthal harmonics in high energy p + A reactions

Angelo Esposito (Department of Physics, Columbia University, 538 West 120th Street, New York, NY 10027, USA) ; Miklos Gyulassy (Department of Physics, Columbia University, 538 West 120th Street, New York, NY 10027, USA)

We compare the distortion effects of three popular final-state hadronization schemes. We show how hadronization modifies the initial-state gluon correlations in high energy p + A collisions. The three models considered are (1) LPH: local parton–hadron duality, (2) CPR: collinear parton–hadron resonance independent fragmentation, and (3) LUND: color string hadronization. The strong initial-state azimuthal asymmetries are generated using the GLVB model for non-abelian gluon bremsstrahlung, assuming a saturation scale Qsat=2 GeV. Long-range elliptic and triangular harmonics for the final hadron pairs are compared based on the three hadronization schemes. Our analysis shows that the process of hadronization causes major distortions of the partonic azimuthal harmonics for transverse momenta at least up to pT=3 GeV. In particular, they appear to be greatly reduced for pT<1÷2 GeV.

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      "value": "We compare the distortion effects of three popular final-state hadronization schemes. We show how hadronization modifies the initial-state gluon correlations in high energy p + A collisions. The three models considered are (1) LPH: local parton\u2013hadron duality, (2) CPR: collinear parton\u2013hadron resonance independent fragmentation, and (3) LUND: color string hadronization. The strong initial-state azimuthal asymmetries are generated using the GLVB model for non-abelian gluon bremsstrahlung, assuming a saturation scale <math><msub><mrow><mi>Q</mi></mrow><mrow><mi>sat</mi></mrow></msub><mo>=</mo><mn>2</mn><mtext> </mtext><mtext>GeV</mtext></math>. Long-range elliptic and triangular harmonics for the final hadron pairs are compared based on the three hadronization schemes. Our analysis shows that the process of hadronization causes major distortions of the partonic azimuthal harmonics for transverse momenta at least up to <math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub><mo>=</mo><mn>3</mn><mtext> </mtext><mtext>GeV</mtext></math>. In particular, they appear to be greatly reduced for <math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub><mo>&lt;</mo><mn>1</mn><mo>\u00f7</mo><mn>2</mn><mtext> </mtext><mtext>GeV</mtext></math>."
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Published on:
16 June 2015
Publisher:
Elsevier
Published in:
Physics Letters B , Volume 747 C (2015)

Pages 433-440
DOI:
https://doi.org/10.1016/j.physletb.2015.06.037
Copyrights:
The Authors
Licence:
CC-BY-3.0

Fulltext files: