Double helicity asymmetry in inclusive midrapidity pi(0) production for polarized p+p collisions at root s=200 GeV

Research output: Contribution to journalArticle

Abstract

We present a measurement of the double longitudinal spin asymmetry in inclusive pi(0) production in polarized proton-proton collisions at roots=200 GeV. The data were taken at the Relativistic Heavy Ion Collider with average beam polarizations of 0.27. The measurements are the first in a program to study the longitudinal spin structure of the proton, using strongly interacting probes, at collider energies. The asymmetry is presented for transverse momenta 1-5 GeV/c at midrapidity, where next-to-leading-order perturbative quantum chromodynamic (NLO pQCD) calculations well describe the unpolarized cross section. The observed asymmetry is small and is compared to a NLO pQCD calculation with a range of polarized gluon distributions.

Details

Authors
  • SS Adler
  • S Afanasiev
  • C Aidala
  • NN Ajitanand
  • Y Akiba
  • A Al-Jamel
  • J Alexander
  • K Aoki
  • L Aphecetche
  • R Armendariz
  • SH Aronson
  • R Averbeck
  • TC Awes
  • V Babintsev
  • A Baldisseri
  • KN Barish
  • PD Barnes
  • B Bassalleck
  • S Bathe
  • S Batsouli
  • V Baublis
  • F Bauer
  • A Bazilevsky
  • S Belikov
  • MT Bjorndal
  • JG Boissevain
  • H Borel
  • ML Brooks
  • DS Brown
  • N Bruner
  • D Bucher
  • H Buesching
  • V Bumazhnov
  • G Bunce
  • JM Burward-Hoy
  • S Butsyk
  • X Camard
  • P Chand
  • WC Chang
  • S Chernichenko
  • CY Chi
  • J Chiba
  • M Chiu
  • IJ Choi
  • RK Choudhury
  • T Chujo
  • V Cianciolo
  • Y Cobigo
  • BA Cole
  • MP Comets
  • P Constantin
  • M Csanad
  • T Csorgo
  • JP Cussonneau
  • D d'Enterria
  • K Das
  • G David
  • F Deak
  • H Delagrange
  • A Denisov
  • A Deshpande
  • EJ Desmond
  • A Devismes
  • O Dietzsch
  • JL Drachenberg
  • O Drapier
  • A Drees
  • A Durum
  • D Dutta
  • V Dzhordzhadze
  • YV Efremenko
  • H En'yo
  • B Espagnon
  • S Esumi
  • DE Fields
  • C Finck
  • F Fleuret
  • SL Fokin
  • BD Fox
  • Z Fraenkel
  • JE Frantz
  • A Franz
  • AD Frawley
  • Y Fukao
  • SY Fung
  • S Gadrat
  • M Germain
  • A Glenn
  • M Gonin
  • J Gosset
  • Y Goto
  • RG de Cassagnac
  • N Grau
  • SV Greene
  • MG Perdekamp
  • Hans-Åke Gustafsson
  • T Hachiya
  • JS Haggerty
  • H Hamagaki
  • AG Hansen
  • EP Hartouni
  • M Harvey
  • K Hasuko
  • R Hayano
  • X He
  • M Heffner
  • TK Hemmick
  • JM Heuser
  • P Hidas
  • H Hiejima
  • JC Hill
  • R Hobbs
  • W Holzmann
  • K Homma
  • B Hong
  • A Hoover
  • T Horaguchi
  • T Ichihara
  • VV Ikonnikov
  • K Imai
  • M Inaba
  • M Inuzuka
  • D Isenhower
  • L Isenhower
  • M Ishihara
  • M Issah
  • A Isupov
  • BV Jacak
  • J Jia
  • O Jinnouchi
  • BM Johnson
  • SC Johnson
  • KS Joo
  • D Jouan
  • F Kajihara
  • S Kametani
  • N Kamihara
  • M Kaneta
  • JH Kang
  • K Katou
  • T Kawabata
  • A Kazantsev
  • S Kelly
  • B Khachaturov
  • A Khanzadeev
  • J Kikuchi
  • DJ Kim
  • E Kim
  • GB Kim
  • HJ Kim
  • E Kinney
  • A Kiss
  • E Kistenev
  • A Kiyomichi
  • C Klein-Boesing
  • H Kobayashi
  • V Kochetkov
  • R Kohara
  • B Komkov
  • M Konno
  • D Kotchetkov
  • A Kozlov
  • PJ Kroon
  • CH Kuberg
  • GJ Kunde
  • K Kurita
  • MJ Kweon
  • Y Kwon
  • GS Kyle
  • R Lacey
  • JG Lajoie
  • Y Le Bornec
  • A Lebedev
  • S Leckey
  • DM Lee
  • MJ Leitch
  • MAL Leite
  • X Li
  • XH Li
  • H Lim
  • A Litvinenko
  • MX Liu
  • CF Maguire
  • YI Makdisi
  • A Malakhov
  • VI Manko
  • Y Mao
  • G Martinez
  • H Masui
  • F Matathias
  • T Matsumoto
  • MC McCain
  • PL McGaughey
  • Y Miake
  • TE Miller
  • A Milov
  • S Mioduszewski
  • GC Mishra
  • JT Mitchell
  • AK Mohanty
  • DP Morrison
  • JM Moss
  • D Mukhopadhyay
  • M Muniruzzaman
  • S Nagamiya
  • JL Nagle
  • T Nakamura
  • J Newby
  • AS Nyanin
  • Joakim Nystrand
  • E O'Brien
  • CA Ogilvie
  • H Ohnishi
  • ID Ojha
  • H Okada
  • K Okada
  • K Oyama
  • K Ozawa
  • D Pal
  • APT Palounek
  • V Pantuev
  • V Papavassiliou
  • J Park
  • WJ Park
  • SF Pate
  • H Pei
  • V Penev
  • JC Peng
  • H Pereira
  • V Peresedov
  • A Pierson
  • C Pinkenburg
  • RP Pisani
  • ML Purschke
  • AK Purwar
  • J Qualls
  • J Rak
  • I Ravinovich
  • KF Read
  • M Reuter
  • K Reygers
  • V Riabov
  • Y Riabov
  • G Roche
  • A Romana
  • M Rosati
  • Sarah Rosendahl
  • P Rosnet
  • VL Rykov
  • SS Ryu
  • N Saito
  • T Sakaguchi
  • S Sakai
  • V Samsonov
  • L Sanfratello
  • R Santo
  • HD Sato
  • S Sato
  • S Sawada
  • Y Schutz
  • V Semenov
  • R Seto
  • TK Shea
  • I Shein
  • TA Shibata
  • K Shigaki
  • M Shimomura
  • A Sickles
  • CL Silva
  • D Silvermyr
  • KS Sim
  • A Soldatov
  • RA Soltz
  • WE Sondheim
  • S Sorensen
  • IV Sourikova
  • F Staley
  • PW Stankus
  • M Stepanov
  • A Ster
  • SP Stoll
  • T Sugitate
  • JP Sullivan
  • S Takagi
  • EM Takagui
  • A Taketani
  • KH Tanaka
  • Y Tanaka
  • K Tanida
  • MJ Tannenbaum
  • A Taranenko
  • P Tarjan
  • TL Thomas
  • M Togawa
  • J Tojo
  • H Torii
  • RS Towell
  • VN Tram
  • I Tserruya
  • Y Tsuchimoto
  • Henrik Tydesjö
  • N Tyurin
  • TJ Uam
  • HW van Hecke
  • J Velkovska
  • M Velkovsky
  • V Veszpremi
  • AA Vinogradov
  • MA Volkov
  • E Vznuzdaev
  • XR Wang
  • Y Watanabe
  • SN White
  • N Willis
  • FK Wohn
  • CL Woody
  • W Xie
  • A Yanovich
  • S Yokkaichi
  • GR Young
  • IE Yushmanov
  • WA Zajc
  • O Zaudtke
  • C Zhang
  • S Zhou
  • J Zimanyi
  • L Zolin
  • X Zong
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number202002
JournalPhysical Review Letters
Volume93
Issue number20: 202002
Publication statusPublished - 2004
Publication categoryResearch
Peer-reviewedYes