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Bicocca Open Archive Research Data

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  • WP5_ regulatory_actions
    This is folder for data and documents useful to draft the regulatory plan and to prepare all the actions related to WP5.
    • Dataset
  • In2Sight_WP2.Design_MicroOptic
    Data related to the design of the microoptics for in2sight, D2.1
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  • MCNNTUNES: Tuning Shower Monte Carlo generators with machine learning
    The parameters tuning of event generators is a research topic characterized by complex choices: the generator response to parameter variations is difficult to obtain on a theoretical basis, and numerical methods are hardly tractable due to the long computational times required by generators. Event generator tuning has been tackled by parametrization-based techniques, with the most successful one being a polynomial parametrization. In this work, an implementation of tuning procedures based on artificial neural networks is proposed. The implementation was tested with closure testing and experimental measurements from the ATLAS experiment at the Large Hadron Collider.
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    • Document
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  • Vbfnlo: A parton level Monte Carlo for processes with electroweak bosons
    This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018) Abstract Vbfnlo is a fully flexible parton level Monte Carlo program for the simulation of vector boson fusion, double and triple vector boson production in hadronic collisions at next-to-leading order in the strong coupling constant. Vbfnlo includes Higgs and vector boson decays with full spin correlations and all off-shell effects. In addition, Vbfnlo implements CP-even and CP-odd Higgs boson via gluon fusion, associated with two jets, at the leading-order one-loop level with the full top- a... Title of program: VBFNLO Catalogue Id: AEDO_v1_0 Nature of problem To resolve the large scale dependence inherent in leading order calculations and to quantify the cross section error induced by uncertainties in the determination of parton distribution functions, it is necessary to include NLO corrections. Moreover, whenever stringent cuts are required on decay products and/or identified jets the question arises whether the scale dependence and a k-factor, defined as the ratio of NLO to LO cross section, determined for the inclusive production cross sections ar ... Versions of this program held in the CPC repository in Mendeley Data AEDO_v1_0; VBFNLO; 10.1016/j.cpc.2009.03.006
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  • Measurement of the $\mathrm{t\bar{t}}\mathrm{b\bar{b}}$ production cross section in the all-jet final state in pp collisions at $\sqrt{s} =$ 13 TeV
    CERN-LHC. Measurement of the ttbb production cross section in the all-jet final state in proton-proton collisions at centre-of-mass energy of 13 TeV with 35.9 fb^-1 of data collected in 2016. The final state used is 8 jets. Three different phase space regions are used for the measurement The Parton independent (PI) phase space: - 8 or more jets - 4 or more bjets - leading 6 jets with ptJet > 30 GeV - ptJet > 20 GeV - |etaJet| < 2.4 The Parton based (PB) phase space: - 8 or more jets - 4 or more bjets - leading 6 jets with ptJet > 30 GeV - ptJet > 20 GeV - |etaJet| < 2.4 - 2 or more bjets not matched to a top decay object The total phase space: - 2 or more bjets not matched to a top decay object - not matched bjets ptJet > 20 GeV - not matched bjets |etaJet| < 2.4
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  • Study of central exclusive $\pi^+\pi^-$ production in proton-proton collisions at $\sqrt{s} =$ 5.02 and 13 TeV
    Central exclusive and semiexclusive production of pi+pi- pairs is measured with the CMS detector in proton-proton collisions at the LHC at center-of-mass energies of 5.02 and 13 TeV. The theoretical description of these nonperturbative processes, which have not yet been measured in detail at the LHC, poses a significant challenge to models. The two pions are measured and identified in the CMS silicon tracker based on specific energy loss, whereas the absence of other particles is ensured by calorimeter information. The total and differential cross sections of exclusive and semiexclusive central pi+pi- production are measured as functions of invariant mass, transverse momentum, and rapidity of the pi+pi- system in the fiducial region defined as transverse momentum pT(pi) > 0.2 GeV and pseudorapidity |eta(pi)| < 2.4. The production cross sections for the four resonant channels f0(500), rho0(770), f0(980), and f2(1270) are extracted using a simple model. These results represent the first measurement of this process at the LHC collision energies of 5.02 and 13 TeV.
    • Collection
  • Study of central exclusive $\pi^+\pi^-$ production in proton-proton collisions at $\sqrt{s} =$ 5.02 and 13 TeV
    Central exclusive and semiexclusive production of pi+pi- pairs is measured with the CMS detector in proton-proton collisions at the LHC at center-of-mass energies of 5.02 and 13 TeV. The theoretical description of these nonperturbative processes, which have not yet been measured in detail at the LHC, poses a significant challenge to models. The two pions are measured and identified in the CMS silicon tracker based on specific energy loss, whereas the absence of other particles is ensured by calorimeter information. The total and differential cross sections of exclusive and semiexclusive central pi+pi- production are measured as functions of invariant mass, transverse momentum, and rapidity of the pi+pi- system in the fiducial region defined as transverse momentum pT(pi) > 0.2 GeV and pseudorapidity |eta(pi)| < 2.4. The production cross sections for the four resonant channels f0(500), rho0(770), f0(980), and f2(1270) are extracted using a simple model. These results represent the first measurement of this process at the LHC collision energies of 5.02 and 13 TeV.
    • Collection
  • Observation of electroweak production of W$\gamma$ with two jets in proton-proton collisions at $\sqrt {s}$ = 13 TeV
    CERN-LHC. Measurement of the cross section for electroweak production and constraints on anomalous quartic couplings from events with a W boson and a photon in association with two jets in proton-proton collisions at sqrt(s) = 13 TeV. The W boson candidates are selected through their decay into a electron or muon and corresponding neutrino. The process of interest, electroweak W gamma jj production, is isolated by selecting events with a large dijet mass and a large pseudorapidity gap between the two jets. The measurement is based on data collected with the CMS detector in 2016 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. The observed significance of the signal is 4.9 standard deviations, where a significance of 4.6 standard deviations is expected in the standard model predictions. The results are combined with previously published CMS results based on sqrt(s)=8 TeV data, which leads to an observed (expected) significance of 5.3 (4.8) standard deviations. The measured value of the fiducial cross section for the signal is reported. Bounds are given on quartic vector boson interactions in the framework of dimension-8 effective field theory operators at 95% confidence level.
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  • Measurement of the average very forward energy as a function of the track multiplicity at central pseudorapidities in proton-proton collisions at $\sqrt{s}=13\,\text {TeV} $
    The average total energy as well as its hadronic and electromagnetic components are measured with the CMS detector at pseudorapidities −6.6
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  • Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies
    Measurements of the second Fourier harmonic coefficient ($v_2$) of the azimuthal distributions of prompt and nonprompt D$^{0}$ mesons produced in pp and pPb collisions are presented. Nonprompt D$^{0}$ mesons come from beauty hadron decays. The data samples are collected by the CMS experiment at nucleon-nucleon center-of-mass energies of 13 and 8.16 TeV, respectively. In high multiplicity pp collisions, $v_2$ signals for prompt charm hadrons are reported for the first time, and are found to be comparable to those for light-flavor hadron species over a transverse momentum ($p_{\mathrm{T}}$) range of 2-6 GeV. Compared at similar event multiplicities, the prompt D$^{0}$ meson $v_2$ values in pp and pPb collisions are similar in magnitude. The $v_2$ values for open beauty hadrons are extracted for the first time via nonprompt D$^{0}$ mesons in D$^{0}$ collisions. For $p_{\mathrm{T}}$ in the range of 2-5 GeV, the results suggest that $v_2$ for nonprompt D$^{0}$ mesons is smaller than that for prompt D$^{0}$ mesons. These new measurements indicate a positive charm hadron $v_2$ in pp collisions and suggest a mass dependence in $v_2$ between charm and beauty hadrons in the pPb system. These results provide insights into the origin of heavy-flavor quark collectivity in small systems.
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