Sean Fleming
University of Arizona

Thomas Mehen
Duke University

Anna Stasto
Pennsylvania State University

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Inge Dolan
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INT Program INT-11-3

Frontiers in QCD

September 19 - November 18, 2011

Week 4 Schedule - All talks in seminar room C421

Monday, October 10

11 am: Ian Balitsky, "High-energy amplitudes in the next-to-leading order in N=4 SYM"
    Abstract: The high-energy behavior of gauge theory amplitudes can be studied using the operator expansion in Wilson lines. I discuss the next-to-leading order calculations of the high-energy amplitudes in N=4 SYM.

Tuesday, October 11

11 am: Giovanni Chirilli, "High-energy Amplitudes and Impact Factors at next-to-leading-order"

    Abstract: To study scattering amplitudes at high-energies, the T-product of two currents can be expanded in terms of coefficient functions (impact factors) and matrix elements of "composite color dipoles" made of Wilson line with rapidity-cutoff that preserves conformal invariance. In the leading order, the high-energy evolution of color dipoles is governed by the non-linear Balitsky-Kovchegov (BK) equation. To describe the high-energy amplitudes in the next-to-leading order (NLO) one needs to know the coefficient function ("impact factor") and the evolution of the corresponding Wilson-line operators at NLO. Using the high-energy OPE, we find the next-to-leading order (NLO) correction to the BK equation and calculate the impact factor for virtual photons in deep inelastic scattering. We present the Mellin representation of the photon impact factor at NLO for polarized and unpolarized DIS structure functions and the Fourier transform in momentum space for the forward case.

Wednesday, October 12

11 am: Jamal Jalilian-Marian, "Two-particle correlations at high energy"

    Abstract: Multi-gluon correlators appear in calculations of di-hadron rapidity and angular correlations at high energy in the Color Glass Condensate formalism. Evolution equations for these higher-point functions have recently been derived and shown to reduce to known equations (BFKL, BJKP) in appropriate limits and numerical solutions have been obtained. We discuss the importance of these higher-point correlators and also point out that initial conditions play a significant role in di-hadron rapidity correlations.

Thursday, October 13

11 am: Lech Szymanowski, "The time like Compton scattering at high and medium energies"

    Abstract: I'll emphasize the complementarity of timelike and spacelike studies of deep exclusive processes, taking as an example the case of timelike Compton Scattering (TCS) i.e. the exclusive photoproduction of a lepton pair with large invariant mass, vs deeply virtual Compton scattering (DVCS) i.e. the exclusive leptoproduction of a real photon. Both amplitudes factorize with the same generalized parton distributions (GPDs) as their soft parts and coefficient functions which differ significantly at next-to-leading order in alpha_s. The data on TCS at very high energy should be available soon thanks to the study of ultraperipheral collisions at the LHC and RHIC opening a window on quark and gluon GPDs at very small skewness. The TCS will be also a hot subject of experiments at medium energies planned at Hall D of Jlab.

Friday, October 14

11 am: Amir Rezaeian, "Inclusive hadron production at the LHC from the Color Glass Condensate"

    Abstract: I will discuss the rapidity and energy dependencies of inclusive hadron productions in pp, pA and AA collisions at the LHC based on the idea of gluon saturation in the color-glass condensate framework. On this line, I will talk about hadron multiplicity, ridge and R_pA. In particular, I will discuss if there has been any unique indication of gluon saturation in the LHC first year data.