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Can $\phi$ mesons give an answer to the baryon puzzle at RHIC?

S.S. Adler S. Afanasiev C. Aidala N.N. Ajitanand Y. Akiba A. Al-Jamel J. Alexander G. Alley R. Amirikas K. Aoki Laurent Aphecetche 1 J.B. Archuleta J.R. Archuleta R. Armendariz V. Armijo S.H. Aronson R. Averbeck T.C. Awes R. Azmoun V. Babintsev A. Baldisseri K.N. Barish P.D. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov Y. Berdnikov S. Bhagavatula M.T. Bjorndal M. Bobrek J.G. Boissevain S. Boose H. Borel S. Borenstein C.L. Britton Jr. M.L. Brooks D.S. Brown N. Brun 2 N. Bruner W.L. Bryan D. Bucher H. Buesching V. Bumazhnov G. Bunce J.M. Burward-Hoy S. Butsyk M.M. Cafferty X. Camard J.-S. Chai P. Chand W.C. Chang R.B. Chappell S. Chernichenko A. Chevel C.Y. Chi J. Chiba M. Chiu I.J. Choi J. Choi S. Chollet R.K. Choudhury T. Chujo V. Cianciolo D. Clark Y. Cobigo B.A. Cole M.P. Comets 3 P. Constantin M. Csanad T. Csorgo H. Cunitz Jean-Pierre Cussonneau 1 D.G. d'Enterria K. Das G. David F. Deak A. Debraine 4 H. Delagrange 1 A. Denisov A. Deshpande E.J. Desmond A. Devismes O. Dietzsch J.L. Drachenberg O. Drapier 4 A. Drees K.A. Drees R. Durietz A. Durum D. Dutta V. Dzhordzhadze M.A. Echave Y.V. Efremenko K. Elchenawi M.S. Emery A. Enokizono H. Enyo M.N. Ericson B. Espagnon 3 S. Esumi V. Evseev L. Ewell D.E. Fields C. Finck 1 F. Fleuret 4 S.L. Fokin B.D. Fox Z. Fraenkel S.S. Frank J.E. Frantz A. Franz A.D. Frawley J. Fried Y. Fukao S.-Y. Fung S. Gadrat 2 J. Gannon S. Garpman F. Gastaldi T.F. Gee Marie Germain 1 T.K. Ghosh P. Giannotti A. Glenn G. Gogiberidze M. Gonin 4 J. Gosset Y. Goto R. Granier de Cassagnac 4 N. Grau S.V. Greene M. Grosse Perdekamp W. Guryn H.-A. Gustafsson T. Hachiya J.S. Haggerty S.F. Hahn H. Hamagaki A.G. Hansen J. Harder G.W. Hart E.P. Hartouni M. Harvey K. Hasuko R. Hayano N. Hayashi X. He M. Heffner N. Heine T.K. Hemmick J.M. Heuser M. Hibino J.S. Hicks P. Hidas H. Hiejima J.C. Hill R. Hobbs W. Holzmann K. Homma B. Hong A. Hoover T. Horaguchi J.R. Hutchins R. Hutter T. Ichihara V.V. Ikonnikov K. Imai M. Inaba M. Inuzuka D. Isenhower L. Isenhower M. Ishihara M. Issah A. Isupov B.V. Jacak U. Jagadish W.Y. Jang Y. Jeong J. Jia O. Jinnouchi B.M. Johnson S.C. Johnson J.P. Jones Jr. K.S. Joo D. Jouan 3 S. Kahn F. Kajihara S. Kametani N. Kamihara A. Kandasamy M. Kaneta J.H. Kang M. Kann S.S. Kapoor K.V. Karadjev A. Karar S. Kato K. Katou T. Kawabata A. Kazantsev M.A. Kelley Steven Kelly B. Khachaturov A. Khanzadeev J. Kikuchi D.H. Kim D.J. Kim D.W. Kim E. Kim G.-B. Kim H.J. Kim E. Kinney A. Kiss E. Kistenev A. Kiyomichi K. Kiyoyama C. Klein-Boesing H. Kobayashi L. Kochenda V. Kochetkov D. Koehler T. Kohama R. Kohara B. Komkov M. Konno M. Kopytine D. Kotchetkov A. Kozlov V. Kozlov P. Kravtsov P.J. Kroon C.H. Kuberg G.J. Kunde V. Kuriatkov K. Kurita Y. Kuroki M.J. Kweon Y. Kwon G.S. Kyle R. Lacey V. Ladygin J.G. Lajoie Y. Le Bornec 3 A. Lebedev V.A. Lebedev S. Leckey D.M. Lee S. Lee M.J. Leitch M.A.L. Leite X.H. Li H. Lim A. Litvinenko M.X. Liu Yehan Liu J.D. Lopez C.F. Maguire Y.I. Makdisi A. Malakhov V.I. Manko Y. Mao L.J. Marek Gines Martinez Garcia 1 M.D. Marx H. Masui F. Matathias T. Matsumoto M.C. Mccain P.L. Mcgaughey R. Mckay E. Melnikov F. Messer Y. Miake N. Miftakhov J. Milan T.E. Miller A. Milov S. Mioduszewski R.E. Mischke G.C. Mishra J.T. Mitchell A.K. Mohanty B.C. Montoya J.A. Moore D.P. Morrison J.M. Moss F. Muehlbacher D. Mukhopadhyay M. Muniruzzaman J. Murata S. Nagamiya J.L. Nagle T. Nakamura B.K. Nandi M. Nara J. Newby S.A. Nikolaev P. Nilsson A.S. Nyanin J. Nystrand E. O'Brien C.A. Ogilvie H. Ohnishi I.D. Ojha H. Okada K. Okada M. Ono V. Onuchin A. Oskarsson I. Otterlund K. Oyama K. Ozawa D. Pal A.P.T. Palounek C. Pancake V.S. Pantuev V. Papavassiliou J. Park W.J. Park A. Parmar S.F. Pate C. Pearson H. Pei T. Peitzmann V. Penev J.-C. Peng H. Pereira V. Peresedov A. Pierson C. Pinkenburg R.P. Pisani F. Plasil R. Prigl G. Puill M.L. Purschke A.K. Purwar J.M. Qualls J. Rak S. Rankowitz I. Ravinovich K.F. Read M. Reuter K. Reygers V. Riabov Y. Riabov S.H. Robinson G. Roche 2 A. Romana 4 M. Rosati E. Roschin S.S.E. Rosendahl P. Rosnet 2 R. Ruggiero M. Rumpf V.L. Rykov S.S. Ryu M.E. Sadler N. Saito T. Sakaguchi M. Sakai S. Sakai V. Samsonov L. Sanfratello R. Santo H.D. Sato S. Sato S. Sawada Y. Schutz 1 V. Semenov R. Seto M.R. Shaw T.K. Shea I. Shein T.-A. Shibata K. Shigaki T. Shiina M. Shimomura A. Sickles C.L. Silva D. Silvermyr K.S. Sim C.P. Singh V. Singh F.W. Sippach M. Sivertz H.D. Skank G.A. Sleege D.E. Smith G. Smith M.C. Smith A. Soldatov R.A. Soltz W.E. Sondheim S.P. Sorensen I.V. Sourikova F. Staley P.W. Stankus E. Stenlund M. Stepanov A. Ster S.P. Stoll T. Sugitate J.P. Sullivan S. Takagi E.M. Takagui A. Taketani M. Tamai K.H. Tanaka Y. Tanaka K. Tanida M.J. Tannenbaum V. Tarakanov A. Taranenko P. Tarjan J.D. Tepe T.L. Thomas M. Togawa J. Tojo H. Torii R.S. Towell V.-N. Tram 4 V. Trofimov I. Tserruya Y. Tsuchimoto H. Tsuruoka S.K. Tuli H. Tydesjo N. Tyurin T.J. Uam H.W. van Hecke A.A. Vasiliev M. Vassent 2 J. Velkovska M. Velkovsky W. Verhoeven V. Veszpremi L. Villatte A.A. Vinogradov M.A. Volkov E. Vznuzdaev X.R. Wang Y. Watanabe S.N. White B.R. Whitus N. Willis 3 A.L. Wintenberg F.K. Wohn C.L. Woody W. Xie Y. Yang A. Yanovich S. Yokkaichi G.R. Young I.E. Yushmanov W.A. Zajc C. Zhang L. Zhang S. Zhou S.J. Zhou J. Zimanyi L. Zolin X. Zong
Abstract : The PHENIX experiment at RHIC has observed a large enhancement of baryon and anti-baryon production at ~ 2-5 GeV/c, compared to expectations from jet fragmentation. While a number of theoretical interpretations of the data are available, there is not yet a definitive answer to the “baryon puzzle”. We investigate the centrality dependence of -meson production at mid-rapidity in Au + Au collisions with $sqrt {^{s}NN}=200 GeV$. Comparison with the proton and anti-proton spectra reveal similar shapes, as expected for soft production described by hydrodynamics. However, the absolute yields show a different centrality dependence. The nuclear modification factors for $\phi$ are similar to those of pions, rather than (anti)protons that have similar mass. At intermediate , baryon/meson effects seem to be more important than the mass effects, in support of recombination models.
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Submitted on : Tuesday, January 24, 2006 - 4:38:28 PM
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S.S. Adler, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, et al.. Can $\phi$ mesons give an answer to the baryon puzzle at RHIC?. International Conference on Hard and Electromagnetic Probes of High Energy Nuclear Collisions - Hard Probes 2004, Nov 2004, Ericeira, Portugal. pp.317-322, ⟨10.1140/epjc/s2005-02326-6⟩. ⟨in2p3-00025489⟩

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