Publications by authors named "Battilana C"

Article Synopsis
  • - The mass of the top quark is determined using data from candidate events featuring at least six jets, collected by the CMS detector during proton-proton collisions at [Formula: see text] TeV in 2011, totaling an integrated luminosity of 3.54 [Formula: see text].
  • - Each event undergoes a kinematic fit of the jets to a [Formula: see text] hypothesis to accurately reconstruct the mass.
  • - The final measurement for the top-quark mass is reported as [Formula: see text] GeV, which is further refined by combining it with earlier measurements from different decay modes by CMS, resulting in a combined mass of [Formula: see text] GeV.
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Article Synopsis
  • The CMS experiment conducted a search for heavy right-handed neutrinos and right-handed [Formula: see text] bosons, which are part of theoretical extensions of the standard model of particle physics.
  • This search utilized data from proton-proton collisions at 8[Formula: see text] with an integrated luminosity of 19.7 [Formula: see text], focusing on two lepton plus two jet events.
  • The findings showed that the excluded mass region for these particles at a 95% confidence level is significantly larger than previous studies, especially in the range of neutrino masses below the [Formula: see text] boson mass.
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  • * A data-driven isolation template method was employed to accurately determine the prompt diphoton yield, specifically focusing on photons with transverse energies above certain thresholds.
  • * The results, including cross sections as a function of various parameters, are compared against theoretical predictions from quantum chromodynamics (QCD) at different order levels to assess their alignment with experimental data.
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  • - The study reports on the diphoton decay mode of the Higgs boson, utilizing data from the CMS experiment gathered during the 2011 and 2012 LHC proton-proton collisions, with a total integrated luminosity of 24.8 fb⁻¹.
  • - A significant signal for the Higgs boson is detected at a mass close to 125 GeV, aligning with standard model predictions, and the mass is precisely measured along with its signal strength.
  • - The research also includes measurements of signal strength variations linked to various production methods and performs hypothesis testing to differentiate between spin-0 and spin-2 models of particle physics.
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A search for anomalous production of events with three or more isolated leptons and bottom-quark jets produced in pp collisions at √s=8 TeV is presented. The analysis is based on a data sample corresponding to an integrated luminosity of 19.5 fb(-1) collected by the CMS experiment at the LHC in 2012.

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Article Synopsis
  • - The study examines unusual production of top quark-antiquark pairs from proton-proton collisions at a high energy level (√s=8 TeV), utilizing data from the CMS detector at the LHC.
  • - A total of 19.7 fb(-1) of data was analyzed, and the results show that the observed mass spectrum aligns with predictions made by the standard model of particle physics.
  • - For the first time, limitations on production cross sections and branching fractions are set, exploring specific new physics models that have not been addressed by previous precise measurements.
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An inclusive search is presented for new heavy particle pairs produced in √s=7 TeV proton-proton collisions at the LHC using 4.7±0.1 fb(-1) of integrated luminosity.

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Article Synopsis
  • The study reports the first measurements of vector-boson production associated with a top quark-antiquark pair during proton-proton collisions at a center-of-mass energy of 7 TeV, using data from the CMS detector at the LHC from 2011.
  • Two analysis channels were employed: a trilepton analysis for ttZ events and a same-sign dilepton analysis for ttV events (where V can be W or Z).
  • The measured cross sections are σ(ttZ) = 0.28 pb and σ(ttV) = 0.43 pb, both significant at over 3 standard deviations, and they align with theoretical predictions within the stated uncertainties.
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A search for the pair production of a heavy, narrow resonance decaying into two jets has been performed using events collected in sqrt[s] = 7 TeV pp collisions with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 5.0 fb(-1).

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A study is presented of the mass and spin-parity of the new boson recently observed at the LHC at a mass near 125 GeV. An integrated luminosity of 17.3 fb(-1), collected by the CMS experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV, is used.

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The polarizations of the Υ(1S), Υ(2S), and Υ(3S) mesons are measured in proton-proton collisions at sqrt[s] = 7 TeV, using a data sample of Υ(nS) → μ +μ- decays collected by the CMS experiment, corresponding to an integrated luminosity of 4.9 fb(-1). The dimuon decay angular distributions are analyzed in three different polarization frames.

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Results are presented from a search for the pair production of third-generation scalar and vector leptoquarks, as well as for top squarks in R-parity-violating supersymmetric models. In either scenario, the new, heavy particle decays into a τ lepton and a b quark. The search is based on a data sample of pp collisions at sqrt[s] = 7 TeV, which is collected by the CMS detector at the LHC and corresponds to an integrated luminosity of 4.

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Evidence is presented for the associated production of a single top quark and W boson in pp collisions at sqrt[s]=7  TeV with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 4.9  fb(-1).

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Results are presented from a search for heavy, right-handed muon neutrinos, N(μ), and right-handed W(R) bosons, which arise in the left-right symmetric extensions of the standard model. The analysis is based on a 5.0  fb(-1) sample of proton-proton collisions at a center-of-mass energy of 7 TeV, collected by the CMS detector at the Large Hadron Collider.

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We report an investigation of the invariant mass spectrum of the two jets with highest transverse momentum in pp → W+2-jet and W+3-jet events to look for resonant enhancement. The data sample corresponds to an integrated luminosity of 5.0 fb(-1) collected with the CMS detector at sqrt[s] = 7 TeV.

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The suppression of the individual Υ(nS) states in PbPb collisions with respect to their yields in pp data has been measured. The PbPb and pp data sets used in the analysis correspond to integrated luminosities of 150 μb(-1) and 230 nb(-1), respectively, collected in 2011 by the CMS experiment at the LHC, at a center-of-mass energy per nucleon pair of 2.76 TeV.

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First measurements of the azimuthal anisotropy of neutral pions produced in Pb-Pb collisions at a center-of-mass energy of sqrt[s(NN)] = 2.76 TeV are presented. The amplitudes of the second Fourier component (v(2)) of the π(0) azimuthal distributions are extracted using an event-plane technique.

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Article Synopsis
  • A search for supersymmetric processes in proton-proton collisions at 8 TeV was conducted using 11.7 fb of data collected by the CMS experiment at the LHC.
  • The study focused on distinguishing events with real versus mismeasured missing transverse energy by analyzing jet counts, their energy sum, and identifying bottom quark jets.
  • Results showed no significant excess of events compared to standard model predictions, leading to exclusion limits for gluino and squark masses, with gluino masses up to 1125 GeV and squark masses up to 600 GeV being ruled out, depending on the specific models considered.
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A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for [Formula: see text] events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb collected by the CMS experiment in pp collisions at [Formula: see text]. The analysis is based on endpoint determinations in kinematic distributions.

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A search for physics beyond the standard model is performed with events having one or more hadronically decaying leptons, highly energetic jets, and large transverse momentum imbalance. The data sample corresponds to an integrated luminosity of 4.98 fb of proton-proton collisions at [Formula: see text] collected with the CMS detector at the LHC in 2011.

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A search for a standard-model-like Higgs boson in the H→WW and H→ZZ decay channels is reported, for Higgs boson masses in the range 145<<1000 GeV. The search is based upon proton-proton collision data samples corresponding to an integrated luminosity of up to 5.1 fb at [Formula: see text] and up to 5.

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Unlabelled: Results are reported from a search for new physics processes in events containing a single isolated high-transverse-momentum lepton (electron or muon), energetic jets, and large missing transverse momentum. The analysis is based on a 4.98 fb sample of proton-proton collisions at a center-of-mass energy of 7 TeV, obtained with the CMS detector at the LHC.

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A measurement of the inclusive WW+WZ diboson production cross section in proton-proton collisions is reported, based on events containing a leptonically decaying W boson and exactly two jets. The data sample, collected at [Formula: see text] with the CMS detector at the LHC, corresponds to an integrated luminosity of 5.0 fb.

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Article Synopsis
  • The study investigates how multi-particle production in proton-proton collisions changes with the number of charged particles produced, focusing on jets and the underlying event.
  • Charged particles are measured based on specific momentum and spatial criteria, and jets are created from these particles while being analyzed alongside data from event generators like Pythia and Herwig.
  • Results show that existing models struggle to accurately predict the observed behavior in the data, particularly at high multiplicities, indicating a need for improved tuning or new elements in theoretical frameworks.
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A search for physics beyond the standard model is performed in events with at least three jets and large missing transverse momentum produced in proton-proton collisions at a center-of-mass energy of √s=7 TeV. No significant excess of events above the expected backgrounds is observed in 4.98 fb(-1) of data collected with the CMS detector at the Large Hadron Collider.

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