Neutral Pion Production in Au+Au Collisions at s(NN)**(1/2) = 200-GeV

Abelev, B.I.; Aggarwal, M.M.; Ahammed, Z.; Alakhverdyants, A.V.; Anderson, B.D.; Arkhipkin, D.; Averichev, G.S.; Balewski, J.; Barannikova, O.; Barnby, L.S.

doi:10.1103/PhysRevC.80.044905

Neutral Pion Production in Au+Au Collisions at s(NN)**(1/2) = 200-GeV

STAR

Collaboration

Jul, 2009

10 pages

Published in:

Phys.Rev.C 80 (2009) 044905

e-Print:

0907.2721 [nucl-ex]

DOI:

10.1103/PhysRevC.80.044905

Experiments:

BNL-RHIC-STAR

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Abstract: (arXiv)

The results of mid-rapidity (

0 < y < 0.8

) neutral pion spectra over an extended transverse momentum range (

1 < p_T < 12

GeV/

c

) in

\sqrt{s_{NN}}

= 200 GeV Au+Au collisions, measured by the STAR experiment, are presented. The neutral pions are reconstructed from photons measured either by the STAR Barrel Electro-Magnetic Calorimeter (BEMC) or by the Time Projection Chamber (TPC) via tracking of conversion electron-positron pairs. Our measurements are compared to previously published

\pi^{\pm}

and

\pi^0

results. The nuclear modification factors

R_{\mathrm{CP}}

and

R_{\mathrm{AA}}

of

\pi^0

are also presented as a function of

p_T

. In the most central Au+Au collisions, the binary collision scaled

\pi^0

yield at high

p_T

is suppressed by a factor of about 5 compared to the expectation from the yield of p+p collisions. Such a large suppression is in agreement with previous observations for light quark mesons and is consistent with the scenario that partons suffer considerable energy loss in the dense medium formed in central nucleus-nucleus collisions at RHIC.

Note:

10 pages, 9 figures. submitted to Physical Review C

25.75.Nq
25.75.Gz
OSG : STAR
pi0: hadroproduction
pi0: radiative decay
pi0: yield
heavy ion: scattering
gold
STAR
Brookhaven RHIC Coll

References(85)

Figures(9)

Superdense Matter: Neutrons Or Asymptotically Free Quarks?

John C. Collins
(
- Cambridge U.
)
,
M.J. Perry
(
- Cambridge U.
)

- Phys.Rev.Lett. 34 (1975) 1353
•
DOI:
- 10.1103/PhysRevLett.34.1353

Quantum Chromodynamics and the Theory of Superdense Matter

Edward V. Shuryak
(
- Novosibirsk, IYF
)

- Phys.Rept. 61 (1980) 71-158
•
DOI:
- 10.1016/0370-1573(80)90105-2

QCD and Instantons at Finite Temperature

- Rev.Mod.Phys. 53 (1981) 43
•
DOI:
- 10.1103/RevModPhys.53.43

A Monte Carlo Study of SU(2) Yang-Mills Theory at Finite Temperature

Larry D. McLerran
(
- SLAC
)
,
Benjamin Svetitsky
(
- SLAC
)

- Phys.Lett.B 98 (1981) 195,
- In *Rebbi, C. ( Ed.): Lattice Gauge Theories and Monte Carlo Simulations*, 283-286. ( Phys. Lett. B98 (1981) 195-198) and SLAC Stanford - SLAC-PUB-2572 (80,REC.SEP.) 12p
•
DOI:
- 10.1016/0370-2693(81)90986-2

Experimental and theoretical challenges in the search for the quark gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions

STAR

Collaboration

•

John Adams
(
- Birmingham U.
)

et al.

- Nucl.Phys.A 757 (2005) 102-183
•
e-Print:
- nucl-ex/0501009
•
DOI:
- 10.1016/j.nuclphysa.2005.03.085

The Time delay signature of quark - gluon plasma formation in relativistic nuclear collisions

Dirk H. Rischke
(
- Columbia U.
)
,
Miklos Gyulassy
(
- Columbia U.
)

- Nucl.Phys.A 608 (1996) 479-512
•
e-Print:
- nucl-th/9606039
•
DOI:
- 10.1016/0375-9474(96)00259-X

Influence of Bose-Einstein statistics on the anti-proton proton annihilation process

Gerson Goldhaber
(
- UC, Berkeley and
- LBL, Berkeley
)
,
Sulamith Goldhaber
(
- UC, Berkeley and
- LBL, Berkeley
)
,
Won-Yong Lee
(
- UC, Berkeley and
- LBL, Berkeley
)
,
Abraham Pais
(
- UC, Berkeley and
- LBL, Berkeley
)

- Phys.Rev. 120 (1960) 300-312,
•
DOI:
- 10.1103/PhysRev.120.300

A New type of interferometer for use in radio astronomy

R. Hanbury Brown
(
- Jodrell Bank
)
,
R.Q. Twiss

- Phil.Mag.Ser.7 45 (1954) 663-682
•
DOI:
- 10.1080/14786440708520475

A Test of a new type of stellar interferometer on Sirius

R. Hanbury Brown
(
- Manchester U.
)
,
R.Q. Twiss

- Nature 178 (1956) 1046-1048
•
DOI:
- 10.1038/1781046a0

Progress in correlation femtoscopy

R. Lednicky
(
- Dubna, JINR and
- Prague, Inst. Phys.
)

Femtoscopy in relativistic heavy ion collisions

Michael Annan Lisa
(
- Ohio State U.
)
,
Scott Pratt
(
- Michigan State U.
)
,
Ron Soltz
(
- LLNL, Livermore
)
,
Urs Wiedemann
(
- CERN
)

- Ann.Rev.Nucl.Part.Sci. 55 (2005) 357-402
•
e-Print:
- nucl-ex/0505014
•
DOI:
- 10.1146/annurev.nucl.55.090704.151533

Correlations of identical particles emitted by highly excited nuclei

G.I. Kopylov
(
- Dubna, JINR
)
,
M.I. Podgoretsky
(
- Dubna, JINR
)

- Sov.J.Nucl.Phys. 15 (1972) 219-223,
- Yad.Fiz. 15 (1972) 392-399

Two particle correlations in relativistic heavy ion collisions

Ulrich W. Heinz
(
- CERN and
- Regensburg U.
)
,
Barbara V. Jacak
(
- SUNY, Stony Brook
)

- Ann.Rev.Nucl.Part.Sci. 49 (1999) 529-579
•
e-Print:
- nucl-th/9902020
•
DOI:
- 10.1146/annurev.nucl.49.1.529

Pion Interferometry in Ultrarelativistic Heavy Ion Collisions

- Phys.Rev.C 37 (1988) 1896-1900,
- In *Hirschegg 1988, Proceedings, Gross properties of nuclei and nuclear excitations* 157-166
•
DOI:
- 10.1103/PhysRevC.37.1896