dorsal/arxiv
View SchemaEnergy losses in the black disc regime and correlation effects in the STAR forward pion production in dAu collisions
| Authors | Leonid Frankfurt, Mark Strikman |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0603049 |
| URL | https://arxiv.org/abs/nucl-th/0603049 |
| DOI | 10.1016/j.physletb.2007.01.007 |
Abstract
We argue that in the small x processes, in the black disc QCD regime (BDR) a very forward parton propagating through the nuclear matter should loose a significant and increasing with energy and atomic number fraction of its initial energy as a result of dominance of inelastic interactions, causality and energy-momentum conservation. We evaluate these energy losses and find them to lead to the significant suppression of the forward jet production in the central NA collisions at collider energies with a moderate suppression of recoiling jet at central rapidities. We confront our expectations with the recent RHIC data of the STAR collaboration on the probability, $P$, for emission of at least one fast hadron at a central rapidity in association with production of a very forward high $p_t$ neutral pion in $pp$ and $dAu$ collisions. We calculate the A-dependence of $P$, and find that the data imply a strong suppression of leading pion production at central impact parameters. We also conclude that production of recoil jets in the hard subprocess is not suppressed providing further evidence for the dominance of peripheral collisions. Both features of the data are consistent with the onset of BDR. We suggest new phenomena and new observables to investigate BDR at RHIC and LHC.
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"abstract": "We argue that in the small x processes, in the black disc QCD regime (BDR) a\nvery forward parton propagating through the nuclear matter should loose a\nsignificant and increasing with energy and atomic number fraction of its\ninitial energy as a result of dominance of inelastic interactions, causality\nand energy-momentum conservation. We evaluate these energy losses and find them\nto lead to the significant suppression of the forward jet production in the\ncentral NA collisions at collider energies with a moderate suppression of\nrecoiling jet at central rapidities. We confront our expectations with the\nrecent RHIC data of the STAR collaboration on the probability, $P$, for\nemission of at least one fast hadron at a central rapidity in association with\nproduction of a very forward high $p_t$ neutral pion in $pp$ and $dAu$\ncollisions. We calculate the A-dependence of $P$, and find that the data imply\na strong suppression of leading pion production at central impact parameters.\nWe also conclude that production of recoil jets in the hard subprocess is not\nsuppressed providing further evidence for the dominance of peripheral\ncollisions. Both features of the data are consistent with the onset of BDR. We\nsuggest new phenomena and new observables to investigate BDR at RHIC and LHC.",
"arxiv_id": "nucl-th/0603049",
"authors": [
"Leonid Frankfurt",
"Mark Strikman"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1016/j.physletb.2007.01.007",
"title": "Energy losses in the black disc regime and correlation effects in the STAR forward pion production in dAu collisions",
"url": "https://arxiv.org/abs/nucl-th/0603049"
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