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INT Program INT-11-3|
Frontiers in QCD
September 19 - November 18, 2011
Week 1 Schedule - All talks from 11 am - 12 noon in seminar room C421
Title: Surprises and Anomalies in Heavy Quarkonium Production
Production of heavy quarkonia is arguably one of the most fascinating subjects in strong interaction physics. It offers unique perspectives into the formation of QCD bound states. However, since the discovery of J/psi over 35-year ago, theorists still have not been able to fully understand its production mechanism. I will review some of the recent surprises and anomalies in heavy quarkonium production, and offer some thoughts and challenges on the issues.
Title: Medium Induced Collinear Radiation via Soft Collinear Effective Theory (SCET)
Abstract: The propagation of hard partons through the strongly interacting matter created in high energy heavy-ion collisions involves widely separated scales. The methods of Effective Field Theories (EFT) can provide a factorized description at lowest nontrivial order, and a formalism where the correction to this factorization are calculable systematically order by order in the small ratios between the different scales. In this talk I will present our preliminary results on the medium induced collinear radiation by using the methods of Soft Collinear Effective Theory (SCET). The radiated gluon is collinear with the incoming hard parton and gets and arbitrary fraction of its energy.
Title: T-violation in nuclear systems. An effective approach
Abstract: We discuss violation of time-reversal (T) symmetry in nuclear system, in the framework of Chiral Perturbation Theory and nuclear EFTs. We consider the lowest-dimension P- and T-violating operators that can be added to the QCD Lagrangian, the dimension four QCD theta term and five dimension six operators, quark electric and chromo-electric dipole moments, gluon chromo-electric dipole moment and two four-quark operators. We construct the low-energy interactions between pion, nucleon and photons stemming from each fundamental source and discuss the implications for the electric dipole moments (EDMs) of nucleon, deuteron, triton and helion. We show how the different properties under chiral symmetry of the microscopic sources result in qualitative different relations between EDMs of one, two and three nucleon systems, which, if observed, would offer important clues on the fundamental mechanism of T-violation.
Title: The t-tbar forward-backward asymmetry
Abstract: We review the experimental results related to the t-tbar forward-backward asymmetry at the Tevatron, the standard model predictions, how it can be accommodated by new physics, and possible related signals at the LHC.
Title: SCET, QCD and Wilson Lines
Abstract: Soft Collinear Effective Theory (SCET) is an effective field theory which describes the interactions of low invariant mass
jets which are highly boosted with respect to one another. In the standard formulation of SCET, the effective Lagrangian for collinear fields is expanded in inverse powers of the energy. At leading order this leads to manifest decoupling of soft and collinear degrees of freedom; however, subleading terms in the effective Lagrangian violate this manifest decoupling. In this talk I argue that the collinear expansion in the SCET Lagrangian is unnecessary, and that the SCET Lagrangian may instead be written as multiple decoupled copies of QCD. The interactions between the sectors in full QCD are reproduced in the effective theory by an external current consisting of QCD fields coupled to Wilson lines.