Structure of the Proton CTEQ Parton Distribution Functions CTEQ6.6 P. M. Nadolsky, H.-L. Lai, Q.-H. Cao, J. Huston, J. Pumplin, D. Stump, W.-K. Tung, C.-P.

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Structure of the Proton CTEQ Parton Distribution Functions CTEQ6.6 P. M. Nadolsky, H.-L. Lai, Q.-H. Cao, J. Huston, J. Pumplin, D. Stump, W.-K. Tung, C.-P. Yuan, Implications of CTEQ global analysis for collider observables, Phys.Rev.D78:013004,2008 arXiv: v3 [hep-ph] CT10 Hung-Liang Lai, Marco Guzzi, Joey Huston, Zhao Li, Pavel M. Nadolsky, Jon Pumplin, C.-P. Yuan, New parton distributions for collider physics, Phys.Rev.D82:074024,2010 arXiv: v3 [hep-ph] The results shown below are for CT10. B31cteqss 11

Structure of the Proton U Quark (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) Red: u(x,Q 2 ) Dashed Red: ū(x,Q 2 ) Gray: u valence (x,Q 2 ) This log-log plot shows … … for x ≳ 0.1 the valence structure dominates … for x ≲ 0.01 ū approaches u B32cteqss 11 CT10 PDFs

Structure of the Proton U Quark (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) Red: x u(x,Q 2 ) Dashed Red: x ū(x,Q 2 ) Gray: x u valence (x,Q 2 ) This linear plot shows the momentum fraction for Q = 3.16 GeV (= area under the curve) integral ≈ 0.32, 0.05, 0.27 CT10 PDFs B33cteqss 11

Structure of the Proton U Quark (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) Red: u valence (x,Q 2 ) This linear plot demonstrates the flavor sum rule: integral = 2 CT10 PDFs B34cteqss 11

Structure of the Proton D Quark (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) Blue: d(x,Q 2 ) Dashed Blue: đ(x,Q 2 ) Gray: d valence (x,Q 2 ) This log-log plot shows … … for x ≳ 0.1 the valence structure dominates … for x ≲ 0.01 đ approaches d CT10 PDFs B35cteqss 11

Structure of the Proton D Quark (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) Blue: d(x,Q 2 ) Dashed Blue: đ(x,Q 2 ) Gray: d valence (x,Q 2 ) This linear plot shows the momentum fraction for Q = 3.16 GeV (= area under the curve) integral ≈ 0.15, 0.06, 0.10 CT10 PDFs B36cteqss 11

Structure of the Proton D Quark (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) d valence = d – đ (x,Q 2 ) This linear plot demonstrates the flavor sum rule: integral = 1 CT10 PDFs B37cteqss 11

This linear plot compares U and D -- quarks and antiquarks; naively, d = 0.5 u, but it’s not that simple. Structure of the Proton D Quark (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) Blue: d(x,Q 2 ) Dashed Blue: đ(x,Q 2 ) Gray: d valence (x,Q 2 ) Red: u(x,Q 2 ) Dashed Red: ū(x,Q 2 ) Gray: u valence (x,Q 2 ) CT10 PDFs B38cteqss 11

Structure of the Proton D Quark (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) d(x,Q 2 ) / u(x,Q 2 ) v x CT10 PDFs B39cteqss 11 d(x,Q 2 ) / u(x,Q 2 ) is interesting. Exercise: What scattering processes could provide information on this ratio?

Structure of the Proton Gluon (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) black : g(x,Q 2 ) red : u(x,Q 2 ) The gluon dominates at small x. The valence quarks dominate at large x. CT10 PDFs B310cteqss 11

Structure of the Proton Gluon (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) black : g(x,Q 2 ) purple : 2(ū + đ ) (x,Q 2 ) Comparing the gluon PDF and the sea quark PDFs. CT10 PDFs B311cteqss 11

Structure of the Proton Sea Quarks and Gluon (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) sea(x,Q 2 ) / g(x,Q 2 ) v x blue: ū/g red: đ/g purple: the sum For small x, ū/g = đ/g = constant Exercise: Why? CT10 PDFs B312cteqss 11

Structure of the Proton (Q 2 = 10 GeV 2 ; Q = 3.16 GeV) All in One Plot u_valence d valence sea * 0.05 gluon * 0.05 CT10 PDFs B313cteqss 11

B3cteqss 1114 Exercise: (A) Use the Durham Parton Distribution Generator (online PDF calculator) to reproduce these graphs. (B) Show the Q 2 evolution.