6533b86cfe1ef96bd12c89ea

RESEARCH PRODUCT

Charged-pion cross sections and double-helicity asymmetries in polarizedp+pcollisions ats=200  GeV

D. RoachK. M. KijimaK. HashimotoXingguo LiS. KanetiS. P. SorensenO. ChvalaJ. G. LajoieA. SukhanovK. KuritaH. PereiraY. NakamiyaD. LynchR. PakM. TomášekVladimir SamsonovM. RosatiTamás CsörgőG. S. KyleF. FleuretPrashant ShuklaAlice MignereyJames AlexanderD. HornbackB. MeredithS. F. PateC. L. WoodyMate CsanadJ. NewbyAtsushi TakaharaByung-sik HongB. LoveA. BazilevskyKe. NakamuraK. A. DreesMartin PurschkeC. A. AidalaC. A. AidalaH. A. ToriiL. D'orazioT. W. JonesR. ArmendarizAaron AngeramiYuhei MorinoJiangyong JiaY. TanakaT. Sugitate45A. KissHongfang LiuD. E. FieldsJan RakJan RakY. GotoJ. L. NagleD. JohnP. CasteraR. LaceyD. BroxmeyerD. M. LeeMasamichi IshiharaW. A. ZajcE. MannelHenner BueschingM. NihashiM. MccumberMinghui LiuS. MotschwillerBeomkyu KimR. Granier De CassagnacA. AdareV. BaublisI. V. SourikovaHiromi IinumaD. KleinjanV. PapavassiliouCharles MaguireC. SilvestreA. DenisovYuki WatanabeEric AppeltV. CiancioloX. GongKenneth Francis ReadB. KomkovSenta GreeneTakao SakaguchiT. IchiharaR. K. ChoudhuryR. SetoK. S. JooR. S. HollisR. P. PisaniH. J. MoonN. N. AjitanandA. V. KazantsevL. A. Linden LevyJ. G. RubinA. T. BasyeMarisilvia DonadelliV. BumazhnovNorio SaitoSergey FokinN. ApadulaTsutomu MibeX. HeM. A. L. LeiteA. TaranenkoL. TomášekTakahiro NakamuraAgneta OskarssonTakahiro FusayasuH. H. ShimY. AramakiM. OuchidaA. VossenR. PettiA. D. FrawleyRobert VertesiT. HoraguchiB. FademN. MeansE. O'brienI. J. ChoiI. J. ChoiO. DietzschY. FukaoS. EsumiS. H. LimJ. KosterS. H. LeeY. AkibaJ. S. YooC. MckinneyK. R. AndrewsA. DurumL. PatelR. TanabeKenjiro MikiS. NagamiyaD. SharmaR. IchimiyaM. K. DayanandaD. SilvermyrT. HesterE. KistenevKensuke HommaE. RichardsonC. HarperR. BelmontR. BelmontJ. S. KapustinskyM. Grosse PerdekampH. MasuiM. WysockiB. BannierB. AzmounY. J. MaoV. BabintsevF. GiordanoA. KrálJ. SunT. C. AwesKyoichiro OzawaVaclav VrbaKlaus Johannes ReygersAstrid MorrealeC. GalX. JiangJulia VelkovskaK. S. SimBarbara JacakT. MurakamiE. M. TakaguiRui WeiJ. S. BokA. YanovichK. N. BarishM. E. ConnorsS. K. ParkRushan HanH. PeiS. TarafdarH. A. GustafssonA. DattaB. BassalleckRyugo S. HayanoM. MendozaP. KlineR. YangK. S. LeeS. SanoS. N. WhiteDeepa ThomasY. RiabovN. GrauKenta ShigakiM. KonnoEva HaslumW. HolzmannM. NguyenY. L. YamaguchiM. SlunečkaP. L. McgaugheyO. DrapierMaya Hachiya ShimomuraM. L. BrooksZvi Hirsh CitronA. S. NyaninK. ImaiJ. T. MitchellMotoi InabaJ. C. HillK. NakanoR. M. WrightM. I. NagyM. ProisslRachid NouicerA. N. ZelenskiS. TanejaR. SeidlD. WinterD. Yu PeressounkoY. I. MakdisiViktor RiabovD. WatanabeK. KaratsuVladislav MankoW. E. SondheimD. IvanischevJ. Ben-benjaminS. SawadaY. HoriAnne Marie SicklesH. ThemannK. V. DharmawardaneE. VznuzdaevJ. YingA. FranzK. BoyleS. DairakuC. ValeG. R. YoungM. J. TannenbaumM. ViriusE. T. AtomssaE. TennantA. DionA. DionManabu TogawaJohannes Peter WesselsC. H. ChenA. ManionT. SodreJongmin LeeA. TaketaniMakoto OkaByoungchoo ParkC. OakleyA. DreesJen-chieh PengJ. E. FrantzS. BatheInkyu ParkM. ChiuC. A. OgilvieXiong WangT. K. HemmickBhawani SinghZ. Conesa Del ValleJ. M. DurhamJ. M. DurhamYasuo MiakeDong Jo KimDong Jo KimL. KochendaM. IssahDon McglincheyD. KotovJason KaminS. P. StollS. S.e. RosendahlG. BunceA. VeichtD. JouanI. TserruyaYu. EfremenkoV. SinghL. GuoAlexei KhanzadeevE. StenlundM. SarsourC. BaumannY. J. KwonA. GlennS. HuangJ. B. ChoiT. V. MoukhanovaDmitry BlauE. J. DesmondJ. HanksE. Vazquez-zambranoJ. S. KangM. KasaiY. TsuchimotoY. IwanagaI. E. YushmanovEunja KimAlexander MilovI. NakagawaYoung-ki KimT. EngelmoreC. P. SinghV. S. PantuevB. M. JohnsonJ. HamblenE. R. KinneyD. P. MorrisonS. CampbellB. H. KangK. OkadaH. Al-ta'aniTatsuya ChujoB. SahlmuellerH. En'yoM. J. LeitchA. IordanovaJ. MurataK. WatanabeK. ShojiYongsun KimP. W. StankusH. QuHideki HamagakiK. AokiG. DavidK. I. HahnJ. SziklaiPeter ChristiansenT. KempelBrian ColeR. S. TowellH. Van HeckeI. GarishviliY. IkedaF. WeiM. GoninR. AkimotoC. PinkenburgG. RocheC. Y. ChiM. KurosawaA. LebedevM. SavastioS. YokkaichiD. KawallK. TanidaJ. H. KangY. MiyachiJ. S. HaggertyS. R. LeeK. UtsunomiyaGerd Joachim KundeI. SheinY. S. LaiK. SedgwickA. DeshpandeY. WatanabeI. YounusR. A. SoltzM. NaglisA. EnokizonoC. L. SilvaTaku GunjiS. ButsykS. ZhouS. D. RolnickAjit Kumar MohantyT. A. ShibataT. SatoD. IsenhowerI. RavinovichM. BaiE. C. AschenauerZhiying YouR. BennettM. FingerK. B. Lee

subject

Quantum chromodynamicsPhysicsNuclear and High Energy PhysicsParticle physicsNuclear TheorySpin structureDeep inelastic scatteringHelicityInelastic neutron scatteringNuclear physicsPionHigh Energy Physics::ExperimentNuclear ExperimentNucleonRelativistic Heavy Ion Collider

description

We present midrapidity charged-pion invariant cross sections, the ratio of the pi(-) to pi(+) cross sections and the charge-separated double-spin asymmetries in polarized p + p collisions at root s = p + 200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the charged-pion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. The charge-separated pion asymmetries presented here sample an x range of similar to 0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution.

https://doi.org/10.1103/physrevd.91.032001