Graduate School in Physics and Astrophysics
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ANNUAL REPORT
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name: Chiara Signorile-Signorile
email: chiara.signorile@to.infn.it
ciclo: XXXIII
year completed (1,2 or 3): 1
supervisor: Lorenzo Magnea
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GRADUATE SCHOOL COURSES
(only completed courses, with examination passed in the year)
code: T01
title: Introduction to lattice field theory
teacher: Marco Panero
hours: 20
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COURSES FROM OTHER GRADUATE SCHOOLS
(only completed courses, with examination passed in the year)
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teacher:
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UNDERGRADUATE COURSES (Laurea Magistrale)
(only completed courses, with examination passed in the year)
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teacher:
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TEACHING HOURS
course: Struttura della Materia-Laboratorio
year: 2018
teacher: Paolo Olivero
hours: 25
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SUMMER SCHOOLS, INTERNATIONAL SCHOOLS
(only those attended in the current year)
title: GGI Lectures on the Theory of Fundamental Interactions
place: Galileo Galilei Institute of Theoretical Physics, Firenze
webpage: http://webtheory.sns.it/ggilectures2018/
days: 8-26 January 2018
talk or poster (Y/N): N
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CONFERENCES, WORKSHOP
(only those attended in the current year)
title: 33rd Conference of Physics Student
place: Helsinki, Finland
webpage: https://icps.helsinki.fi
days: 7 - 14 August 2018
talk or poster (Y/N): Y (talk)
title: 104Â° Congresso Nazionale SocietÃ Italiana di Fisica
place: Rende, Cosenza
webpage: http://www.fis.unical.it/sif2018/
days: 7 - 21 September 2018
talk or poster (Y/N): Y (talk)
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VISITS AND STAGES
(only those done in the current year)
institution:
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Research activity
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My research activity concerns the study of infrared singularities in the framework of perturbative QCD. In particular, my work is focused on the formal techniques that allow a complete factorisation of these singularities from a generic scattering amplitude. It is a well-known evidence that one can collect all the soft and collinear singularities by introducing a set of universal functions, the jet and the soft function respectively, defined through fields operators and Wilson lines. The details of the investigated process are encapsulated in a finite remainder. This sophisticated machinery is largely applied to those processes which involve collinear configurations between a hard fermion and an arbitrary number of gluons, i.e. for fermion jet function, but it has not been fully formalised yet for gluon-induced processes.
In the first part of the year, I worked on the operator definition of a gluon jet function, analysing its properties under gauge transformations. A specific application of this study regards the subtraction schemes of infrared divergences. At next-to-leading order approximation, general theorems guarantee that infrared safe observables are finite: the explicit poles of the virtual contribution cancel the phase space poles of the real-radiation corrections. However, this cancellation is not manageable in actual calculations, because typical hadron-collider observables have a complicated phase-space structure and real-radiation matrix elements are increasingly intricate, preventing an analytical approach. On the other hand, numerical integrations are not able to handle infinitely large terms, i.e. the virtual and the real singularities. Therefore, the aim of my research is to define a set of counterterms that can reproduce the real matrix elements in the singular limit, but that are sufficiently simple to be integrated analytically. My project covers two specific aspects of the same problem: on the one hand the subtraction procedure can be interpreted as an application of the factorisation theory, that allows a formal definition of the counterterms from first principles. On the other hand, a plethora of technical procedures is necessary to provide an efficient recipe to compute realistic hadron-collider observables. Current lines of research include the development of an efficient subtraction algorithm for NLO and NNLO processes and novel theoretical investigations of the factorisation approach to the subtraction scheme at NNNLO.
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Publications in the current year
[1] L.Magnea, E.Maina, G.Pelliccioli, C.Signorile-Signorile, P.Torrielli, S.Uccirati
Local Analytic Sector Subtraction at NNLO
Positively reviewed by JHEP
arXiv:1806.09570 [hep-ph]
[2] L.Magnea, E.Maina, G.Pelliccioli, C.Signorile-Signorile, P.Torrielli, S.Uccirati
Factorisation and Subtraction beyond NLO
Prepared for submission to JHEP
arXiv:1809.054444 [hep-ph]
[3] L.Magnea, E.Maina, G.Pelliccioli, C.Signorile-Signorile, P.Torrielli, S.Uccirati
Analytical tools for IR subtraction beyond NLO
Contribution to the Workshop "Loops and Legs in quantum Field Theory" (St. Goar, Germany, 29 April-04 May 2018 - 29)
To appear
BE AWARE: research activity and Pubs are not evaluated as didactic credits,
but are requested to trace the PhD students' career