SlideServe
Télécharger Obtenir Pro
Menu
Accueil Pro
Préférences
ApparenceLight Aide et commentaires
© SlideServe · v2026

GPDs: Theoretical Richness and Experimental Challenges in High-Energy Physics

jeff avatar
jeff
15 diapositives · 267 Views · Aug 16, 2014

Gain insights into Generalized Parton Distributions (GPDs), a powerful theoretical tool with complex experimental accessibility. Explore latest results from JLab and HERMES experiments, showcasing analysis techniques and ultimate facilities for GPD studies.

GPDs: Theoretical Richness and Experimental Challenges in High-Energy Physics - slide 1
01 / 15GPDs: Theoretical Richness and Experimental Challenges in High-Energy Physics
1 / 17

Télécharger la présentation

GPDs: Theoretical Richness and Experimental Challenges in High-Energy Physics
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation

  1. GPDs @ JLab12 & EIC QCD workshop, 15/12/06

  2. 1/ GPDs are a beautiful/rich theoretical tool but are very difficult to access/extract experimentally 2/ Very encouraging first experimental results coming out from JLab 6 GeV (and HERMES) where we develop/test the analysis techniques 3/ JLab@12 GeV and EIC are the ultimate facilities for a full study/definite extraction of GPDs

  3. t g* x~xB g,M,... x ~ ~ H,E,H,E p p’ Beam or target spin asymmetries contain only ImT, i.e. GPDs at x = x and -x Cross sections and charge asymmetries measurements (ReT) Integral of GPDs over x

  4. Ds 2s ep epg s+ - s- s+ + s- A = = Polarized beam, unpolarized target: ~ ~ x = xB/(2-xB) DsLU~ sinf{F1H+ x(F1+F2)H+kF2E}df H(x,x,t),H(x,x,t), E(x,x,t) k = -t/4M2 (BSA) Kinematical suppression Unpolarized beam, long. pol. target: ~ ~ H, H DsUL~ sinf{F1H+x(F1+F2)(H+ … }df (l)TSA Unpolarized beam, trans. pol. target: H, E DsUT~ sinf{k(F2H – F1E) + …..}df (t)TSA Global (polarized and unpolarized) data analysis, X-sec, asym., (p,n), (g,M), to extract the GPDs

  5. 1/ GPDs are a beautiful/rich theoretical tool but are very difficult to access/extract experimentally 2/ Very encouraging first experimental results coming out from JLab 6 GeV (and HERMES) where we develop/test the analysis techniques 3/ JLab@12 GeV and EIC are the ultimate facilities for a full study/definite extraction

  6. ep epg Hall A 6 GeV DVCS Bethe-Heitler GPDs Difference of polarized cross sections Unpolarized cross sections Thesis C. Muñoz-Camacho (Saclay), A. Camsonne (Clermont) : arXiv:nucl-ex/0607029

  7. Twist-2terms dominate the cross section and are independent ofQ2in the explored kinematical domain • The contribution to the cross section oftwist-3terms issmalland isindependent of Q2in the limit of error bars Strong indication in favor of factorization already from Q2=2 GeV2 in the valence region

  8. DVCS + BH cross sections and comparison to theoritical BH Thesis H.S. Jo (Orsay) Hall B 6 GeV 0.2<-t<0.4 0.4<-t<0.6 0.09<-t<0.2 PRELIMINARY 0.6<-t<1 1<-t<1.5 1.5<-t<2

  9. en eng Thesis M. Mazouz (Grenoble) E03-106 n-DVCS P.Y. Bertin, C.E. Hyde-Wright, F. Sabatié, E. Voutier et al. Strong sensitivity to E PRELIMINARY

  10. 1/ GPDs are a beautiful/rich theoretical tool but are very difficult to access/extract experimentally 2/ Very encouraging first experimental results coming out from JLab 6 GeV (and HERMES) where we develop/test the analysis techniques 3/ JLab@12 GeV and EIC are the ultimate facilities for a full study/definite extraction

  11. EIC : gluons and sea quarks region JLab 12 GeV : valence quarks region Large phase space (x,t,Q2) High luminosity Valence region JLab12 EIC Sea/gluon region

  12. Beam asymmetry@12 GeV IC in standard position – 80 days – 10^35 Lum – VGG model

  13. A LU Sensitivity to GPD models BSA <xB> =0.2 <Q2> = 3.3 GeV2 <-t> = 0.45 GeV2 <xB> =0.2 <Q2> = 3.3 GeV2 <Q2> =3.3 GeV2 <-t> = 0.45 GeV2 TSA <xB> =0.36 <Q2> = 4.1 GeV2 <-t> = 0.52 GeV2 <xB> =0.36 <Q2> = 4.1 GeV2 <Q2> =4.1 GeV2 <-t> = 0.52 GeV2

  14. Q2=5 GeV2 Exclusive r0 prod. with transversely polarized target 2D (Im(AB*))/p T A~ (2Hu +Hd) AUT = - r0 |A|2(1-x2) - |B|2(x2+t/4m2) - Re(AB*)2x2 B~ (2Eu + Ed) Asymmetry depends linearly on the GPD E, which enters Ji’s sum rule. r0 Goeke, Polyakov, Vdh, (2001) L=1035cm-2s-1 2000hrs

  15. GPDs depend on3 variables (x,x,t) and only 2 are experimentally accessible (x,t): convolution issue and inevitable model dependence Need to measure over a large phase space several channels and observables which mutually constrain the GPDs parametrizations Very encouraging first experimental results coming out from JLab 6 GeV (twist-2 dominance, first constraints on GPD models, first –very preliminary- extractions of Ju, Jd,…) Ultimate facilities : JLab@12 GeV (valence quark region) and EIC (gluons and sea quarks region) Summary