Graduate School in Physics and Astrophysics
-------------------------------------------
ANNUAL REPORT
-------------------------------------------
Fill with a text editor (without TAB or formatting)
Repeat fields for each course as necessary.
-------------------------------------------
name: Giulio Falcioni
email: falcioni@to.infn.it
ciclo: XXVII
year completed (1,2 or 3): 2
supervisor: Lorenzo Magnea
-------------------------------------------
GRADUATE SCHOOL COURSES
(only completed courses, with examination passed in the year)
code: 01
title: Gravitational waves
teacher: A. Nagar
hours: 12
code: 02
title: Effective field theories for heavy-quark physics
teacher: P. Gambino
hours: 10
code:03
title:Inference and analysis of information flow in complex systems
teacher:Stramaglia, Caselle
hours:10
code: 04
title: Non-perturbative methods for quark-gluon plasma physics
teacher: C. Ratti, M. Nardi
hours:12
code: 05
title: Non-perturbative solutions in filed theory: solitons and instantons
teacher: M. BillĂ˛
hours: 10
-------------------------------------------
SUMMER SCHOOLS, INTERNATIONAL SCHOOLS
(only those attended in the current year)
title: Lezioni di dottorato in fisica teorica
place: Padova
webpage: http://webtheory.sns.it/lezionidottorato/
days: 5
talk or poster (Y/N): N
title: School of analytic computing in theoretical high-energy physics
place: Atrani
webpage: http://www.lhcphenonet.eu/atrani2013/
days: 5
talk or poster (Y/N): N
-------------------------------------------
VISITS AND STAGES
(only those done in the current year)
institution: University of Edinburgh
place: Edinburgh
starting date: 5/6/2013
days: 10
institution: CERN
place: Geneva
starting date: 26/8/2013
days: 5
---------------------------------------------------
Research activity/Publications in the current year
(max characters 2500)
BE AWARE: research activity and Pubs are not evaluated as didactic credits,
but are requested to trace the PhD students' career
My research activity concerns perturbative QCD. During the current year I investigated two issues: the high energy limit of QCD scattering amplitudes and the calculation of the soft anomalous dimension at three loops.
Regarding the first topic, I worked in collaboration with L. Magnea, L. Vernazza and V. Del Duca (INFN Frascati and CERN) in order to pinpoint the origin of the breaking of the Regge factorization of QCD scattering amplitudes at two loops. Indeed, QCD amplitudes become very simple in the high energy limit and in first approximation they are obtained by replacing the propagator of the exchanged gluon with a "Reggeized propagator" which takes into account for the leading logarithmic enhancements (LL) at all orders. This propagator is the building block for the Regge factorization formula, which holds for all the QCD amplitudes up to the next-to-leading logarithmic approximation (NLL). However, the factorization breaks down at NNLL, starting at two loops. We found that soft gluons are the origin of this effect and we proved that the same operator which governs the infrared singularities of the scattering amplitudes breaks the Regge factorization at NNLL. We discussed this result in a paper we submitted to Physics Letters B.
As for the second topic, I worked in collaboration with L. Magnea, E. Gardi and M. Harley (Edinburgh) and C. White (Glasgow). Our study concerned a class of diagrams contributing to the soft anomalous dimension at three loops. The soft anomalous dimension governs the infrared singularities of fixed-angle QCD scattering amplitudes and at present it's known up to two loops. We found that the abelian-like diagrams, which involve only multiple gluon exchanges, can't entangle more than two partons. This is true at three loops and there are hints pointing to the generalization of this feature at higher orders. A paper is in preparation regarding this aspects.