Correlation structures from soft and semi-hard components in p - p collisions at s**(1/2) = 200-GeV - INSPIRE

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Correlation structures from soft and semi-hard components in p - p collisions at s**(1/2) = 200-GeV

STAR

Collaboration

•

R.J. Porter
(
- Washington U., Seattle
)

2005

7 pages

Part of Proceedings, 34th International Symposium on Multiparticle dynamics (ISMD 2004) : Rohnert Park, USA, July 26-August 1, 2004

Published in:

Acta Phys.Polon.B 36 (2005) 353-359

Contribution to:

- ISMD 2004

Experiments:

BNL-RHIC-STAR

reference search26 citations

Citations per year

Abstract:

We present preliminary two-particle correlations for unidentified had\-rons in

p

--

p

collisions at

\sqrt{s}=

200 GeV. On two-particle transverse rapidity space

y_{\rm t} \otimes y_{\rm t}

two distinct regions of correlated pairs are observed: a peaked structure at low

y_{\rm t}

(

p_{\rm t}\leq 0.4

GeV/

c

) and a broad structure at higher

y_{\rm t}

, where the correlation is distributed as a

2D

Gaussian centered at

y_{\rm t1}=y_{\rm t2}\simeq 2.8

(

p_{\rm t1},p_{\rm t2} \simeq 1.2

GeV/

c

). We select those regions separately, projecting correlations onto momentum-{\em difference} variables (

\eta_{{\it\Delta}},\phi_{{\it\Delta}}

), and observe structures interpretable in the context of string and parton fragmentations from soft and semi-hard components of

p

--

p

collisions.

24.60.Ky
13.85.Hd
25.75.Gz
13.87.Fh

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