Roberto Preghenella
Istituto Nazionale di Fisica Nucleare, INFN-BO, Faculty Member
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ABSTRACT
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The production of π +, π −, K+, K−, p, and $\overline{\mathrm{p}}$ at mid-rapidity has been measured in proton-proton collisions at $\sqrt{s} = 900~\mathrm{GeV}$ with the ALICE detector. Particle identification is performed using the... more
The production of π +, π −, K+, K−, p, and $\overline{\mathrm{p}}$ at mid-rapidity has been measured in proton-proton collisions at $\sqrt{s} = 900~\mathrm{GeV}$ with the ALICE detector. Particle identification is performed using the specific energy loss in the inner tracking silicon detector and the time projection chamber. In addition, time-of-flight information is used to identify hadrons at higher momenta. Finally, the distinctive kink topology of the weak decay of charged kaons is used for an alternative measurement of the kaon transverse momentum (p t) spectra. Since these various particle identification tools give the best separation capabilities over different momentum ranges, the results are combined to extract spectra from p t=100 MeV/c to 2.5 GeV/c. The measured spectra are further compared with QCD-inspired models which yield a poor description. The total yields and the mean p t are compared with previous measurements, and the trends as a function of collision energy are discussed.
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Research Interests: Management, Engineering, Bioinformatics, Program Evaluation, Organic Chemistry, and 105 moreEducation, Health Promotion, European integration, Pain, Spatial Memory, Electron Backscatter Diffraction (EBSD), Political Science, Catalysis, Photochemistry, Photosynthesis, Social Capital, Magnetic Resonance Imaging, Symbiosis, Quality of life, Life Style, Life Sciences, Virology, Interaction, Self Care, Titanium, X ray absorption spectroscopy, High Energy Physics, Transmission Electron Microscopy, Horizontal Gene Transfer, Adolescent, Multidisciplinary, Veterinary, Cannabinoids, Theriogenology, Italy, Social Science & Medicine, Self Efficacy, Drosophila, Brain Mapping, Seasonality, Brain, Humans, Child, Models, Biomedical Research, Circular Dichroism, Strontium, Virus, Aggression, Cues, Questionnaire, Chlorophyll Fluorescence, United States, Female, Animals, Male, Insects, Reaction Time, Care, Young Adult, Exercise, Transfer, Lead Exposure, Quantum Efficiency, Validity, Magnetic Susceptibility, Hazardous Materials, Nitrogen, Dairy Cow, Wolbachia, Task analysis, Risk factors, Patient Admission, Awareness, Stimuli, Capsid, Milk products, Clinical Sciences, Chesapeake Bay, Middle Aged, Molecular cloning, Longitudinal Studies, Magnetics, Oxygen, Adult, X ray diffraction, Multiple regression analysis, Comparative European Politics, Nematoda, Pectinidae, Perceptual, Learning Motivation, Psychotic Disorders, Risk Factors, Environmental Toxicology and Chemistry, Cross sectional Study, Two Dimensions, Cross Sectional Studies, Quaternaire, Carbohydrate, Capsid Protein, Oxidation-Reduction, Pregnancy Rate, DNA marker, Biochemistry and cell biology, Cohort Studies, Estrous cycle, Marijuana abuse, Molecular Sequence Data, and DNA mutational analysis
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The pseudorapidity density and multiplicity distribution of charged particles produced in proton–proton collisions at the LHC, at a centre-of-mass energy $\sqrt{s}=7$ TeV, were measured in the central pseudorapidity region |η|<1.... more
The pseudorapidity density and multiplicity distribution of charged particles produced in proton–proton collisions at the LHC, at a centre-of-mass energy $\sqrt{s}=7$ TeV, were measured in the central pseudorapidity region |η|<1. Comparisons are made with previous measurements at $\sqrt{s}=0.9$ TeV and 2.36 TeV. At $\sqrt{s}=7$ TeV, for events with at least one charged particle in |η|<1, we obtain $\mathrm{d}N_{\mathrm{ch}}/\mathrm{d}\eta=6.01\pm0.01(\mathrm {stat.})^{+0.20}_{-0.12}(\mathrm{syst.})$ . This corresponds to an increase of $57.6\%\pm0.4\%(\mathrm{stat.})^{+3.6}_{-1.8}\%(\mathrm{syst.})$ relative to collisions at 0.9 TeV, significantly higher than calculations from commonly used models. The multiplicity distribution at 7 TeV is described fairly well by the negative binomial distribution.
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... Cotallo, Manuel Enrique; Crescio, Elisabetta; Crochet, Philippe; Cruz Alaniz, Emilia; Cuautle ... Marian; Pocheptsov, Timur; Pochybova, Sona; Podesta Lerma, Pedro Luis Manuel; Poghosyan ... Puchagin, Sergey; Puddu, Giovanna; Pujol... more
... Cotallo, Manuel Enrique; Crescio, Elisabetta; Crochet, Philippe; Cruz Alaniz, Emilia; Cuautle ... Marian; Pocheptsov, Timur; Pochybova, Sona; Podesta Lerma, Pedro Luis Manuel; Poghosyan ... Puchagin, Sergey; Puddu, Giovanna; Pujol Teixido, Jordi; Pulvirenti, Alberto; Punin, Valery ...
Since the beginning of commissioning of the ALICE-TOF detector, one of the most crucial aspects has been to check the quality of the data produced. Both during last November tests at the CERN PS and in the cosmic-ray test facility,... more
Since the beginning of commissioning of the ALICE-TOF detector, one of the most crucial aspects has been to check the quality of the data produced. Both during last November tests at the CERN PS and in the cosmic-ray test facility, running since more than one year, the data taking of assembled TOF&amp;quot; modules&amp;quot; has been continuously monitored in order to detect as quickly as possible faulty conditions or bad detector configurations. The tools developed for these purposes, which are currently also used for the commissioning of TOF&amp;quot; ...
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ABSTRACT The measurement of identified charged-hadron production at mid-rapidity ($|y| &lt; 0.5$) performed with the ALICE experiment at the LHC is presented for pp collisions at $\sqrt{s}$ = 900 GeV and 7 TeV and for Pb--Pb... more
ABSTRACT The measurement of identified charged-hadron production at mid-rapidity ($|y| &lt; 0.5$) performed with the ALICE experiment at the LHC is presented for pp collisions at $\sqrt{s}$ = 900 GeV and 7 TeV and for Pb--Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. Transverse momentum spectra of $\pi^{\pm}$, K$^{\pm}$, p, $\rm \bar{p}$ and multi-strange baryons are measured over a wide momentum range using the $dE/dx$, the time-of-flight and topological particle-identification techniques. In this report, the particle-identification detectors and techniques, as well as the achieved performance, are shortly reviewed. Proton-proton results on particle production yields, spectral shapes and particle ratios are presented as a function of the collision energy and compared to previous experiments and commonly-used Monte Carlo models. Particle spectra, yields and ratios in Pb--Pb are measured as a function of the collision centrality and the results are compared with published RHIC data in Au--Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and predictions for the LHC.
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Charged-particle production was studied in proton-proton collisions collected at the LHC with the ALICE detector at centre-of-mass energies 0.9 TeV and 2.36 TeV in the pseudorapidity range |eta| < 1.4. In the central region (|eta| < 0.5),... more
Charged-particle production was studied in proton-proton collisions collected at the LHC with the ALICE detector at centre-of-mass energies 0.9 TeV and 2.36 TeV in the pseudorapidity range |eta| < 1.4. In the central region (|eta| < 0.5), at 0.9 TeV, we measure charged-particle pseudorapidity density dNch/deta = 3.02 +- 0.01 (stat.) +0.08 -0.05 (syst.) for inelastic interactions, and dNch/deta = 3.58 +- 0.01 (stat.) +0.12 -0.12 (syst.) for non-single-diffractive interactions. At 2.36 TeV, we find dNch/deta = 3.77 +- 0.01 (stat.) +0.25 -0.12 (syst.) for inelastic, and dNch/deta = 4.43 +- 0.01 (stat.) +0.17 -0.12 (syst.) for non-single-diffractive collisions. The relative increase in charged-particle multiplicity from the lower to higher energy is 24.7% +- 0.5% (stat.) +5.7% -2.8% (syst.) for inelastic and 23.7% +- 0.5% (stat.) +4.6% -1.1% (syst.) for non-single-diffractive interactions. This increase is consistent with that reported by the CMS collaboration for non-single-diffractive events and larger than that found by a number of commonly used models. The multiplicity distribution was measured in different pseudorapidity intervals and studied in terms of KNO variables at both energies. The results are compared to proton-antiproton data and to model predictions.
Abstract: The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at sqrt {s}= 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L_int= 5.6 nb-1. The... more
Abstract: The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at sqrt {s}= 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L_int= 5.6 nb-1. The fraction of J/psi from the decay of long-lived beauty hadrons was determined for J/psi candidates with transverse momentum p_t> 1.3 GeV/c and rapidity| y|< 0.9. The cross section for prompt J/psi mesons, ie directly produced J/psi and prompt decays of heavier charmonium states such as the Psi (2S) and Csi_c ...
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Abstract: The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at sqrt {s}= 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L_int= 5.6 nb-1. The... more
Abstract: The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at sqrt {s}= 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L_int= 5.6 nb-1. The fraction of J/psi from the decay of long-lived beauty hadrons was determined for J/psi candidates with transverse momentum p_t> 1.3 GeV/c and rapidity| y|< 0.9. The cross section for prompt J/psi mesons, ie directly produced J/psi and prompt decays of heavier charmonium states such as the Psi (2S) and Csi_c ...
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... Awes,31 J. Äysto,32 M. Danish Azmi,11 S. Bablock,18 A. Badalà,33 SK Badyal,34 J. Baechler,9 S. Bagnasco,15 R. Bailhache,19 R. Bala,34 A ... 21 P. Stolpovsky,55 P. Strme n,64 JS Stutzmann,4 G. Su,62 T. Sugitate,92 M. umbera,5 C.... more
... Awes,31 J. Äysto,32 M. Danish Azmi,11 S. Bablock,18 A. Badalà,33 SK Badyal,34 J. Baechler,9 S. Bagnasco,15 R. Bailhache,19 R. Bala,34 A ... 21 P. Stolpovsky,55 P. Strme n,64 JS Stutzmann,4 G. Su,62 T. Sugitate,92 M. umbera,5 C. Suire,51 T. Susa,24 K. Sushil Kumar,112 ...