M. Menichelli

Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, Senior Researcher

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Nicole Herbots

Arizona State University

Waltraud M. Kriven

University of Illinois at Urbana-Champaign

Yavor Shopov

Sofia University "St. Kliment Ohridski"

Mohammad Mehdi Firoozabadi

The University of Birjand

Armando Marques-Guedes

UNL - New University of Lisbon

wan ahmad tajuddin wan abdullah

University of Malaya, Malaysia

Oscar Melo

Universidad Nacional de Colombia (National University of Colombia)

Masoud Najafi

Kermanshah University Of Medical Science

suhairul hashim

Universiti Teknologi Malaysia - UTM

Yoshinari Abe

Tokyo Denki University

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Papers by M. Menichelli

Wide dynamic range acquisition system for innovative radiation detectors

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010

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Radial excitations of heavy-light mesons from QCD sum rules

European Physical Journal C, 2014

QCD sum rules are commonly used to predict the characteristics of ground-state hadrons. We demons... more QCD sum rules are commonly used to predict the characteristics of ground-state hadrons. We demonstrate that two-point sum rules for the decay constants of charmed (D (*) , D (*) s) and bottom (B (*) , B (*) s) mesons can also be modified to estimate the decay constants of the first radial excitations, D (*) , D (*) s and B (*) , B (*) s , respectively, provided the masses of these resonances are used as an input. For the radially excited charmed mesons we use available experimental data, whereas the masses of analogous bottom mesons are estimated from the heavy-quark limit. The decay constants predicted for the radial excitations of heavy-light pseudoscalar and vector mesons are systematically smaller than those of the ground states and we comment on the possible origin of this difference. Our results can be used in the sum rule calculations of heavy-to-light form factors and in the factorization approximations for nonleptonic B-meson decays where the decay constants of charmed mesons enter as input parameters.

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Momentum spectra of atmospheric pions, muons, electrons and positrons at balloon altitudes

Journal of Physics G-nuclear and Particle Physics, 1997

Momentum spectra of pions, muons, electrons and secondary positrons have been measured at an atmo... more Momentum spectra of pions, muons, electrons and secondary positrons have been measured at an atmospheric depth of with the same instrument. Data was collected by the Matter Antimatter Space Spectrometer of the New Mexico State University in a balloon flight in September 1991 at the rigidity cut-off of in Fort Sumner, New Mexico. The first measurement of the positive muon

Helium in near Earth orbit

Physics Letters B, 2000

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The internal alignment and position resolution of the AMS-02 silicon tracker determined with cosmic-ray muons

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010

The Alpha Magnetic Spectrometer is a large acceptance cosmic-ray detector ð0:5 m 2 srÞ designed t... more The Alpha Magnetic Spectrometer is a large acceptance cosmic-ray detector ð0:5 m 2 srÞ designed to operate at an altitude of 400 km on the International Space Station. The AMS-02 silicon tracker contains 2264 silicon microstrip sensors (total active area 6:75 m 2). The internal alignment parameters of the assembled tracker have been determined on the ground with cosmic-ray muons. The alignment procedure is described and results for the alignment precision and position resolution are reported.

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Negative pion and muon fluxes in atmospheric cascades at a depth of 5 g

Journal of Physics G: Nuclear and Particle Physics, 1996

The Power Supply System of the AMS-02 Tracker Detector

IEEE Transactions on Nuclear Science, 2006

This paper describes the architecture, the performance and the qualification tests of the Tracker... more This paper describes the architecture, the performance and the qualification tests of the Tracker detector power supply system for the AMS-02 experiment. The AMS-02 experiment will measure the cosmic ray spectrum from 0.5 GeV up to several TeV in space, looking for anti-matter, dark matter and strange quark matter. The experimental apparatus will be installed in the International Space Station (ISS) in year 2008. A preliminary version of this experiment has flown in 1998 on the STS-91 shuttle flight. The power supply system of the tracker has been designed optimizing noise performances, modularity and efficiency. Power is generated starting from a 28V line coming from the power distribution box for the entire experiment. This power is converted into the needed voltages by means of DC-DC converters, and for bias supply and front-end voltages is postregulated by means of linear regulators. Components Off The Shelf (COTS) have been extensively used in the construction of this power supply, however various radiation test campaigns have been performed in order to verify the reliability of these components. Active components were tested for total dose radiation damage and digital components were also tested for single event effects. The power supply architecture developed for the tracker detector has been used as a guideline for the development of the power supplies for the other detectors in the experiment.

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A Measurement of the Proton and Helium Components in the Atmosphere

We report on the measurements of the proton and helium components in the atmosphere from the data... more We report on the measurements of the proton and helium components in the atmosphere from the data collected by the MASS apparatus during the ascent of the balloon-borne experiment of 1991. The detector configuration was such that proton identification was possible both below 1 GeV/ and in a higher momentum range, 5-15 GeV/. The helium component was studied above the vertical geomagnetic cutoff rigidity of 4.5 GV. We point out the different dependences on atmospheric depth for low energy secondary protons with respect to primary particles. In addition, we have measured sigificantly different attenuation lengths for protons and helium nuclei, consistently with the expectations.

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Shape, transverse size, and charged-hadron multiplicity of jets in pp collisions at √s = 7 TeV

Journal of High Energy Physics, 2012

Measurements of jet characteristics from inclusive jet production in protonproton collisions at a... more Measurements of jet characteristics from inclusive jet production in protonproton 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 pb −1. 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-k T algorithm. The measured observables are corrected to the particle level and compared with predictions from various QCD Monte Carlo generators.

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Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at=2.76 TeV

Journal of High Energy Physics, 2014

Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √ s... more Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √ s N N = 2.76 TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 µb −1. The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from v 2 to v 6 , are extracted as a function of particle transverse momentum. At higher transverse momentum, the v 2 harmonic becomes significantly smaller than the higher-order v n (n ≥ 3). The p T-averaged v 2 and v 3 are found to be equal within 2%, while higher-order v n decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. A comparison of the factorization data to hydrodynamic predictions with event-by-event fluctuating initial conditions is also presented.

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$Research paper thumbnail of Erratum: Search for anomalous $ t\overline{t} $ production in the highly-boosted all-hadronic final state$

Erratum: Search for anomalous $ t\overline{t} $ production in the highly-boosted all-hadronic final state

Journal of High Energy Physics, 2014

A search is presented for a massive particle, generically referred to as a Z , decaying into a tt... more A search is presented for a massive particle, generically referred to as a Z , decaying into a tt pair. The search focuses on Z resonances that are sufficiently massive to produce highly Lorentz-boosted top quarks, which yield collimated decay products that are partially or fully merged into single jets. The analysis uses new methods to analyze jet substructure, providing suppression of the non-top multijet backgrounds. The analysis is based on a data sample of proton-proton collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 5 fb −1. Upper limits in the range of 1 pb are set on the product of the production cross section and branching fraction for a topcolor Z modeled for several widths, as well as for a Randall-Sundrum Kaluza-Klein gluon. In addition, the results constrain any enhancement in tt production beyond expectations of the standard model for tt invariant mass larger than 1 TeV/c 2 .

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Measurement of Higgs boson production and properties in the WW decay channel with leptonic final states

Journal of High Energy Physics, 2014

A search for the standard model Higgs boson decaying to a W-boson pair at the LHC is reported. Th... more A search for the standard model Higgs boson decaying to a W-boson pair at the LHC is reported. The event sample corresponds to an integrated luminosity of 4.9 fb−1 and 19.4 fb−1 collected with the CMS detector in pp collisions at $ \sqrt{s} $ = 7 and 8 TeV, respectively. The Higgs boson candidates are selected in events with two or three charged leptons. An excess of events above background is observed, consistent with the expectation from the standard model Higgs boson with a mass of around 125 GeV. The probability to observe an excess equal or larger than the one seen, under the background-only hypothesis, corresponds to a significance of 4.3 standard deviations for m H = 125.6 GeV. The observed signal cross section times the branching fraction to WW for m H = 125.6 GeV is $ 0.72_{-0.18}^{+0.20 } $ times the standard model expectation. The spin-parity J P = 0+ hypothesis is favored against a narrow resonance with J P = 2+ or J P = 0− that decays to a W-boson pair. This result prov...

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$Research paper thumbnail of Measurement of the $ \Lambda_{\mathrm{b}}^0 $ lifetime in pp collisions at $ \sqrt{s}=7 $ TeV$

Measurement of the $ \Lambda_{\mathrm{b}}^0 $ lifetime in pp collisions at $ \sqrt{s}=7 $ TeV

Journal of High Energy Physics, 2013

A measurement of the $ \Lambda_{\mathrm{b}}^0 $ lifetime using the decay $ {{{\Lambda_{\mathrm{b}... more

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$Research paper thumbnail of Measurement of the hadronic activity in events with a Z and two jets and extraction of the cross section for the electroweak production of a Z with two jets in pp collisions at $ \sqrt{s}=7 $ TeV$

Measurement of the hadronic activity in events with a Z and two jets and extraction of the cross section for the electroweak production of a Z with two jets in pp collisions at $ \sqrt{s}=7 $ TeV

Journal of High Energy Physics, 2013

The first measurement of the electroweak production cross section of a Z boson with two jets (Zjj... more The first measurement of the electroweak production cross section of a Z boson with two jets (Zjj) in pp collisions at $ \sqrt{s}=7 $ TeV is presented, based on a data sample recorded by the CMS experiment at the LHC with an integrated luminosity of 5 fb−1. The cross section is measured for the ℓℓjj (ℓ = e, μ) final state in the kinematic region m ℓℓ > 50 GeV, m jj > 120 GeV, transverse momenta $ p_{\mathrm{T}}^{\mathrm{j}}>25 $ GeV and pseudorapidity |η j| < 4.0. The measurement, combining the muon and electron channels, yields σ = 154 ± 24 (stat.) ± 46 (exp. syst.) ± 27 (th. syst.) ± 3 (lum.) fb, in agreement with the theoretical cross section. The hadronic activity, in the rapidity interval between the jets, is also measured. These results establish an important foundation for the more general study of vector boson fusion processes, of relevance for Higgs boson searches and for measurements of electroweak gauge couplings and vector boson scattering.

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Search for supersymmetry in events with b jets and missing transverse momentum at the LHC

Journal of High Energy Physics, 2011

A search for supersymmetry is presented using a sample of events with b jets and missing transver... more A search for supersymmetry is presented using a sample of events with b jets and missing transverse momentum. The search uses a data sample of proton-proton collisions at a centre-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 35 pb −1 , collected with the CMS detector. A total of 0.33 +0.43 −0.33 (stat.) ± 0.13 (syst.) events is predicted, using control samples in the data, to arise from standard model processes, and one event is observed in the data. Upper limits are set at the 95% confidence level on the cross sections of benchmark supersymmetric models.

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Search for light resonances decaying into pairs of muons as a signal of new physics

Journal of High Energy Physics, 2011

A search for groups of collimated muons is performed using a data sample collected by the CMS exp... more A search for groups of collimated muons is performed using a data sample collected by the CMS experiment at the LHC, at a centre-of-mass energy of 7 TeV, and corresponding to an integrated luminosity of 35 pb −1. The analysis searches for production of new low-mass states decaying into pairs of muons and is designed to achieve high sensitivity to a broad range of models predicting leptonic jet signatures. With no excess observed over the background expectation, upper limits on the production cross section times branching fraction times acceptance are set, ranging from 0.1 to 0.5 pb at the 95% CL depending on event topology. In addition, the results are interpreted in several benchmark models in the context of supersymmetry with a new light dark sector exploring previously inaccessible parameter space.

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$Research paper thumbnail of Measurement of the cross section and angular correlations for associated production of a Z boson with b hadrons in pp collisions at $ \sqrt{s} $ = 7 TeV$

Measurement of the cross section and angular correlations for associated production of a Z boson with b hadrons in pp collisions at $ \sqrt{s} $ = 7 TeV

Journal of High Energy Physics, 2013

A study of proton-proton collisions in which two b hadrons are produced in association with a Z b... more A study of proton-proton collisions in which two b hadrons are produced in association with a Z boson is reported. The collisions were recorded at a centre-of-mass energy of 7 TeVwith the CMS detector at the LHC, for an integrated luminosity of 5.2 fb−1. The b hadrons are identified by means of displaced secondary vertices, without the use of reconstructed jets, permitting the study of b-hadron pair production at small angular separation. Differential cross sections are presented as a function of the angular separation of the b hadrons and the Z boson. In addition, inclusive measurements are presented. For both the inclusive and differential studies, different ranges of Z boson momentum are considered, and each measurement is compared to the predictions from different event generators at leading-order and next-to-leading-order accuracy.

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$Research paper thumbnail of Suppression of non-prompt J/ψ, prompt J/ψ, and $ \Upsilon $(1S) in PbPb collisions at $ \sqrt {{{s_{\text{NN}}}}} = 2.76 $ TeV$

Suppression of non-prompt J/ψ, prompt J/ψ, and $ \Upsilon $(1S) in PbPb collisions at $ \sqrt {{{s_{\text{NN}}}}} = 2.76 $ TeV

Journal of High Energy Physics, 2012

Yields of prompt and non-prompt J/ψ, as well as $ \Upsilon $ (1S) mesons, are measured by the CMS... more

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Multiplicity and transverse momentum dependence of two- and four-particle correlations in pPb and PbPb collisions

Physics Letters B, 2013

Search for a Higgs boson decaying into a Z and a photon in pp collisions at s=7 and 8 TeV

Physics Letters B, 2013

A search for a Higgs boson decaying into a Z boson and a photon is described. The analysis is per... more A search for a Higgs boson decaying into a Z boson and a photon is described. The analysis is performed using proton-proton collision datasets recorded by the CMS detector at the LHC. Events were collected at center-of-mass energies of 7 TeV and 8 TeV, corresponding to integrated luminosities of 5.0 fb −1 and 19.6 fb −1 , respectively. The selected events are required to have opposite-sign electron or muon pairs. No excess above standard model predictions has been found in the 120-160 GeV mass range and the first limits on the Higgs boson production cross section times the H → Zγ branching fraction at the LHC have been derived. The observed limits are between about 4 and 25 times the standard model cross section times the branching fraction. The observed and expected limits for m γ at 125 GeV are within one order of magnitude of the standard model prediction. Models predicting the Higgs boson production cross section times the H → Zγ branching fraction to be larger than one order of magnitude of the standard model prediction are excluded for most of the 125-157 GeV mass range.

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Wide dynamic range acquisition system for innovative radiation detectors

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010

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Radial excitations of heavy-light mesons from QCD sum rules

European Physical Journal C, 2014

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Momentum spectra of atmospheric pions, muons, electrons and positrons at balloon altitudes

Journal of Physics G-nuclear and Particle Physics, 1997

Helium in near Earth orbit

Physics Letters B, 2000

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The internal alignment and position resolution of the AMS-02 silicon tracker determined with cosmic-ray muons

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010

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Negative pion and muon fluxes in atmospheric cascades at a depth of 5 g

Journal of Physics G: Nuclear and Particle Physics, 1996

The Power Supply System of the AMS-02 Tracker Detector

IEEE Transactions on Nuclear Science, 2006

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A Measurement of the Proton and Helium Components in the Atmosphere

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Shape, transverse size, and charged-hadron multiplicity of jets in pp collisions at √s = 7 TeV

Journal of High Energy Physics, 2012

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Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at=2.76 TeV

Journal of High Energy Physics, 2014

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$Research paper thumbnail of Erratum: Search for anomalous $ t\overline{t} $ production in the highly-boosted all-hadronic final state$

Erratum: Search for anomalous $ t\overline{t} $ production in the highly-boosted all-hadronic final state

Journal of High Energy Physics, 2014

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Measurement of Higgs boson production and properties in the WW decay channel with leptonic final states

Journal of High Energy Physics, 2014

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$Research paper thumbnail of Measurement of the $ \Lambda_{\mathrm{b}}^0 $ lifetime in pp collisions at $ \sqrt{s}=7 $ TeV$

Measurement of the $ \Lambda_{\mathrm{b}}^0 $ lifetime in pp collisions at $ \sqrt{s}=7 $ TeV

Journal of High Energy Physics, 2013

A measurement of the $ \Lambda_{\mathrm{b}}^0 $ lifetime using the decay $ {{{\Lambda_{\mathrm{b}... more

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Measurement of the hadronic activity in events with a Z and two jets and extraction of the cross section for the electroweak production of a Z with two jets in pp collisions at $ \sqrt{s}=7 $ TeV

Journal of High Energy Physics, 2013

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Search for supersymmetry in events with b jets and missing transverse momentum at the LHC

Journal of High Energy Physics, 2011

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Search for light resonances decaying into pairs of muons as a signal of new physics

Journal of High Energy Physics, 2011

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$Research paper thumbnail of Measurement of the cross section and angular correlations for associated production of a Z boson with b hadrons in pp collisions at $ \sqrt{s} $ = 7 TeV$

Measurement of the cross section and angular correlations for associated production of a Z boson with b hadrons in pp collisions at $ \sqrt{s} $ = 7 TeV

Journal of High Energy Physics, 2013

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$Research paper thumbnail of Suppression of non-prompt J/ψ, prompt J/ψ, and $ \Upsilon $(1S) in PbPb collisions at $ \sqrt {{{s_{\text{NN}}}}} = 2.76 $ TeV$

Suppression of non-prompt J/ψ, prompt J/ψ, and $ \Upsilon $(1S) in PbPb collisions at $ \sqrt {{{s_{\text{NN}}}}} = 2.76 $ TeV

Journal of High Energy Physics, 2012

Yields of prompt and non-prompt J/ψ, as well as $ \Upsilon $ (1S) mesons, are measured by the CMS... more

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Multiplicity and transverse momentum dependence of two- and four-particle correlations in pPb and PbPb collisions

Physics Letters B, 2013

Search for a Higgs boson decaying into a Z and a photon in pp collisions at s=7 and 8 TeV

Physics Letters B, 2013

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