$\eta$ meson production of high-energy nuclear collisions at NLO - INSPIRE

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$\eta$ meson production of high-energy nuclear collisions at NLO

Wei Dai
(
- Tsinghua U., Beijing
)
,
Xiao-Fang Chen
(
- Xuzhou Normal U.
)
,
Ben-Wei Zhang
(
- Hua-Zhong Normal U. and
- Hua-Zhong Normal U., LQLP
)
,
Enke Wang
(
- Hua-Zhong Normal U. and
- Hua-Zhong Normal U., LQLP
)

Jun 2, 2015

6 pages

Published in:

Phys.Lett.B 750 (2015) 390-395

Published: Sep 24, 2015

e-Print:

1506.00838 [nucl-th]

DOI:

10.1016/j.physletb.2015.09.053

View in:

ADS Abstract Service

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Abstract: (Elsevier)

The transverse momentum spectrum of η meson in relativistic heavy-ion collisions is studied at the Next-to-Leading Order (NLO) within the perturbative QCD, where the jet quenching effect in the QGP is incorporated with the effectively medium-modified η fragmentation functions using the higher-twist approach. We show that the theoretical simulations could give nice descriptions of PHENIX data on η meson in both p+p and central Au + Au collisions at the RHIC, and also provide numerical predictions of η spectra in central Pb + Pb collisions with sNN=2.76 TeV at the LHC. The ratios of η/π0 in p+p and in central Au + Au collisions at 200 GeV are found to overlap in a wide pT region, which matches well the measured ratio η/π0 by PHENIX. We demonstrate that, at the asymptotic region when pT→∞ the ratios of η/π0 in both Au + Au and p+p are almost determined only by quark jets fragmentation and thus approach to the one in e+e− scattering; in addition, the almost identical gluon (quark) contribution fractions to η and to π result in a rather moderate variation of η/π0 distribution at intermediate and high pT region in A+A relative to that in p+p ; while a slightly higher η/π0 at small pT in Au + Au can be observed due to larger suppression of gluon contribution fraction to π0 as compared to the one to η . The theoretical prediction for η/π0 at the LHC has also been presented.

Note:

7 pages, 8 figures, 2 typos corrected, revision for publication

meson: production
quark: jet
transverse momentum: momentum spectrum
heavy ion: scattering
jet: fragmentation
effect: quenching
jet: quenching
CERN LHC Coll
PHENIX
gluon

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Figures(8)

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