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Responsabile Michele Arneodo
Settore di ricerca Fisica Applicata
Personale docente Marta Ruspa   
Personale non-docente Maria Margherita Obertino                     
Obiettivi della ricerca 1) Studio di collisioni protone-protone al collisore LHC presso il laboratorio CERN di Ginevra.
Risultati ottenuti 1) Al CERN, l`organizzazione europea per la ricerca nucleare (http://www.cern.ch), è in funzione il Large Hadron Collider (LHC), un anello di collisioni in grado di accelerare due fasci di protoni (p) fino a un`energia di 7000 GeV e poi farli scontrare. M. Arneodo, M.M. Obertino e M. Ruspa sono membri della collaborazione internazionale CMS (http://cmsdoc.cern.ch) che ha allestito un sistema di rivelatori che misurano i prodotti delle collisioni. Lo scopo principale del LHC è l`indagine della struttura della materia e delle interazioni tra i suoi costituenti, con risoluzione spaziale e a una scala di energia mai raggiunte finora.

L`attività del gruppo di Novara si è concentrata sugli aspetti seguenti:

o) Coordinamento delle analisi di eventi diffrattivi.

o) Studio della fattibilità di rivelare eventi con protoni diffusi di energia pari almeno all`80% di quella dei protoni incidenti utilizzando l`apparato CMS e uno spettrometro per protoni posto lungo la linea di fascio del LHC a 240 e 420m dal punto di interazione. Eventi di questo genere possono derivare dalla produzione centrale esclusiva di un borsone di Higgs e possono essere utilizzati per determinarne i numeri quantici.

o) Coordinamento della calibrazione del calorimetro elettromagnetico. 
Obiettivi della ricerca 2) Studio dell`interazione nucleare forte mediante collisioni positrone-protone al collisore HERA presso il laboratorio DESY di Amburgo.
Risultati ottenuti 2) Si veda la scheda della Dott.ssa Ruspa 
Obiettivi della ricerca 3) Studio delle prestazioni dei rivelatori al silicio per radiazione ionizzante "pixel 3D edgeless detectors".
Risultati ottenuti 3) Si veda la scheda della Dott.ssa Ruspa 
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. Arneodo  ha fatto parte dell`International Advisory Committee di LISHEP 2011, 4-10 luglio 2011, Rio de Janeiro

M.M. Obertino, "Another LHC application of 3D sensors: the HPS project", TREDI 2011 - 6TH TRENTO WORKSHOP ON ADVANCED SILICON RADIATION DETECTORS, TRENTO, 2-4 MARZO 2011 
Pubblicazioni
Search for a Vectorlike Quark with Charge 2/3 in t plus Z Events from pp Collisions at root s 7 TeV
Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC
Search for Supersymmetry at the LHC in Events with Jets and Missing Transverse Energy
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 New Physics with a Monojet and Missing Transverse Energy 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 physics beyond the standard model using multilepton signatures in pp collisions at root s=7 TeV
Search for resonances in the dijet mass spectrum from 7 TeV pp collisions at CMS
A search for excited leptons in pp collisions at root s=7 TeV
Measurement of the Drell-Yan cross section 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 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 Jet Cross Section in pp Collisions at root s=7 TeV
Search for first generation scalar leptoquarks in the e nu jj channel in pp collisions at root s=7 TeV
Search for Three-Jet Resonances in pp Collisions at sqrt[s]=7TeV.
Measurement of the underlying event activity at the LHC with root s=7 TeV and comparison with root s=0.9 TeV
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
Missing transverse energy performance of the CMS detector
Measurement of the ratio of the 3-jet to 2-jet cross sections 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
Search for new physics with jets and missing transverse momentum in pp collisions at root s=7 TeV
Charged particle transverse momentum spectra in pp collisions at root s=0.9 and 7 TeV
Measurement of the inclusive Z cross section via decays to tau pairs in pp collisions at root s=7 TeV
Search for supersymmetry in pp collisions at root s=7 TeV in events with a single lepton, jets, and missing transverse momentum
Dependence on pseudorapidity and on centrality of charged hadron production in PbPb 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
Indications of Suppression of Excited Upsilon States in Pb-Pb Collisions at root(s)NN=2.76 TeV
Measurement of W gamma and Z gamma production 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
Search for a heavy bottom-like quark in pp collisions at root s=7 TeV
Long-range and short-range dihadron angular correlations in central PbPb collisions at root s(NN)=2.76 TeV
Search for supersymmetry in events with b jets and missing transverse momentum at the LHC
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 light resonances decaying into pairs of muons as a signal of new physics
Measurement of the B(0) Production Cross Section in pp Collisions at root s=7 TeV
Upsilon production cross section 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
Search for Neutral Minimal Supersymmetric Standard Model Higgs Bosons Decaying to Tau Pairs 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 supersymmetry in events with a lepton, a photon, and large missing transverse energy in pp collisions at root s=7 TeV
Search for physics beyond the standard model in opposite-sign dilepton events in pp collisions at root s=7 TeV
Study of Z Boson 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 Two Photons and Missing Transverse Energy
Measurement of Dijet Angular Distributions and Search for Quark Compositeness 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
Search for Pair Production of First-Generation Scalar Leptoquarks 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
First measurement of hadronic event shapes in pp collisions at root s=7 TeV
Search for large extra dimensions in the diphoton final state at the Large Hadron Collider
Search for resonances in the dilepton mass distribution in pp collisions at root s=7 TeV
Measurement of heavy-quark jet photoproduction at HERA
Measurement of Bose-Einstein correlations in pp collisions at root s=0.9 and 7 TeV
Strange particle production in pp collisions at root s=0.9 and 7 TeV
Search for supersymmetry in pp collisions at 7 TeV in events with jets and missing transverse energy
Measurement of the lepton charge asymmetry in inclusive W production in pp collisions at root s=7TeV
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
Dijet Azimuthal Decorrelations in pp Collisions at root s=7 TeV
Search for microscopic black hole signatures at the Large Hadron Collider
Measurement of the B(+) Production Cross Section in pp Collisions at root s=7 TeV
Measurement of the energy dependence of the total photon-proton cross section at HERA
Inclusive b-hadron production cross section with muons 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
Search for heavy stable charged particles in pp collisions at root s=7 TeV
Prompt and non-prompt J/psi production in pp collisions at root s=7 TeV
Measurement of the Isolated Prompt Photon Production Cross Section in pp Collisions at root s=7 TeV
Measurement of beauty production in deep inelastic scattering at HERA using decays into electrons
First measurement of the cross section for top-quark pair production in proton-proton collisions at root s=7 TeV
Search for Dijet Resonances in 7 TeV pp Collisions at CMS (vol 105, 211801, 2010)
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
Measurements of inclusive W and Z cross sections in pp collisions at root s=7 TeV