Exciting opportunities at JLab GeV!
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- Mervyn Scott
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1 Exciting opportunities at JLab GeV! JLab users town meeting, Newport News! March ! Kawtar Hafidi!
2 Develop a common vision for the future! The future starts today! 40 - Today (2012), we are JLab 6 GeV users! 42 - Tomorrow (2014), we will be JLab 12 GeV users! 58 - After tomorrow (2030), we will be JLab GeV users! JLab EIC RHIC EIC users! users!???? users! Politics apart: We need to come up with the best physics! program with comparable or lower cost facility!
3 Lepton-nucleon/nucleus facilities! JLab 25-75! JLab12 (nucleon) (nucleon)
4 A Possible Phase II : GeV Courtesy of Larry Cardman! Operated by the Southeastern Universities Research Association for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Page 4 Strategic Planning Exercise
5 Courtesy of Larry Cardman! 50 GeV: Five Passes through Three 3.33 GeV Linacs 22 x C150 or 17 x C m long 400 m radius Operated by the Southeastern Universities Research Association for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Page 5 Strategic Planning Exercise
6 High luminosity: Exclusive reactions Pion form factor! Q 2 F π Garth Huber & Dave Gaskell! JLab 50! EIC! The pion is the lightest and simplest QCD system! Study the transition to perturbative QCD regime in confined system!
7 3D Structure of the nucleon! Nucleon Spin Quark Spin Semi-inclusive processes and transverse momentum distributions! Quark / Nucleon Quark polariza4on Un Polarized Longitudinally Polarized Transversely Polarized U f 1 = h 1 = Nucleon Polariza0on L T f 1T = g 1 = g 1T = h 1L = h 1T = h 1T =
8 SIDIS Kinematic coverage:!e p e π + X Harut Avakian! 24 GeV 50 GeV For a given luminosity (30min of runtime with L = cm -2 s -1 ) and a given bin in hadron z and P T, higher energy provides higher counts and wider coverage in x and Q 2!
9 Higher energies leads to better Kinematic coverage:! Counts GeV GeV 50 GeV 0.9<P T <1.1 GeV 0.5<z<0.6 Counts Harut Avakian! 0.09<x<0.11 GeV 0.5<z< GeV 11 GeV x Wider x range allow studies of transverse distributions of sea quarks and gluons! P T 2(GeV 2 ) Wider P T range will be important in extraction of -dependences of PDFs! For a given luminosity and given bin in hadron z and P T, higher energy provides higher counts and wider coverage in x and P T to allow studies of correlations between longitudinal and transverse degrees of freedom!
10 Q 2 evolution of transverse momentum distributions! Counts <x< <P T < <z<0.6 Harut Avakian! GeV 10 2 Aybat,Prokudin&Rogers arxiv: ! Q 2 (GeV 2 ) For the same luminosity and bin in z and p T, higher energy provides higher counts and wider coverage in Q 2 allowing studies of Q 2 evolution of 3D partonic distributions in a wide Q 2 range!
11 Nucleon angular momentum! 24 GeV Ji Sum rule (1997)! Spin of quarks! Contribution:! Measured in DIS! Orbital angular momentum of quarks:! Input from Lattice! and measurements at JLab 12 GeV! Total angular momentum of gluons! Through the momentum sum rule and HERA DVMP with J/Psi data we have a glimpse on GPD H g! Nothing is known about GPD E g!
12 Peter Kroll! JLab Users Mee0ng 2011, Newport News, VA 3/16/12 12
13 A Golden Experimental Program! γ 0.10!""""""#!""""""#!!!! Courtesy of Zein-Eddine Meziani! J/ψ 0.08 AU T (J/Ψ) P. Kroll! t [GeV2] black: δe = 0.0, αe! = 0.25 blue: δe = ln (mc /GeV), αe! = 0.45 magenta: δe = 0.1, αe! = 0.15 AU T (Υ) nearly twice as large s = 55 GeV P Glue imaging using unpolarized targets and accessing gluon GPD H through exclusive meson production in the valence region! Transversely polarized nucleon to access gluon GPD E and the Spin Sum Rule.!!"#"$$% JLab Users Meeting 2011, Newport News, VA! $&% 3/16/12 13
14 A UT (J/ψ)! W = 8 GeV t = -0.7 GeV 2! K.H, Meziani & Mustapha! J. Koempel, P. Kroll, A. Metz & J. Zhou, arxiv: v1! 50 GeV electron beam! cm -2 s -1 luminosity! 90 days running! V1 V2 V3 V4 V Q 2 (GeV 2 )
15 Double spin asymmetry A LS (J/ψ) with longitudinally polarized proton target and polarimetry of the recoil proton! 0.6 W = 8 GeV t = -0.7 GeV 2! K.H, Meziani & Mustapha! A LS (J/ψ) E B = 75 GeV! L = cm -2 s -1! Beam time = 365 days! 0.3 E B = 50 GeV! V1 V2 V3 V4 V J. Koempel, P. Kroll, A. Metz & J. Zhou, arxiv: v1! Q 2 (GeV 2 )
16 Process fractions for charm production Photon-gluon fusion! 82% Resolved photons processes 0% 5% 10%
17 x vs Q 50 GeV electron beam! D 0 K - π + (3.8%) D *+ D 0 π + (68%)
18 Momentum and angular distribution of π + and K - from open charm! π + K π + K
19 ΔG/G Projections for open charm production A. El Alaoui & KH! JLab 50 GeV! 200 days running!
20 Summary & outlook! JLab GeV seems like a natural extension of JLab 12 although for the physics I am interested in, JLab 50 is even a better option than 11 GeV! It looks promising! Do we want and are we allowed to investigate further the JLab option?! What is the lab management position?! How about the nuclear physics community at large?!
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