The Baryon Anomaly: Evidence for Color Transparency and Direct Hadron Production at RHIC

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We show that the QCD color transparency of higher-twist contributions to inclusive hadroproduction cross sections, where baryons are produced directly in a short distance subprocess, can explain several remarkable features of high-p{sub T} baryon production in heavy ion collisions which have recently been observed at RHIC: (a) the anomalous increase of the proton-to-pion ratio with centrality (b): the increased power-law fall-off at fixed x{sub T} = 2p{sub T}/{radical}s of the charged particle production cross section in high centrality nuclear collisions, and (c): the anomalous decrease of the number of same-side hadrons produced in association with a proton trigger as the ... continued below

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Brodsky, Stanley J. & Sickles, Anne April 30, 2008.

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We show that the QCD color transparency of higher-twist contributions to inclusive hadroproduction cross sections, where baryons are produced directly in a short distance subprocess, can explain several remarkable features of high-p{sub T} baryon production in heavy ion collisions which have recently been observed at RHIC: (a) the anomalous increase of the proton-to-pion ratio with centrality (b): the increased power-law fall-off at fixed x{sub T} = 2p{sub T}/{radical}s of the charged particle production cross section in high centrality nuclear collisions, and (c): the anomalous decrease of the number of same-side hadrons produced in association with a proton trigger as the centrality increases. We show that correlations between opposite-side hyperons and kaons can provide a clear signature of higher-twist contributions. These phenomena emphasize the importance of understanding hadronization at the amplitude level in QCD illustrate how heavy ion collisions can provide sensitive tools for interpreting and testing fundamental properties of QCD.

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  • Journal Name: Physics Letters B

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  • Report No.: SLAC-PUB-13224
  • Grant Number: AC02-76SF00515
  • DOI: 10.1016/j.physletb.2008.07.108 | External Link
  • Office of Scientific & Technical Information Report Number: 927788
  • Archival Resource Key: ark:/67531/metadc895801

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  • April 30, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 22, 2016, 8:55 p.m.

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Brodsky, Stanley J. & Sickles, Anne. The Baryon Anomaly: Evidence for Color Transparency and Direct Hadron Production at RHIC, article, April 30, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc895801/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.