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Responsabile Marta Ruspa
Settore di ricerca Fisica Applicata
Personale docente Michele Arneodo   
Personale non-docente Maria Margherita Obertino                     
Obiettivi della ricerca 1) Studio dell`interazione nucleare forte mediante collisioni positrone-protone al collisore HERA presso il laboratorio DESY di Amburgo.
Risultati ottenuti 1) La ricerca qui discussa si svolge presso il Deutsches Elektronen-Synchrotron (DESY) (http://www.desy.de) di Amburgo. A DESY è stato in funzione fino al 2007 HERA, un anello di collisioni che accelerava elettroni (e) fino a un`energia di 27.5 GeV e protoni (p) fino a 920 GeV, permettendo collisioni con una risoluzione spaziale dell`ordine di 10^-18m. M. Arneodo e M. Ruspa fanno parte della collaborazione internazionale ZEUS (http://www-zeus.desy.de) che ha costruito un sistema di rivelatori per particelle in corrispondenza di uno dei punti di incontro dei due fasci di HERA. Le collisioni studiate tra un oggetto puntiforme, quale l`elettrone, e il protone permettono di indagare la struttura del protone. Ad HERA era installato un secondo sistema di rivelazione con scopi analoghi, facente capo alla collaborazione internazionale H1 (http://www-h1.desy.de).
L`attività nel 2012 si è concentrata sulla combinazione di misure, effettuate e pubblicate da ZEUS e H1, del processo di
diffrazione inclusiva ep --> eXp, in cui il protone emerge dalla collisione intatto e con energia prossima a quella del fascio (con X si indica l`insieme di particelle, per lo più pioni, che vengono create nella collisione). L`ottenimento di un set di dati unico e` il primo passo verso l`estrazione
di funzioni di densita` partoniche diffrattive - una delle importanti ed attese eredita` di HERA. E` stata anche misurata la funzione di struttura diffrattiva del protone in una regione cinematica finora inesplorata. 
Obiettivi della ricerca 2) Studio delle prestazioni dei rivelatori al silicio per radiazione ionizzante "pixel 3D edgeless detectors".
Risultati ottenuti 2) I rivelatori al silicio "pixel 3D edgeless detectors" possono avere applicazioni nel campo della diagnostica medica per immagini oltre che della fisica delle alte energie. Sono stati caratterizzati in laboratorio e su fascio (presso il laboratorio Fermilab di Chicago, http://www.fnal.gov/) rivelatori 3D prodotti alla Sintef (Oslo, Norvegia) e alla FBK (Trento) con elettrodi di varia configurazione.  
Obiettivi della ricerca 3) Studio di collisioni protone-protone al collisore LHC presso il laboratorio CERN di Ginevra.
Risultati ottenuti 3) Si veda la scheda del Prof. Arneodo. 
Collaborazioni in atto M. Arneodo e M. Ruspa fanno parte della collaborazione ZEUS che consiste di circa 450 fisici appartenenti ai seguenti paesi: Canada, Corea, Germania, Giappone, Gran Bretagna, Israele, Italia (Bologna, Cosenza, Firenze, Padova, Piemonte Orientale, Roma, Torino), Kazakhistan, Olanda, Polonia, Russia, Spagna, USA. Per maggiori dettagli, si veda http://www-zeus.desy.de .

M. Arneodo, M.M. Obertino e M. Ruspa fanno inoltre parte della collaborazione CMS, che consiste di circa 2500 fisici appartenenti a 152 Universita` e Laboratori di 36 paesi. Per maggiori dettagli, si veda http://cmsinfo.cern.ch/Welcome.html/ .
 
Comunicazioni a congressi M. Ruspa, "Combined measurement of the inclusive diffractive cross section at HERA", poster presentato a "The 2011 Europhysics Conference on High Energy Physics-HEP 2011 (EPS 2011)", 21-27 luglio 2011, Grenoble.
 
Pubblicazioni
Observation and studies of jet quenching in PbPb collisions at root s(NN)=2.76 TeV
Search for a W` boson decaying to a muon and a neutrino in pp collisions at root s=7 TeV
Measurements of inclusive W and Z cross sections in pp collisions at root s=7 TeV
Search for Stopped Gluinos in pp Collisions at root s=7 TeV
Charged particle multiplicities in pp interactions at root s=0:9, 2:36, and 7 TeV
Search for Dijet Resonances in 7 TeV pp Collisions at CMS (vol 105, 211801, 2010)
First measurement of the cross section for top-quark pair production in proton-proton collisions at root s=7 TeV
Measurement of beauty production in deep inelastic scattering at HERA using decays into electrons
Measurement of the Isolated Prompt Photon Production Cross Section in pp Collisions at root s=7 TeV
Prompt and non-prompt J/psi production in pp collisions at root s=7 TeV
Search for heavy stable charged particles in pp collisions at root s=7 TeV
Measurement of B(B)over-bar angular correlations based on secondary vertex reconstruction at root s=7 TeV
Inclusive b-hadron production cross section with muons in pp collisions at root s=7 TeV
Measurement of the energy dependence of the total photon-proton cross section at HERA
Measurement of the B(+) Production Cross Section in pp Collisions at root s=7 TeV
Search for microscopic black hole signatures at the Large Hadron Collider
Dijet Azimuthal Decorrelations in pp Collisions at root s=7 TeV
Search for a heavy gauge boson W` in the final state with an electron and large missing transverse energy in pp collisions at root s=7 TeV
Measurement of the lepton charge asymmetry in inclusive W production in pp collisions at root s=7TeV
Search for supersymmetry in pp collisions at 7 TeV in events with jets and missing transverse energy
Strange particle production in pp collisions at root s=0.9 and 7 TeV
Measurement of Bose-Einstein correlations in pp collisions at root s=0.9 and 7 TeV
Measurement of heavy-quark jet photoproduction at HERA
Search for resonances in the dilepton mass distribution in pp collisions at root s=7 TeV
Search for large extra dimensions in the diphoton final state at the Large Hadron Collider
First measurement of hadronic event shapes in pp collisions at root s=7 TeV
Measurement of W(+)W(-) production and search for the Higgs boson in pp collisions at root s=7 TeV
Search for Pair Production of First-Generation Scalar Leptoquarks in pp Collisions at root s=7 TeV
Search for Pair Production of Second-Generation Scalar Leptoquarks in pp Collisions at root s=7 TeV
Measurement of Dijet Angular Distributions and Search for Quark Compositeness in pp Collisions at root s=7 TeV
Search for Supersymmetry in pp Collisions at root s=7 TeV in Events with Two Photons and Missing Transverse Energy
Study of Z Boson Production in PbPb Collisions at root s(NN)=2.76 TeV
Search for physics beyond the standard model in opposite-sign dilepton events in pp collisions at root s=7 TeV
Search for supersymmetry in events with a lepton, a photon, and large missing transverse energy in pp collisions at root s=7 TeV
Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy at the LHC
Search for Neutral Minimal Supersymmetric Standard Model Higgs Bosons Decaying to Tau Pairs in pp Collisions at root s=7 TeV
Measurement of the differential dijet production cross section in proton-proton collisions at root s=7 TeV
Upsilon production cross section in pp collisions at root s=7 TeV
Measurement of the B(0) Production Cross Section in pp Collisions at root s=7 TeV
Search for light resonances decaying into pairs of muons as a signal of new physics
Measurement of the t(t)over-bar production cross section and the top quark mass in the dilepton channel in pp collisions at root s=7 Tev
Search for supersymmetry in events with b jets and missing transverse momentum at the LHC
Long-range and short-range dihadron angular correlations in central PbPb collisions at root s(NN)=2.76 TeV
Search for a heavy bottom-like quark in pp collisions at root s=7 TeV
Measurement of the Polarization of W Bosons with Large Transverse Momenta in W plus jets Events at the LHC
Measurement of W gamma and Z gamma production in pp collisions at root s=7 TeV
Indications of Suppression of Excited Upsilon States in Pb-Pb Collisions at root(s)NN=2.76 TeV
Search for same-sign top-quark pair production at root s=7 TeV and limits on flavour changing neutral currents in the top sector
Dependence on pseudorapidity and on centrality of charged hadron production in PbPb collisions at root s(NN)=2.76 TeV
Search for supersymmetry in pp collisions at root s=7 TeV in events with a single lepton, jets, and missing transverse momentum
Measurement of the inclusive Z cross section via decays to tau pairs in pp collisions at root s=7 TeV
Charged particle transverse momentum spectra in pp collisions at root s=0.9 and 7 TeV
Search for new physics with jets and missing transverse momentum in pp collisions at root s=7 TeV
Measurement of the t-Channel Single Top Quark Production Cross Section in pp Collisions at root s=7 TeV
Measurement of the ratio of the 3-jet to 2-jet cross sections in pp collisions at root s=7 TeV
Missing transverse energy performance of the CMS detector
Measurement of the t(t)over-bar production cross section in pp collisions at root s=7 TeV using the kinematic properties of events with leptons and jets
Measurement of the underlying event activity at the LHC with root s=7 TeV and comparison with root s=0.9 TeV
Search for Three-Jet Resonances in pp Collisions at sqrt[s]=7TeV.
Search for first generation scalar leptoquarks in the e nu jj channel in pp collisions at root s=7 TeV
Measurement of the Inclusive Jet Cross Section in pp Collisions at root s=7 TeV
Measurement of the B(s)(0) Production Cross Section with B(s)(0) -> J/psi phi Decays in pp Collisions at root s=7 TeV
Measurement of the inclusive W and Z production cross sections in pp collisions at root s = 7 TeV with the CMS experiment
Measurement of the Drell-Yan cross section in pp collisions at root s=7 TeV
A search for excited leptons in pp collisions at root s=7 TeV
Search for resonances in the dijet mass spectrum from 7 TeV pp collisions at CMS
Search for physics beyond the standard model using multilepton signatures in pp collisions at root s=7 TeV
Search for B(s)(0) -> mu(+)mu(-) and B(0) -> mu(+)mu(-) Decays in pp Collisions at root s=7 TeV
Search for New Physics with a Monojet and Missing Transverse Energy in pp Collisions at root s=7 TeV
Measurement of the t(t)over-bar production cross section in pp collisions at 7 TeV in lepton plus jets events using b-quark jet identification
Search for Supersymmetry at the LHC in Events with Jets and Missing Transverse Energy
Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC
Search for a Vectorlike Quark with Charge 2/3 in t plus Z Events from pp Collisions at root s 7 TeV