1,211 research outputs found
A Silvio D’Arzo. Cento lettere inedite e anche più, a cura di Maurizio Festanti, Firenze, Passigli, 2024, pp. 318
No full textRecensione a "A Silvio D’Arzo. Cento lettere inedite e anche più", a cura di Maurizio Festanti, Firenze, Passigli, 2024, pp. 318
Measurement of the D0 meson production in Pb-Pb and p-Pb collisions with the ALICE experiment at the LHC
No full textThis thesis presents the measurement of the charmed D0 meson production relative to the reaction plane in Pb–Pb collisions at the centre-of-mass energy per nucleon–nucleon collision of sqrt(sNN) = 2.76 TeV, and the measurement of the D0 production in p–Pb collisions at sqrt(sNN) = 5.02 TeV with the ALICE detector at the CERN Large Hadron Collider.
The D0 azimuthal anisotropy with respect to the reaction plane is sensitive to the interaction of the charm quarks with the high-density strongly-interacting medium formed in ultra-relativistic heavy-ion collisions and, thus, to the properties of this state of matter. In particular, this observable allows to establish whether low-momentum charm quarks participate in the collective expansion of the system and whether they can reach thermal equilibrium with the medium constituents. The azimuthal anisotropy is quantified in terms of the second coefficient v2 in a Fourier expansion of the D0 azimuthal distribution and in terms of the nuclear modification factor RAA, measured in the direction of the reaction plane and orthogonal to it. The measurement of the D0 production in p–Pb collisions is crucial to disentangle the effects induced by cold nuclear matter from the final state effects induced by the hot medium formed in Pb–Pb collisions.
The D0 production is measured in both systems by reconstructing the two-prong hadronic decay D0 → K−π+ in the central rapidity region, exploiting the separation of the decay vertex from the primary vertex. The raw signal is obtained with an invariant mass analysis, and corrected for selection and reconstruction efficiency.
A positive elliptic flow v2 is observed in Pb–Pb collisions in the centrality class 30–50%, with a mean value of 0.204 + 0.099 - 0.036 in the interval 2 < pT < 6 GeV/c, which decreases towards more central collisions. Consequently, the nuclear modification factor shows a stronger suppression in the direction orthogonal to the reaction plane. The v2 and the RAA measured in two azimuthal regions with respect to the reaction plane are compared to theoretical calculations of charm quark transport and energy loss in high-density strongly-interacting matter. The models that include substantial elastic interactions with an expanding medium provide a good description of the observed anisotropy.
The D0 nuclear modification factor RpPb in p–Pb collisions is compatible with unity within uncertainties. The measured RpPb is compared to theoretical models including initial state effects, as well as to the nuclear modification factor measured in central Pb–Pb collisions. The D0 RpPb results are consistent with the modification of the nucleon parton distribution functions induced by the nuclear environment, and provide experimental evidence that the modification of the D meson momentum spectrum observed in Pb–Pb with respect to pp collisions is due to strong final state effects induced by the hot medium
Measurement of D meson azimuthal anisotropy in Pb-Pb collisions at TeV with ALICE
No full textThe azimuthal anisotropy of prompt D0, D+ and D∗+ mesons has been measured with the ALICE detector in Pb-Pb semi-central collisions at the energy √sNN = 2.76TeV. The anisotropy is quantified in terms of the second Fourier coefficient v2 and of the nuclear modification factor RAA as a function of the estimated reaction plane direction. v2 is found to be significantly larger than zero and RAA indicates a stronger suppression in the direction orthogonal to the reaction plane compared to the parallel direction
Heavy-flavour production measurements in heavy-ion collisions with ALICE at the LHC
No full textThe measurement of heavy-flavour production in ultra-relativistic heavy-ion collisions provides insights into the properties of the Quark-Gluon Plasma (QGP), the state of strongly-interacting matter characterised by high temperature and energy density where quarks and gluons are deconfined. ALICE results on heavy-flavour production in p–Pb and Pb–Pb collisions are presented
Catalogue des reliures
No full textNell'ambito dei programmi di valorizzazione del proprio ricco patrimonio, la Biblioteca Panizzi ha portato a compimento un importante progetto di censimento delle legature di pregio conservate nei fondi antichi della Sezione di Conservazione e Storia Locale. Il catalogo on line delle oltre 600 legature sarà presentato mercoledì 16 marzo alle ore 9,30 presso la Sala del Planisfero della Biblioteca Panizzi dai curatori Maurizio Festanti e Federico Macchi. Dal 16 marzo al 30 aprile una selezione..
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MISAME
No full text"Frastagliate onde" is a composition based on an italian translation of an anonymous greek fragment (about III Sec. b.C.) :
Frastagliate onde
spettri festanti
adornano il suono
dei fragili spiriti
The Italian translation of this text is very interesting for his particular speech sounds; so all the piece has been developed starting from the analysis of the text recitation, and processing in several modes the phonetic content of each word. Every sound has been realized using only the base text
Catalogue des reliures
No full textNell'ambito dei programmi di valorizzazione del proprio ricco patrimonio, la Biblioteca Panizzi ha portato a compimento un importante progetto di censimento delle legature di pregio conservate nei fondi antichi della Sezione di Conservazione e Storia Locale. Il catalogo on line delle oltre 600 legature sarà presentato mercoledì 16 marzo alle ore 9,30 presso la Sala del Planisfero della Biblioteca Panizzi dai curatori Maurizio Festanti e Federico Macchi. Dal 16 marzo al 30 aprile una selezione..
Misura dell'anisotropia del flusso delle particelle cariche in collisioni piombo-piombo ad LHC con ALICE
No full textThe goal of this thesis is to estimate anisotropic flow coefficient v2 using data from ALICE experiment of LHC. It has been estimated counting
in plane and out of plane tracks, doing the mean of cosines and fitting with a Fourier function. The event plane of each event has been found
using Qvectors method. Resolution of the detector has been
estimated too, using V0 sub-detector as well as dividing track sample in two sub-samples. Before computing v2, there was the need to introduce
different filters to get only useful events as well as useful tracks, different kinds of selections has been implemented, like the number of clusters
and the vertex position for each event, as well as pseudorapidity and the number of bunches for each track.
v2 has been presented with its dependence from the transverse momentum, and it was estimated for different centralities, even if the most important
was for centrality 30-50. Results confirm ALICE official ones, even if there was a problem with resolution using V0 detector.ope
Recent books. Italy
No full textBrevi segnalazioni di 23 titoli: Gli antichi sillabari della Biblioteca Panizzi. Catalogo, a cura di Maurizio Festanti, Reggio Emilia, Biblioteca Panizzi, 2018 (p. 515); Giuseppe Finocchiaro, Antonio Gallonio scrittore di santi. Agiografia nella Roma di Clemente VIII, Firenze, Olschki, 2019 (p. 515); Monica Alba, Artusi e gli editori fiorentini. La scienza in cucina e l’arte della stampa, Florence, Olschki, 2021 (pp. 515-516); Maurizio Festanti, Bibliotheca symbolica. I libri di emblemi e di imprese della Biblioteca Panizzi sec. XVI-XVII, Reggio Emilia, Biblioteca Panizzi, 2021 (p. 516); Daniele Danesi-Ilenia Maschietto, Catalogo del fondo Cesare Grassetti della Fondazione Giorgio Cini, Firenze, Olschki, 2020 (pp. 516-517); Diego D’Elia, Il codice Vicenza, Biblioteca Civica Bertoliana, ms. 1475. ‘Catalogo di tutte le edizioni di autori che hanno trattato sopra il Giuoco degli Scacchi’. Edizione critica e commento di una bibliografia manoscritta inedita sul gioco degli scacchi, e analisi del patrimonio librario scacchistico custodito presso la Biblioteca Civica Bertoliana di Vicenza, Bassano del Grappa, Attilio Fraccaro editore, 2020 (p. 517); Andrea De Pasquale, Che cos’è la bibliologia? Rome, Carocci editore, 2018 (p. 517); Rita De Tata, Il commercio librario a Bologna tra XV e XVI secolo, Milan, Franco Angeli, 2021 (p. 517); Laura Melosi, D’Annunzio e l’edizione 1911 della Commedia, Firenze, Olschki, 2019 (pp. 517-518); Dizionario dei tipografi e degli editori italiani. Il Cinquecento. Vol. II. G, a cura di Marco Menato, Trieste, Libreria Antiquaria Drogheria 28, 2020 (p. 518); L’editoria popolare in Italia tra XVI e XVII secolo. Testi, collezioni, mestieri. Atti delle giornate di studio, Università degli Studi Roma Tre-Fondazione Marco Besso, Roma, 13-14 dicembre 2017, a cura di Gabriele Bucchi, Paola Cosentino, Giuseppe Crimi, Manziana, Vecchiarelli editore, 2019 (p. 519); Imago librorum. Mille anni di forme del libro in Europa. Atti del convegno di Rovereto-Trento, 24-26 maggio 2017, a cura di Edoardo Barbieri, Firenze, Olschki. 2021 (p. 519); Paola Errani-Marco Palma, Incunaboli a Cesena, Roma, Viella, 2020 (pp. 519-520); Gli incunaboli della Biblioteca Oratoriana dei Girolamini. Un primo catalogo, a cura di Giancarlo Petrella, Romea, Salerno editrice. 2019 (p. 520); Federica Formiga, L’invenzione perfetta. Storia del libro, Bari-Roma, editori Laterza, 2021 (pp. 519-520); Gabriele Turi, Libri e lettori nell’Italia repubblicana, Roma, Carocci editore, 2018 (p. 521); Laura Alidori Battaglia, Il libro d’ore in Italia tra confraternite e corti, 1275-1349. Lettori, artisti, immagini, Firenze, Olschki, 2020 (pp. 521-522); Giancarlo Petrella, «Ne’ miei dolci studi m’acqueto». La collezione di storia della scienza Carlo Viganò, Florence, Olschki, 2020 (p. 522); Francesco Lumachi, Nella repubblica del libro. Bibliomani celebri, librai d’altri tempi, spigolature e curiosità bibliografiche, a cura di Antonio Castronuovo, Bologna, Pendragon, 2019 (p. 522); Mauro Chiabrando-Alberto Ravaglioli, Quella strana pubblicità. L’album dei “santini” e altre pubblicità editoriali di Leo Longanesi, Macerata, Biblohaus, 2017 (p. 522); La raccolta Monducci di libri rari e di pregio. Catalogo, a cura di Maurizio Festanti, Reggio Emilia, Comune di Reggio Emilia, Biblioteca Panizzi-Fondazione Manodori, 2020 (p. 522); Giorgio Montecchi, Storie di biblioteche, di libri e di lettori, Milan, Franco Angeli, 2018 (p. 523); Giorgio Palmieri, Tipografia e editoria nell’Italia meridionale. Gli studi sull’Abruzzo (1992-2014), Macerata, Biblohaus, 2016 (p. 523)
First Observation of an Attractive Interaction between a Proton and a Cascade Baryon
No full textThis Letter presents the first experimental observation of the attractive strong interaction between a
proton and a multistrange baryon (hyperon) Ξ−. The result is extracted from two-particle correlations of
− ̄ þ pffiffiffiffiffiffiffi
⊕ p ̄ -Ξ pairs measured in p-Pb collisions at sNN 1⁄4 5.02 TeV at the LHC with ALICE.
combined p-Ξ
The measured correlation function is compared with the prediction obtained assuming only an attractive Coulomb interaction and a standard deviation in the range [3.6, 5.3] is found. Since the measured p-Ξ− ⊕ p ̄-Ξ ̄þ correlation is significantly enhanced with respect to the Coulomb prediction, the presence of an additional, strong, attractive interaction is evident. The data are compatible with recent lattice calculations by the HAL-QCD Collaboration, with a standard deviation in the range [1.8, 3.7]. The lattice potential predicts a shallow repulsive Ξ− interaction within pure neutron matter and this implies stiffer equations of state for neutron-rich matter including hyperons. Implications of the strong interaction for the modeling of neutron stars are discussed
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