Measurements of identified particles at intermediate transverse momentum in the STAR experiment from Au + Au collisions at $\sqrt{s_{NN}}=200$ GeV - INSPIRE

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Measurements of identified particles at intermediate transverse momentum in the STAR experiment from Au + Au collisions at $\sqrt{s_{NN}}=200$ GeV

STAR and
STAR RICH

Collaborations

Jan, 2006

15 pages

e-Print:

nucl-ex/0601042 [nucl-ex]

Experiments:

BNL-RHIC-STAR

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Abstract:

Data for Au+Au collisions at

\sqrt{s_{NN}}=200

GeV are analyzed to determine the ratios of identified hadrons (

\pi

,

K

,

p

,

\Lambda

) as functions of collision centrality and transverse momentum (

p_T

). We find that ratios of anti-baryon to baryon yields are independent of

p_T

up to 5 GeV/c, a result inconsistent with results of theoretical pQCD calculations that predict a decrease due to a stronger contribution from valence quark scattering. For both strange and non-strange species, strong baryon enhancements relative to meson yields are observed as a function of collision centrality in the intermediate

p_T

region, leading to

p/\pi

and

\Lambda

/K ratios greater than unity. The increased

p_T

range offered by the

\Lambda

/K

^{0}_{S}

ratio allows a test of the applicability of various models developed for the intermediate

p_{T}

region. The physics implications of these measurements are discussed with regard to different theoretical models.

Note:

Submitted to PRC

25.75.Dw
25.75.-q
nucleus nucleus: colliding beams
scattering: heavy ion
gold
hadron: multiple production
pi
K
p
Lambda

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Figures(0)

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