Angular Distribution in Unpolarized Proton-induced Drell-Yan Process

Slides:

Advertisements

Similar presentations

1 Transversity Physics Update Jen-Chieh Peng Polarized 3 He and Tansversity Collaboration Meeting, JLab, October 21-22, 2005 University of Illinois at.

Advertisements

Transversity and Transverse-Momentum-Dependent Partonic Functions Alessandro Bacchetta.

1 Partonic Substructure of Nucleons and Nuclei with Dimuon Production Partonic structures of the nucleons and nuclei with dimuon production –Overview and.

Simulations of Single-Spin Asymmetries from EIC Xin Qian Kellogg, Caltech EIC Meeting at CUA, July 29-31, TMD in SIDIS 2.Simulation of SIDIS.

1 Updates on Transversity Experiments and Interpretations Jen-Chieh Peng Transversity Collaboration Meeting, JLab, March 4, 2005 University of Illinois.

9/19/20151 Semi-inclusive DIS: factorization Feng Yuan Lawrence Berkeley National Laboratory RBRC, Brookhaven National Laboratory.

Drell-Yan Perspectives at FAIR Marco Destefanis Università degli Studi di Torino Drell-Yan Scattering and the Structure of Hadrons Trento (Italy) May 21-25,

1 Flavor Symmetry of Parton Distributions and Fragmentation Functions Jen-Chieh Peng Workshop on “Future Prospects in QCD at High Energy” BNL, July 17-22,

Spin Azimuthal Asymmetries in Semi-Inclusive DIS at JLAB  Nucleon spin & transverse momentum of partons  Transverse-momentum dependent distributions.

1 Probing the Nucleon Structure with Azimuthal Asymmetries --cos2φ distribution & Boer-Mulders F. Lingyan Zhu University of Illinois at Urbana-Champaign.

Jim Stewart DESY Measurement of Quark Polarizations in Transversely and Longitudinally Polarized Nucleons at HERMES for the Hermes collaboration Introduction.

Transverse Spin Physics: Recent Developments

Single-Spin Asymmetries at CLAS  Transverse momentum of quarks and spin-azimuthal asymmetries  Target single-spin asymmetries  Beam single-spin asymmetries.

1 Possible Additional Measurements in E906 Azimuthal angular distributions of Drell-Yan and J/ Ψ p+d/p+p ratios for J/ Ψ production Nuclear effects of.

1 Probing Spin and Flavor Structures of the Nucleon with Hadron Beams Flavor and spin structures of the nucleons –Overview and recent results Future prospects.

I R F U DRELL-YAN at COMPASS Stephane Platchkov I nstitut de R echerche sur les lois F ondamentales de l’ U nivers CEA/IRFU, Saclay, France GDR Nucléon.

Physics to be explored by the un-polarized Drell-Yan program in COMPASS experiment Wen-Chen Chang Institute of Physics, Academia Sinica, Taiwan on behalf.

JPARC DY Workshop, April 7 Ralf Seidl (RBRC) R.Seidl: Transverse Spin 1RIKEN, April 7 In JPARC Drell Yan accessible with: UU(unpolarized beam, unpolarized.

1 Azimuthal dependence in unpolarized proton-induced Drell-Yan processes Mini-symposium on orbital motion of quarks in hard scattering 2 nd joint meeting.

Drell-Yan pairs from pion scattering on longitudinally polarized nucleons COMPASS DY meeting, Torino, March Oleg Teryaev BLTP, JINR, Dubna.

1 Harut Avakian Studies on transverse spin effects at Jlab QCD Structure of the Nucleon June 12-16, 2006, Rome Physics motivation k T -effects from unpolarized.

For SoLID Collaboration Meeting Spokespersons Jian-Ping Chen (JLab) Jin Huang (MIT) Yi Qiang (JLab) Wenbiao Yan (USTC, China)

2/10/20161 What can we learn with Drell-Yan in p(d)-nucleus collisions Feng Yuan Lawrence Berkeley National Laboratory RBRC, Brookhaven National Laboratory.

Feb 13,2007Brookhaven National Lab1 Cos2φ Asymmetry in p+d/p+p Drell-Yan Lingyan Zhu University of Illinois at Urbana-Champaign FNAL E866/Nusea Collaboration.

1 Quarkonium Production at J-PARC Quarkonium Production at J-PARC with Unpolarized Proton Beam Quarkonium Production at J-PARC with Polarized Beam and.

High-energy hadron physics at J-PARC Wen-Chen Chang 章文箴 Institute of Physics, Academia Sinica, Taiwan KEK theory center workshop on Hadron physics with.

1 Beijing, July 2, 2008 Aram Kotzinian SIDIS asymmetries in Quark-Diquark model for Distribution Functions Aram Kotzinian CEA-Saclay, IRFU/Service de Physique.

1 Transversity Experiments Experimental probes for transversity Current experimental status on transversity and other related distribution and fragmentation.

Progress and opportunities of unpolarised Drell-Yan program Wen-Chen Chang Institute of Physics, Academia Sinica, Taiwan COMPASS beyond 2020 Workshop.

Transversity (transverse spin and transverse motion)

Flavor decomposition at LO

Single-Transverse Spin Asymmetries in Hadronic Scattering

! how important for transverse spin studies

Qin-Tao Song High Energy Accelerator Research Organization (KEK)

TMD experiments from COMPASS SIDIS

Our Understanding of Sea Quarks in the Nucleon

Measurements of quark transversity and orbital motion in hard scattering Yoshiyuki Miyachi Tokyo Institute of Technology.

Luciano Pappalardo for the collaboration

3/19/20181 Nucleon Spin: Final Solution at the EIC Feng Yuan Lawrence Berkeley National Laboratory.

Experimental Study of Transversity

Prague 2007 Collins and Sivers asymmetries

Physics with polarized antiprotons at GSI-PAX

Transverse parton distribution functions

Strangeness and Spin in Fundamental Physics

Semi-inclusive DIS at Small-x

Christine A. Aidala University of Michigan

Semi-inclusive DIS at 12 GeV

Can We Learn Quark Orbital Motion from SSAs?

Unique Description for SSAs in DIS and Hadronic Collisions

past and future experiments

Large-X PDFs in the Drell-Yan Process

past and future experiments

PHENIX Transverse-Spin Physics

The transverse spin structure of the nucleon

Quark and Gluon Sivers Functions

Searching for intrinsic motion effects in SIDIS

University of Erlangen-Nürnberg & DESY

RESULTS FOR TRANSVERSE SPIN PHYSICS AT COMPASS

Unique Description for Single Transverse Spin Asymmetries

Transversity in D_Y 4/5/2019 Transversity, Transversity-odd Distributions and Asymmetries in Drell-Yan Processes Gary R. Goldstein Tufts University Leonard.

Spin effects and partonic intrinsic k┴

Transversity in D_Y 4/17/2019 Transversity Distributions and T-odd Asymmetries in Drell-Yan Processes Gary R. Goldstein Tufts University Leonard P. Gamberg.

Universality of single spin asymmetries in hard processes

Spin Studies via Drell-Yan Process at PANDA

Single spin asymmetries in semi-inclusive DIS

Unpolarised Drell-Yan physics at COMPASS-II

Probing Fragmentation Func. With SIDIS

Azimuthal dependence in unpolarized proton-induced Drell-Yan processes

New results on SIDIS SSA from JLab

Spin Structure of the Nucleon

Presentation transcript:

Angular Distribution in Unpolarized Proton-induced Drell-Yan Process Lingyan Zhu Jen-Chieh Peng University of Illinois at Urbana-Champaign Paul Reimer Argonne National Laboratory FNAL E866/Nusea Collaboration Apr 12, 2008 APS Meeting at St. Louis, MO

Proton-induced Drell-Yan Process Towell et al., Phys.Rev. D64 (2001) 052002 Apr 12, 2008 APS meeting at St. Louis, MO

Angular Distribution in the Drell-Yan Process In the simple parton model: ( for massless quarks and  measured relative to the annihilation axis) =1 and ==0 Apr 12, 2008 APS meeting at St. Louis, MO

APS meeting at St. Louis, MO QCD Corrections The cross section is increased by a factor of ~2. The Lam-Tung relation holds in any reference frame. Lam & Tung, PRD21,2712(1980) The NLO correction at O(s2) to the angular distribution is small. Mirkes & Ohnemus, PRD51,,4891(1995) The Lam-Tung relation not affected by QCD resummation effects at small QT. Small corrections to lambda and nu in the Collins-Soper frame. Boer&Wogelsang, PRD74,014006(2006) Lam-Tung relation: a unique opportunity to test QCD-improved quark model. Apr 12, 2008 APS meeting at St. Louis, MO

Violation of the Lam-Tung Relation E615 at Fermilab: 252 GeV π- + W Conway et al., PRD39,92(1989) Brandenburg, Brodsky, Khoze & Muller, PRL73,939(1994) Apr 12, 2008 APS meeting at St. Louis, MO

cos2φ Distribution in the W Drell-Yan Conway et al., PRD39,92(1989) E615 at Fermilab: 252 GeV π- + W NA10 at CERN: 140/194/286 GeV π- + W Z. Phys. C37, 545 (1988) Apr 12, 2008 APS meeting at St. Louis, MO

Nuclear Effect? NA10 Z. Phys. C37, 545 (1988) Open: Deuterium Solid: Tungsten Nuclear effect seems not to be the dominant contribution. Apr 12, 2008 APS meeting at St. Louis, MO

APS meeting at St. Louis, MO QCD Vacuum Effect The factorization-breaking spin correlation due to nontrivial QCD vacuum may fit the NA10 data at 194 GeV Brandenburg, Nachtmann & Mirkes, Z. Phy. C60,697(1993) The helicity flip in the instanton-induced contribution may lead to nontrivial vacuum and violation of the Lam-Tung relation. Boer,Brandenburg,Nachtmann&Utermann, EPC40,55(2005). Brandenburg,Ringwald&Utermann, NPB754,107(2006). This vacuum effect should be flavor blind. 0=0.17 mT=1.5 Apr 12, 2008 APS meeting at St. Louis, MO

Leading-Twist Parton Distribution Functions Survive kT integration kT - dependent, T-even kT - dependent, T-odd Apr 12, 2008 APS meeting at St. Louis, MO

Boer-Mulders Function h1┴ An spin-correlation approach in terms of h1┴ can fit the NA10 data at 194 GeV. Boer, PRD60,014012(1999) There are different models to calculate the Boer-Mulders function in proton and pion. Boer,Brodsky&Hwang, PRD67,054003(2003); Gamberg&Goldstein, PLB650,362(2007); Lu&Ma, PRD70,094044(2004); PLB615,200(2005) 1=0.5 mC=2.3 T=CH=1 Apr 12, 2008 APS meeting at St. Louis, MO

Full Angular Distribution in p+d Drell-Yan L.Y. Zhu,J.C. Peng, P. Reimer et al., PRL99,082301(2007). No significant azimuthal asymmetry in p+d Drell-Yan. Apr 12, 2008 APS meeting at St. Louis, MO

Azimuthal cos2Φ Distribution in p+d Drell-Yan L.Y. Zhu,J.C. Peng, P. Reimer et al., PRL99,082301(2007). With Boer-Mulders function h1┴: ν(π-Wµ+µ-X)~ valence h1┴(π) * valence h1┴(p) ν(pdµ+µ-X)~ valence h1┴(p) * sea h1┴(p) Apr 12, 2008 APS meeting at St. Louis, MO

Angular Distribution in E866 p+p/p+d Drell-Yan Preliminary Preliminary Preliminary Preliminary PT (GeV/c) p+p and p+d Drell-Yan show similar angular distribution. Apr 12, 2008 APS meeting at St. Louis, MO

APS meeting at St. Louis, MO Summary Large cos2 azimuthal asymmetry has been observed in unpolarized -induced Drell-Yan. The Lam-Tung relation is violated. The are a few possible explanations including the non-trivial vacuum effect and the non-zero TMD Boer-Mulders function . The unpolarized p-induced Drell-Yan data show only percent-level cos2φ azimuthal asymmetry. This may disfavor the flavor blind explanation such as vacuum effect. More data on unpolarized Drell-Yan will be available from the future experiment E906 at FNAL with proton beam, and GSI with anti-proton beam, as well as some SIDIS data from JLab and HERMES. Apr 12, 2008 APS meeting at St. Louis, MO

APS meeting at St. Louis, MO Apr 12, 2008 APS meeting at St. Louis, MO