Ph.D in applied physics (HEP), former physics researcher at Padova University and CERN, currently physics and math teacher, with interest in different fields as philosophy of science and mind, theology and the connections among them, and strong aim on foundation of physics and ultimate questions.
A search for supersymmetry in final states with jets and missing transverse energy is performed i... more A search for supersymmetry in final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of $ \sqrt{s}=7 $ TeV. The data sample corresponds to an integrated luminosity of 4.98 fb−1 collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, α T, is used as the main discriminator between events with genuine and misreconstructed missing transverse energy. The search is performed in a signal region that is binned in the scalar sum of the transverse energy of jets and the number of jets identified as originating from a bottom quark. No excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of the constrained minimal supersymmetric extension of the standard model, and also in simplified models, with a special emphasis on compressed spectra and third-generation scenarios.
A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton+jets ... more A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton+jets data sample recorded by the CMS experiment at the LHC in pp collisions at sqrt(s) = 7 TeV corresponding to an integrated luminosity of 5.0 inverse femtobarns. No significant deviations from the standard model background are observed. Upper limits are presented for the production cross section times branching fraction of top quark-antiquark resonances for masses from 750 to 3000 GeV. In particular, the existence of a leptophobic topcolor particle Z' is excluded at the 95% confidence level for resonance masses M[Z'] < 1.3 TeV for Gamma[Z'] = 0.012 M[Z'], and M[Z'] < 1.9 TeV for Gamma[Z'] = 0.10 M[Z'].
CERN-LHC. Measurements of jet characteristics from inclusive jet production in proton-proton coll... more CERN-LHC. Measurements of jet characteristics from inclusive jet production in proton-proton collisions at a centre-of-mass energy of 7 TeV are presented. The data sample was collected with the CMS detector at the LHC during 2010 and corresponds to an integrated luminosity of 36 inverse picobarns. The mean charged hadron multiplicity, the differential and integral jet shape distributions, and two independent moments of the shape distributions are measured as functions of the jet transverse momentum for jets reconstructed with the anti-kT algorithm. The measured observables are corrected to the particle level. In Tables 1-125, the differential jet shape $\rho(r)$ is already corrected for the unfolding correction factor, CF, listed in the table. In Tables 1-125, three sources of systematic uncertainties for $\rho(r)$ are presented separately for completeness, and DSYS is a quadratic summation of these three systematic uncertainties.
CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in... more CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in Lead-Lead collisions at a centre of mass energy per nulceon of 2.76 TeV. The elliptic anisotropy parameter, V2, defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method (EP), two- and four-particle cumulants (C2 and C4) ad Lee-Yang zeros (LYZ). V2 is presented as a function of transverse momentum PT, pseudorapidity (ETARAP) over the ranges in PT of 0-3 GeV, in |ETARAP| <2.4 and in 12 classes of centrality from 0-80%.
CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in... more CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in Lead-Lead collisions at a centre of mass energy per nulceon of 2.76 TeV. The elliptic anisotropy parameter, V2, defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method (EP), two- and four-particle cumulants (C2 and C4) ad Lee-Yang zeros (LYZ). V2 is presented as a function of transverse momentum PT, pseudorapidity (ETARAP) over the ranges in PT of 0-3 GeV, in |ETARAP| <2.4 and in 12 classes of centrality from 0-80%.
CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in... more CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in Lead-Lead collisions at a centre of mass energy per nulceon of 2.76 TeV. The elliptic anisotropy parameter, V2, defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method (EP), two- and four-particle cumulants (C2 and C4) ad Lee-Yang zeros (LYZ). V2 is presented as a function of transverse momentum PT, pseudorapidity (ETARAP) over the ranges in PT of 0-3 GeV, in |ETARAP| <2.4 and in 12 classes of centrality from 0-80%.
CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in... more CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in Lead-Lead collisions at a centre of mass energy per nulceon of 2.76 TeV. The elliptic anisotropy parameter, V2, defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method (EP), two- and four-particle cumulants (C2 and C4) ad Lee-Yang zeros (LYZ). V2 is presented as a function of transverse momentum PT, pseudorapidity (ETARAP) over the ranges in PT of 0-3 GeV, in |ETARAP| <2.4 and in 12 classes of centrality from 0-80%.
CERN-LHC. Measurement of the production cross sections for Upsilon 1S, 2S and 3S mesons in proton... more CERN-LHC. Measurement of the production cross sections for Upsilon 1S, 2S and 3S mesons in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample has an integrated luminosity of 3.1 pb-1 with an uncertainrty of 11%. Cross sections are given for the assumption of unpolarized upsilon production but the fractional change(%) of the cross section is shown in the tables where L(T) refers to fully-longitudinal(-transverse) polarization in the helicity(HX) and the Collins-Sopper(CS) frames. All cross sections are for the di-muon decay mode of the upsilon (ie not correctd for the branching ratio) and the integrated cross sections are over the specified kinematic ranges.
CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in... more CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in Lead-Lead collisions at a centre of mass energy per nulceon of 2.76 TeV. The elliptic anisotropy parameter, V2, defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method (EP), two- and four-particle cumulants (C2 and C4) ad Lee-Yang zeros (LYZ). V2 is presented as a function of transverse momentum PT, pseudorapidity (ETARAP) over the ranges in PT of 0-3 GeV, in |ETARAP| <2.4 and in 12 classes of centrality from 0-80%.
CERN-LHC. First measurement of hadronic event shapes in P P collisions at a centre-of-mass energy... more CERN-LHC. First measurement of hadronic event shapes in P P collisions at a centre-of-mass energy of 7 TeV. The data were collected between April and August 2010 and have a total integrated luminosity of 3.2 pb-1. Jet clustering uses the anti-KT algorithm with R=0.5 with a single-jet trigger requiring jet |pseudorapidity| < 5 and jet PT > 30 GeV in the low PT bin and > 50 GeV in the medium and high PT bins. Data on two event shape variables, the Central Transverse Thrust and the Central Trust Minor are presented. Numerical values were supplied by M A Weber.
CERN-LHC. Measurement of charged hadron multiplicity densities in Lead-Lead collisions, collected... more CERN-LHC. Measurement of charged hadron multiplicity densities in Lead-Lead collisions, collected with a minimum-bias trigger, at a centre-of-mass energy of 2.76 TeV per nucleon pair. Data are presented as functions of the centrality class, the charged hadron pseudorapidity and the number of participating nucleons, determined from a Glauber MC simulation.
CERN-LHC. Measurement of the total inclusive and differential cross sections in transverse moment... more CERN-LHC. Measurement of the total inclusive and differential cross sections in transverse momentum and pseudorapidity for B hadron -> muon X production in proton-proton collisions at a centre of mass energy of 7 TeV. The data sample used has an integrated luminosity of 85 nb-1 with the results covering the muon transverse momentum range > 6 GeV and |pseudorapidity| < 2.1.
CERN-LHC. Measurement of the spectra of strange hadrons (KS, LAMBDA,XI- and their antiparticles) ... more CERN-LHC. Measurement of the spectra of strange hadrons (KS, LAMBDA,XI- and their antiparticles) produced in proton-proton collisions at centre-of-mass energies of 0.9 and 7 TeV. The data, presented as functions of transverse momentum and rapidity, are from data samples of integrated luminosity 240mub-1 (0.9 TeV) and 480 mub-1 (7 TeV) collected during the spring of 2010. Numerical values supplied by K.Stenson.
A search for supersymmetry in final states with jets and missing transverse energy is performed i... more A search for supersymmetry in final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of $ \sqrt{s}=7 $ TeV. The data sample corresponds to an integrated luminosity of 4.98 fb−1 collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, α T, is used as the main discriminator between events with genuine and misreconstructed missing transverse energy. The search is performed in a signal region that is binned in the scalar sum of the transverse energy of jets and the number of jets identified as originating from a bottom quark. No excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of the constrained minimal supersymmetric extension of the standard model, and also in simplified models, with a special emphasis on compressed spectra and third-generation scenarios.
A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton+jets ... more A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton+jets data sample recorded by the CMS experiment at the LHC in pp collisions at sqrt(s) = 7 TeV corresponding to an integrated luminosity of 5.0 inverse femtobarns. No significant deviations from the standard model background are observed. Upper limits are presented for the production cross section times branching fraction of top quark-antiquark resonances for masses from 750 to 3000 GeV. In particular, the existence of a leptophobic topcolor particle Z' is excluded at the 95% confidence level for resonance masses M[Z'] < 1.3 TeV for Gamma[Z'] = 0.012 M[Z'], and M[Z'] < 1.9 TeV for Gamma[Z'] = 0.10 M[Z'].
CERN-LHC. Measurements of jet characteristics from inclusive jet production in proton-proton coll... more CERN-LHC. Measurements of jet characteristics from inclusive jet production in proton-proton collisions at a centre-of-mass energy of 7 TeV are presented. The data sample was collected with the CMS detector at the LHC during 2010 and corresponds to an integrated luminosity of 36 inverse picobarns. The mean charged hadron multiplicity, the differential and integral jet shape distributions, and two independent moments of the shape distributions are measured as functions of the jet transverse momentum for jets reconstructed with the anti-kT algorithm. The measured observables are corrected to the particle level. In Tables 1-125, the differential jet shape $\rho(r)$ is already corrected for the unfolding correction factor, CF, listed in the table. In Tables 1-125, three sources of systematic uncertainties for $\rho(r)$ are presented separately for completeness, and DSYS is a quadratic summation of these three systematic uncertainties.
CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in... more CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in Lead-Lead collisions at a centre of mass energy per nulceon of 2.76 TeV. The elliptic anisotropy parameter, V2, defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method (EP), two- and four-particle cumulants (C2 and C4) ad Lee-Yang zeros (LYZ). V2 is presented as a function of transverse momentum PT, pseudorapidity (ETARAP) over the ranges in PT of 0-3 GeV, in |ETARAP| <2.4 and in 12 classes of centrality from 0-80%.
CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in... more CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in Lead-Lead collisions at a centre of mass energy per nulceon of 2.76 TeV. The elliptic anisotropy parameter, V2, defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method (EP), two- and four-particle cumulants (C2 and C4) ad Lee-Yang zeros (LYZ). V2 is presented as a function of transverse momentum PT, pseudorapidity (ETARAP) over the ranges in PT of 0-3 GeV, in |ETARAP| <2.4 and in 12 classes of centrality from 0-80%.
CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in... more CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in Lead-Lead collisions at a centre of mass energy per nulceon of 2.76 TeV. The elliptic anisotropy parameter, V2, defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method (EP), two- and four-particle cumulants (C2 and C4) ad Lee-Yang zeros (LYZ). V2 is presented as a function of transverse momentum PT, pseudorapidity (ETARAP) over the ranges in PT of 0-3 GeV, in |ETARAP| <2.4 and in 12 classes of centrality from 0-80%.
CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in... more CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in Lead-Lead collisions at a centre of mass energy per nulceon of 2.76 TeV. The elliptic anisotropy parameter, V2, defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method (EP), two- and four-particle cumulants (C2 and C4) ad Lee-Yang zeros (LYZ). V2 is presented as a function of transverse momentum PT, pseudorapidity (ETARAP) over the ranges in PT of 0-3 GeV, in |ETARAP| <2.4 and in 12 classes of centrality from 0-80%.
CERN-LHC. Measurement of the production cross sections for Upsilon 1S, 2S and 3S mesons in proton... more CERN-LHC. Measurement of the production cross sections for Upsilon 1S, 2S and 3S mesons in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample has an integrated luminosity of 3.1 pb-1 with an uncertainrty of 11%. Cross sections are given for the assumption of unpolarized upsilon production but the fractional change(%) of the cross section is shown in the tables where L(T) refers to fully-longitudinal(-transverse) polarization in the helicity(HX) and the Collins-Sopper(CS) frames. All cross sections are for the di-muon decay mode of the upsilon (ie not correctd for the branching ratio) and the integrated cross sections are over the specified kinematic ranges.
CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in... more CERN-LHC. Study of the anisotropy of the azimuthal distributions of charged particles produced in Lead-Lead collisions at a centre of mass energy per nulceon of 2.76 TeV. The elliptic anisotropy parameter, V2, defined as the second coefficient in a Fourier expansion of the particle invariant yields, is extracted using the event-plane method (EP), two- and four-particle cumulants (C2 and C4) ad Lee-Yang zeros (LYZ). V2 is presented as a function of transverse momentum PT, pseudorapidity (ETARAP) over the ranges in PT of 0-3 GeV, in |ETARAP| <2.4 and in 12 classes of centrality from 0-80%.
CERN-LHC. First measurement of hadronic event shapes in P P collisions at a centre-of-mass energy... more CERN-LHC. First measurement of hadronic event shapes in P P collisions at a centre-of-mass energy of 7 TeV. The data were collected between April and August 2010 and have a total integrated luminosity of 3.2 pb-1. Jet clustering uses the anti-KT algorithm with R=0.5 with a single-jet trigger requiring jet |pseudorapidity| < 5 and jet PT > 30 GeV in the low PT bin and > 50 GeV in the medium and high PT bins. Data on two event shape variables, the Central Transverse Thrust and the Central Trust Minor are presented. Numerical values were supplied by M A Weber.
CERN-LHC. Measurement of charged hadron multiplicity densities in Lead-Lead collisions, collected... more CERN-LHC. Measurement of charged hadron multiplicity densities in Lead-Lead collisions, collected with a minimum-bias trigger, at a centre-of-mass energy of 2.76 TeV per nucleon pair. Data are presented as functions of the centrality class, the charged hadron pseudorapidity and the number of participating nucleons, determined from a Glauber MC simulation.
CERN-LHC. Measurement of the total inclusive and differential cross sections in transverse moment... more CERN-LHC. Measurement of the total inclusive and differential cross sections in transverse momentum and pseudorapidity for B hadron -> muon X production in proton-proton collisions at a centre of mass energy of 7 TeV. The data sample used has an integrated luminosity of 85 nb-1 with the results covering the muon transverse momentum range > 6 GeV and |pseudorapidity| < 2.1.
CERN-LHC. Measurement of the spectra of strange hadrons (KS, LAMBDA,XI- and their antiparticles) ... more CERN-LHC. Measurement of the spectra of strange hadrons (KS, LAMBDA,XI- and their antiparticles) produced in proton-proton collisions at centre-of-mass energies of 0.9 and 7 TeV. The data, presented as functions of transverse momentum and rapidity, are from data samples of integrated luminosity 240mub-1 (0.9 TeV) and 480 mub-1 (7 TeV) collected during the spring of 2010. Numerical values supplied by K.Stenson.
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Papers by Paolo Bellan