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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"
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
(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
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.