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| ESPERIMENTO PD21, RESPONSABILE: Andrea Wulzer |
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I principali temi di ricerca recentemente affrontati sono
i seguenti.
1) CORREZIONI RADIATIVE NEL MODELLO STANDARD
* Momenti magnetici anomali dei leptoni.
* Correzioni a 2 loop alla produzione e ai decadimenti
del bosone di Higgs.
2) FENOMENOLOGIA DEI NEUTRINI E MODELLI
* Modelli con angolo di mixing atmosferico massimale.
Simmetrie di sapore con gruppi discreti.
3) ESTENSIONI SUPERSIMMETRICHE DEL MODELLO STANDARD
* Violazione del sapore e di CP nei settori adronico e
leptonico in modelli supersimmetrici. Connessioni con
masse dei neutrini, leptogenesi, grande unificazione.
* Correzioni forti a operatori di dipolo elettrici
e magnetici nel MSSM.
* Modelli con scalari superpesanti (`split susy').
Implicazioni per acceleratori, momenti di dipolo
elettrici e materia oscura.
4) ESTENSIONI DEL MODELLO STANDARD CON DIMENSIONI EXTRA
* Compattificazioni di superstringhe con flussi e loro
teorie efficaci di supergravita'. Rottura della
supersimmetria, stabilizzazione dei moduli,
implicazioni fenomenologiche.
* Teorie di grande unificazione con dimensioni extra:
masse dei fermioni, decadimento del protone.
* Rottura della supersimmetria in dimensioni extra.
* Segnali di gravitoni agli acceleratori in teorie con
dimensioni extra grandi.
* Modelli 'Higgsless' con una dimensione extra.
Unitarieta', test di precisione, segnali agli
acceleratori.
5) ALTRE ESTENSIONI DEL MODELLO STANDARD
* Modelli con settore scalare esteso.
6) COSMOLOGIA E FISICA ASTROPARTICELLARE
* Modelli inflazionari e perturbazioni cosmologiche.
* Modelli per l'energia oscura.
* Materia oscura: candidati, abbondanza, rivelazione.
* Leptogenesi.
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| OBIETTIVI DELL'ESPERIMENTO PD21 |
PHENOMENOLOGY OF FUNDAMENTAL INTERACTIONS, WITHIN AND BEYOND THE STANDARD MODEL
This project is centered on the phenomenology of the fundamental interactions, within and beyond the Standard Model. The main subjects of our investigation are: radiative corrections in the Standard Model; supersymmetric and grand unified models; models with a strongly interacting Higgs sector and/or with extra dimensions; phenomenology of neutrino oscillations and structure of the lepton and quark mass matrices; flavour and CP violation; astroparticle physics and cosmology.
The main topics of our recent research are listed below.
1) PHYSICS BEYOND THE STANDARD MODEL
* Characterisation of Higgs couplings: custodial breaking couplings and LHC constraints; low-energy theorems in double Higgs production of a composite Higgs; anomalous t tbar hh coupling in double Higgs production; strongly-coupled Higgs with a Minimal Flavor violating ansatz; the effect of new spin-one resonances responsible for the unitarization of the vector boson scattering amplitude; implications of a light sgoldstino on the Higgs physics.
* Vector boson scattering: theoretical study of the validity of the effective vector boson approximation.
* Study of spin-1composite resonances at LHC in a 4-site model supplemented by a composite Higgs. The charged di-boson production is analyzed. The issue of interference effects is faced for extra W' searches.
* Simplified description of composite Higgs models in 4D and implications of light Higgs boson mass for LHC.
* Lepton flavour: construction and analysis of models for lepton mixing angles, based on discrete symmetries and on grand-unified scenarios.
* New realisations of flavour structure in composite Higgs models.
2) RADIATIVE CORRECTIONS AND HIGH ORDER PROCESSES
* Anomalous magnetic moment of leptons: improved bound on new-physics contribution to the electron g-2, through new measurements of a_e and more refined determinations of alpha; possible measurement of the tau g-2.
* New Methods for Scattering Amplitudes: an improved version of integrand-reduction method for one-loop amplitudes; extension of the one-loop integrand decomposition to higher-rank integrand; progresses in multi-loop integrand reduction.
3) COSMOLOGY AND ASTROPARTICLE PROBLEMS
Study of the growth of cosmological perturbations in the non-linear regime, development of a new approach to the resummation of perturbative contributions at infinite orders, based on time-dependent evolution equations for the matter power spectrum for the density and the velocity field.
4) EFFECTIVE SUPERGRAVITY THEORIES
Study of the spontaneous braking of N=8 supergravity, in the hope of grasping some new qualitative aspect on the breaking of the EW symmetry and on the Hierarchy Problem. |
Istituto Nazionale di Fisica Nucleare - Piazza dei Caprettari, 70 - 00186 Roma
tel. +39 066840031 - fax +39 0668307924 - email: presidenza@presid.infn.it
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