First Observation of the Directed Flow of D-0 and <(D-0)over bar> in Au +Au Collisions at root s(NN)=200 GeV
Genre
Pre-printDate
2019-10-16Author
Adam, JAdamczyk, L
Adams, JR
Adkins, JK
Agakishiev, G
Aggarwal, MM
Ahammed, Z
Alekseev, I
Anderson, DM
Aoyama, RAparin, AAschenauer, ECAshraf, MUAtetalla, FGAttri, AAverichev, GSBairathi, VBarish, KBassill, AJBehera, ABellwied, RBhasin, ABhati, AKBielcik, JBielcikova, JBland, LCBordyuzhin, IGBrandenburg, JDBrandin, AVBryslawskyj, JBunzarov, IButterworth, JCaines, HSanchez, M Caldern de la BarcaCebra, DChakaberia, IChaloupka, PChan, BKChang, F-HChang, ZChankova-Bunzarova, NChatterjee, AChattopadhyay, SChen, JHChen, XCheng, JCherney, MChristie, WContin, GCrawford, HJCsanad, MDas, SDedovich, TGDeppner, IMDerevschikov, AADidenko, LDilks, CDong, XDrachenberg, JLDunlop, JCEdmonds, TElsey, NEngelage, JEppley, GEsha, REsumi, SEvdokimov, OEwigleben, JEyser, OFatemi, RFazio, SFederic, PFedorisin, JFeng, YFilip, PFinch, EFisyak, YFulek, LGagliardi, CAGalatyuk, TGeurts, FGibson, AGopal, KGreiner, LGrosnick, DGupta, AGuryn, WHamad, AIHamed, AHarris, JWHe, LHeppelmann, SHerrmann, NHolub, LHong, YHorvat, SHuang, BHuang, HZHuang, SLHuang, THuang, XHumanic, TJHuo, PIgo, GJacobs, WWJena, CJentsch, AJi, YJia, JJiang, KJowzaee, SJu, XJudd, EGKabana, SKagamaster, SKalinkin, DKang, KKapukchyan, DKauder, KKe, HWKeane, DKechechyan, AKelsey, MKhyzhniak, YVKikola, DPKim, CKinghorn, TAKisel, IKisiel, AKocan, MKochenda, LKosarzewski, LKKramarik, LKravtsov, PKrueger, KMudiyanselage, N KulathungaKumar, LElayavalli, R KunnawalkamKwasizur, JHLacey, RLandgraf, JMLauret, JLebedev, ALednicky, RLee, JHLi, CLi, WLi, XLi, YLiang, YLicenik, RLin, TLipiec, ALisa, MALiu, FLiu, HLiu, PLiu, TLiu, XLiu, YLiu, ZLjubicic, TLlope, WJLomnitz, MLongacre, RSLuo, SLuo, XMa, GLMa, LMa, RMa, YGMagdy, NMajka, RMallick, DMargetis, SMarkert, CMatis, HSMatonoha, OMazer, JAMeehan, KMei, JCMinaev, NGMioduszewski, SMishra, DMohanty, BMondal, MMMooney, IMoravcova, ZMorozov, DANasim, MdNayak, KNelson, JMNemes, DBNie, MNigmatkulov, GNiida, TNogach, LVNonaka, TOdyniec, GOgawa, AOh, SOkorokov, VAPage, BSPak, RPanebratsev, YPawlik, BPawlowska, DPei, HPerkins, CPinter, RLPluta, JPorter, JPosik, MPruthi, NKPrzybycien, MPutschke, JQuintero, ARadhakrishnan, SKRamachandran, SRay, RLReed, RRitter, HGRoberts, JBRogachevskiy, OVRomero, JLRuan, LRusnak, JRusnakova, OSahoo, NRSahu, PKSalur, SSandweiss, JSchambach, JSchmidke, WBSchmitz, NSchweid, BRSeck, FSeger, JSergeeva, MSeto, RSeyboth, PShah, NShahaliev, EShanmuganathan, PVShao, MShen, FShen, WQShi, SSShou, QYSichtermann, EPSiejka, SSikora, RSimko, MSingh, JSingha, SSmirnov, DSmirnov, NSolyst, WSorensen, PSpinka, HMSrivastava, BStanislaus, TDSStefaniak, MStewart, DJStrikhanov, MStringfellow, BSuaide, AAPSugiura, TSumbera, MSumma, BSun, XMSun, YSurrow, BSvirida, DNSzelezniak, MASzymanski, PTang, AHTang, ZTaranenko, ATarnowsky, TTawfik, AThomas, JHTimmins, ARTlusty, DTokarev, MTomkiel, CATrentalange, STribble, RETribedy, PTripathy, SKTsai, ODTu, BTu, ZUllrich, TUnderwood, DGUpsal, IVan Buren, GVanek, JVasiliev, ANVassiliev, IVidebaek, FVokal, SVoloshin, SAWang, FWang, GWang, PWang, YWebb, JCWen, LWestfall, GDWieman, HWissink, SWWitt, RWu, YXiao, ZGXie, GXie, WXu, HXu, NXu, QHXu, YFXu, ZYang, CYang, QYang, SYang, YYang, ZYe, ZYe, ZYi, LYip, KZbroszczyk, HZha, WZhang, DZhang, LZhang, SZhang, XPZhang, YZhang, ZZhao, JZhong, CZhou, CZhu, XZhu, ZZurek, MZyzak, MCollaboration, STAR
Subject
STAR CollaborationPermanent link to this record
http://hdl.handle.net/20.500.12613/4533Metadata
Show full item recordDOI
10.1103/PhysRevLett.123.162301Abstract
We report the first measurement of rapidity-odd directed flow (v_{1}) for D^{0} and D^{0}[over ¯] mesons at midrapidity (|y|<0.8) in Au+Au collisions at sqrt[s_{NN}]=200 GeV using the STAR detector at the Relativistic Heavy Ion Collider. In 10-80% Au+Au collisions, the slope of the v_{1} rapidity dependence (dv_{1}/dy), averaged over D^{0} and D^{0}[over ¯] mesons, is -0.080±0.017(stat)±0.016(syst) for transverse momentum p_{T} above 1.5 GeV/c. The absolute value of D^{0} meson dv_{1}/dy is about 25 times larger than that for charged kaons, with 3.4σ significance. These data give a unique insight into the initial tilt of the produced matter, and offer constraints on the geometric and transport parameters of the hot QCD medium created in relativistic heavy-ion collisions.Has part
PHYSICAL REVIEW LETTERSADA compliance
For Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.eduScopus Count
Collections
Related items
Showing items related by title, author, creator and subject.
-
Cosmogenic neutron production at Daya BayNeutrons produced by cosmic ray muons are an important background for underground experiments studying neutrino oscillations, neutrinoless double beta decay, dark matter, and other rare-event signals. A measurement of the neutron yield in the three different experimental halls of the Daya Bay Reactor Neutrino Experiment at varying depth is reported. The neutron yield in Daya Bay's liquid scintillator is measured to be $Y_n=(10.26\pm 0.86)\times 10^{-5}$, $(10.22\pm 0.87)\times 10^{-5}$, and $(17.03\pm 1.22)\times 10^{-5}~\mu^{-1}~$g$^{-1}~$cm$^2$ at depths of 250, 265, and 860 meters-water-equivalent. These results are compared to other measurements and the simulated neutron yield in Fluka and Geant4. A global fit including the Daya Bay measurements yields a power law coefficient of $0.77 \pm 0.03$ for the dependence of the neutron yield on muon energy.
-
Improved measurement of the longitudinal spin transfer to Λ and Λ¯ hyperons in polarized proton-proton collisions at s=200 GeVThe longitudinal spin transfer $D_{LL}$ to $\Lambda$ and $\bar{\Lambda}$ hyperons produced in high-energy polarized proton--proton collisions is expected to be sensitive to the helicity distribution functions of strange quarks and anti-quarks of the proton, and to longitudinally polarized fragmentation functions. We report an improved measurement of $D_{LL}$ from data obtained at a center-of-mass energy of $\sqrt{s}$ = 200 GeV with the STAR detector at RHIC. The data have an approximately twelve times larger figure-of-merit than prior results and cover $|\eta|<$ 1.2 in pseudo-rapidity with transverse momenta $p_T$ up to 6 GeV/c. In the forward scattering hemisphere at largest $p_T$, the longitudinal spin transfer is found to be $D_{LL}$ = -0.036 $\pm$ 0.048 (stat) $\pm$ 0.013(sys) for $\Lambda$ hyperons and $D_{LL}$ = 0.032 $\pm$ 0.043\,(stat) $\pm$ 0.013\,(sys) for $\bar{\Lambda}$ anti-hyperons. The dependences on $\eta$ and $p_T$ are presented and compared with model evaluations.
-
Longitudinal double-spin asymmetries for pi(0)s in the forward direction for 510 GeV polarized pp collisionsThe STAR Collaboration reports measurements of the longitudinal double-spin asymmetry, $A_{LL}$, for neutral pions produced at forward directions in polarized proton-proton collisions, at a center-of-mass energy of $510$ GeV. Results are given for transverse momenta in the range $2<p_{T}<10$ GeV/$c$ within two regions of pseudorapidity that span $2.65<\eta<3.9$. These results are sensitive to the polarized gluon parton distribution function, $\Delta g(x)$, down to the region of Bjorken $x \sim 10^{-3}$. The asymmetries observed are less than $\pm 5 \cdot 10^{-3}$ in magnitude, and will help constrain the contribution to the spin of the proton from polarized gluons at low $x$, when combined with other measurements as part of a global analysis.
