pith. machine review for the scientific record. sign in

arxiv: 1209.3283 · v1 · submitted 2012-09-14 · ⚛️ nucl-ex · hep-ex

Recognition: unknown

Inclusive cross section and single-transverse-spin asymmetry for very forward neutron production in polarized p+p collisions at sqrt(s)=200 GeV

A. Adare , S. Afanasiev , C. Aidala , N. N. Ajitanand , Y. Akiba , H. Al-Bataineh , J. Alexander , K. Aoki
show 375 more authors
L. Aphecetche J. Asai E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann A. Bazilevsky S. Belikov R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell B. S. Chang W. C. Chang J.-L. Charvet S. Chernichenko C. Y. Chi M. Chiu I. J. Choi R. K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo Z. Citron B. A. Cole P. Constantin M. Csan\'ad T. Cs\"org\H{o} T. Dahms S. Dairaku K. Das G. David A. Denisov D. d'Enterria A. Deshpande E. J. Desmond O. Dietzsch A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees A. K. Dubey A. Durum D. Dutta V. Dzhordzhadze Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En'yo S. Esumi K. O. Eyser B. Fadem D. E. Fields M. Finger M. Finger Jr F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu I. Garishvili A. Glenn H. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-{\AA}. Gustafsson A. Hadj Henni J. S. Haggerty H. Hamagaki R. Han E. P. Hartouni K. Haruna E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback S. Huang T. Ichihara R. Ichimiya H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba D. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov D. Ivanischev B. V. Jacak J. Jia J. Jin B. M. Johnson K. S. Joo D. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin J. H. Kang J. Kapustinsky D. Kawall A. V. Kazantsev T. Kempel A. Khanzadeev K. M. Kijima J. Kikuchi B. I. Kim D. H. Kim D. J. Kim E. Kim S. H. Kim E. Kinney K. Kiriluk \'A. Kiss E. Kistenev J. Klay C. Klein-Boesing L. Kochenda B. Komkov M. Konno J. Koster A. Kozlov A. Kr\'al A. Kravitz G. J. Kunde K. Kurita M. Kurosawa M. J. Kweon Y. Kwon G. S. Kyle R. Lacey Y. S. Lai J. G. Lajoie D. Layton A. Lebedev D. M. Lee K. B. Lee T. Lee M. J. Leitch M. A. L. Leite B. Lenzi X. Li P. Liebing T. Li\v{s}ka A. Litvinenko H. Liu M. X. Liu B. Love D. Lynch C. F. Maguire Y. I. Makdisi A. Malakhov M. D. Malik V. I. Manko E. Mannel Y. Mao L. Ma\v{s}ek H. Masui F. Matathias M. McCumber P. L. McGaughey N. Means B. Meredith Y. Miake P. Mike\v{s} K. Miki A. Milov M. Mishra J. T. Mitchell A. K. Mohanty Y. Morino A. Morreale D. P. Morrison T. V. Moukhanova D. Mukhopadhyay J. Murata S. Nagamiya J. L. Nagle M. Naglis M. I. Nagy I. Nakagawa Y. Nakamiya T. Nakamura K. Nakano J. Newby M. Nguyen T. Niita R. Nouicer A. S. Nyanin E. O'Brien S. X. Oda C. A. Ogilvie M. Oka K. Okada Y. Onuki A. Oskarsson M. Ouchida K. Ozawa R. Pak A. P. T. Palounek V. Pantuev V. Papavassiliou J. Park W. J. Park S. F. Pate H. Pei J.-C. Peng H. Pereira V. Peresedov D. Yu. Peressounko C. Pinkenburg M. L. Purschke A. K. Purwar H. Qu J. Rak A. Rakotozafindrabe I. Ravinovich K. F. Read S. Rembeczki K. Reygers V. Riabov Y. Riabov D. Roach G. Roche S. D. Rolnick M. Rosati S. S. E. Rosendahl P. Rosnet P. Rukoyatkin P. Ru\v{z}i\v{c}ka V. L. Rykov B. Sahlmueller N. Saito T. Sakaguchi S. Sakai K. Sakashita V. Samsonov T. Sato S. Sawada K. Sedgwick J. Seele R. Seidl A. Yu. Semenov V. Semenov R. Seto D. Sharma I. Shein T.-A. Shibata K. Shigaki M. Shimomura K. Shoji P. Shukla A. Sickles C. L. Silva D. Silvermyr C. Silvestre K. S. Sim B. K. Singh C. P. Singh V. Singh M. Slune\v{c}ka 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 C. Suire A. Sukhanov J. Sziklai E. M. Takagui A. Taketani R. Tanabe Y. Tanaka K. Tanida M. J. Tannenbaum A. Taranenko P. Tarj\'an H. Themann T. L. Thomas M. Togawa A. Toia L. Tom\'a\v{s}ek Y. Tomita H. Torii R. S. Towell V-N. Tram I. Tserruya Y. Tsuchimoto C. Vale H. Valle H. W. van Hecke A. Veicht J. Velkovska R. V\'ertesi A. A. Vinogradov M. Virius V. Vrba E. Vznuzdaev X. R. Wang Y. Watanabe F. Wei J. Wessels S. N. White D. Winter C. L. Woody M. Wysocki W. Xie Y. L. Yamaguchi K. Yamaura R. Yang A. Yanovich J. Ying S. Yokkaichi G. R. Young I. Younus I. E. Yushmanov W. A. Zajc O. Zaudtke C. Zhang S. Zhou L. Zolin
Authors on Pith no claims yet
classification ⚛️ nucl-ex hep-ex
keywords neutronmeasuredcollisionsforwardproductionwereasymmetrycross
0
0 comments X
read the original abstract

The energy dependence of the single-transverse-spin asymmetry, A_N, and the cross section for neutron production at very forward angles were measured in the PHENIX experiment at RHIC for polarized p+p collisions at sqrt(s)=200 GeV. The neutrons were observed in forward detectors covering an angular range of up to 2.2 mrad. We report results for neutrons with momentum fraction of x_F=0.45 to 1.0. The energy dependence of the measured cross sections were consistent with x_F scaling, compared to measurements by an ISR experiment which measured neutron production in unpolarized p+p collisions at sqrt(s)=30.6--62.7 GeV. The cross sections for large x_F neutron production for p+p collisions, as well as those in e+p collisions measured at HERA, are described by a pion exchange mechanism. The observed forward neutron asymmetries were large, reaching A_N=-0.08+/-0.02 for x_F=0.8; the measured backward asymmetries, for negative x_F, were consistent with zero. The observed asymmetry for forward neutron production is discussed within the pion exchange framework, with interference between the spin-flip amplitude due to the pion exchange and nonflip amplitudes from all Reggeon exchanges. Within the pion exchange description, the measured neutron asymmetry is sensitive to the contribution of other Reggeon exchanges even for small amplitudes.

This paper has not been read by Pith yet.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.