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4. Probing the symmetry energy at high baryon density with heavy ion collisions

Author

Greco, V., Colonna, M., Di Toro, M., and Wolter, H. H.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The nuclear symmetry energy at densities above saturation density ($\rho_0\sim 0.16 fm^{-3}$) is poorly constrained theoretically and very few relevant experimental data exist. Its study is possible through Heavy Ion Collisions (HIC) at energies $E/A> 200$ MeV, particularly with beams of neutron-rich radioactive nuclei. The energy range implies that the momentum dependence of the isospin fields, i.e. the difference of the effective masses on protons and neutrons, also has to be investigated before a safe constraint on $\esy(\rho)$ is possible. We discuss the several observables which have been suggested, like $n/p$ emission and their collective flows and the ratio of meson yields with different isospin projection, $\pi^-/\pi^+$ and $K^0/K^+$. We point out several physical mechanisms that should be included in the theoretical models to allow a direct comparison to the more precise experiments which will be able to distinguish the isospin projection of the detected particles: CSR/Lanzhou, FAIR/GSI, RIBF/RIKEN, FRIB/MSU., Comment: 12 opages, 5 figures, Proceedings of IWND09 - 22-25 August 2009 Shanghai (China)

Published
2009
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5. Constraining the Symmetry Energy: A Journey in the Isospin Physics from Coulomb Barrier to Deconfinement

Author

Di Toro, M., Colonna, M., Greco, V., Ferini, G., Rizzo, C., Rizzo, J., Baran, V., Gaitanos, T., Prassa, V., Wolter, H. H., and Zielinska-Pfabe, M.

Subjects
Nuclear Theory
Abstract

Heavy Ion Collisions (HIC) represent a unique tool to probe the in-medium nuclear interaction in regions away from saturation. In this work we present a selection of reaction observables in dissipative collisions particularly sensitive to the isovector part of the interaction, i.e. to the symmetry term of the nuclear Equation of State (EoS). At low energies the behavior of the symmetry energy around saturation influences dissipation and fragment production mechanisms. We will first discuss the recently observed Dynamical Dipole Radiation, due to a collective neutron-proton oscillation during the charge equilibration in fusion and deep-inelastic collisions. Important Iso-EOS effects are stressed. Reactions induced by unstable 132Sn beams appear to be very promising tools to test the sub-saturation Isovector EoS. New Isospin sensitive observables are also presented for deep-inelastic, fragmentation collisions and Isospin equilibration measurements (Imbalance Ratios). The high density symmetry term can be derived from isospin effects on heavy ion reactions at relativistic energies (few AGeV range), that can even allow a ``direct'' study of the covariant structure of the isovector interaction in the hadron medium. Rather sensitive observables are proposed from collective flows and from pion/kaon production. The possibility of the transition to a mixed hadron-quark phase, at high baryon and isospin density, is finally suggested. Some signatures could come from an expected ``neutron trapping'' effect. The importance of studying violent collisions with radioactive beams from low to relativistic energies is finally stressed., Comment: 15 pages, 5 figures, Int.Workshop on Nuclear Dynamics in Heavy Ion Reactions and Neutron Stars, Beijing Normal Univ. July 07, to appear in Int.Journ.Modern Physics E (2008)

Published
2007
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6. Extraction of heavy-flavor transport coefficients in QCD matter

Author

Rapp, R., Gossiaux, P.B., Andronic, A., Averbeck, R., Masciocchi, S., Beraudo, A., Bratkovskaya, E., Braun-Munzinger, P., Cao, S., Dainese, A., Das, S.K., Djordjevic, M., Greco, V., He, M., van Hees, H., Inghirami, G., Kaczmarek, O., Lee, Y.-J., Liao, J., Liu, S.Y.F., Moore, G., Nahrgang, M., Pawlowski, J., Petreczky, P., Plumari, S., Prino, F., Shi, S., Song, T., Stachel, J., Vitev, I., and Wang, X.-N.

Published
2018
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9. Design optimization of ultra-fast silicon detectors

Author

Cartiglia, N., Arcidiacono, R., Baselga, M., Bellan, R., Boscardin, M., Cenna, F., Dalla Betta, G.F., Fernndez-Martnez, P., Ferrero, M., Flores, D., Galloway, Z., Greco, V., Hidalgo, S., Marchetto, F., Monaco, V., Obertino, M., Pancheri, L., Paternoster, G., Picerno, A., Pellegrini, G., Quirion, D., Ravera, F., Sacchi, R., Sadrozinski, H.F.-W., Seiden, A., Solano, A., and Spencer, N.

Published
2015
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12. Sensors for ultra-fast silicon detectors

Author

Sadrozinski, H.F.-W., Baselga, M., Ely, S., Fadeyev, V., Galloway, Z., Ngo, J., Parker, C., Schumacher, D., Seiden, A., Zatserklyaniy, A., Cartiglia, N., Pellegrini, G., Fernández-Martínez, P., Greco, V., Hidalgo, S., and Quirion, D.

Published
2014
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21. The TOTEM detector at LHC

Author

Antchev, G., Aspell, P., Atanassov, I., Avati, V., Berardi, V., Berretti, M., Bozzo, M., Brucken, E., Buzzo, A., Cafagna, F., Calicchio, M., Catanesi, M.G., Ciocci, M.A., Csanád, M., Csörgő, T., Deile, M., Dénes, E., Dimovasili, E., Doubek, M., Eggert, K., Ferro, F., Garcia, F., Giani, S., Greco, V., Grzanka, L., Heino, J., Hilden, T., Janda, M., Kaˇspar, J., Kopal, J., Kundrat, V., Kurvinen, K., Lami, S., Latino, G., Lauhakangas, R., Lippmaa, E., Lokajicek, M., Lo Vetere, M., Lucas Rodriguez, F., Macri`, M., Magazzu`, G., Minutoli, S., Niewiadomski, H., Notarnicola, G., Novak, T., Oliveri, E., Oljemark, F., Orava, R., Oriunno, M., Osterberg, K., Palazzi, P., Pedreschi, E., Petajajarvi, J., Quinto, M., Radermacher, E., Radicioni, E., Ravotti, F., Robutti, E., Ropelewski, L., Ruggiero, G., Rummel, A., Saarikko, H., Sanguinetti, G., Santroni, A., Scribano, A., Sette, G., Snoeys, W., Spearman, W., Spinella, F., Ster, A., Taylor, C., Trummal, A., Turini, N., Vacek, V., Vitek, M., Whitmore, J., and Wu, J.

Published
2010
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22. The TOTEM T2 telescope based on triple-GEM chambers

Author

Bagliesi, M.G., Berretti, M., Brucken, E., Cecchi, R., David, E., Garcia, F., Greco, V., Heino, J., Hilden, T., Kurvinen, K., Lauhakangas, R., Lami, S., Latino, G., Magazzù, G., Oliveri, E., Pedreschi, E., Ropelewski, L., Scribano, A., Spinella, F., Turini, N., and Van Stenis, M.

Published
2010
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24. The CDF level 2 calorimetric trigger upgrade

Author

Bhatti, A., Canepa, A., Casarsa, M., Convery, M., Cortiana, G., Dell’Orso, M., Donati, S., Flanagan, G., Frisch, H., Fukun, T., Krop, D., Giannetti, P., Greco, V., Jones, M., Liu, T., Lucchesi, D., Pagan-Griso, S., Pantano, D., Pianori, E., Piendibene, M., Pilcher, C., Ristori, L., Rogondino, L., Rusu, V., Sartori, L., Schmidt, M., Veszpremi, V., Vidal, M., and Zhou, L.

Published
2009
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30. Level-2 calorimeter trigger upgrade at CDF

Author

Bhatti, A., Canepa, A., Casarsa, M., Convery, M., Cortiana, G., Donati, S., Flanagan, G., Greco, V., Frisch, H., Fukun, T., Giannetti, P., Krop, D., Liu, T., Lucchesi, D., Piendibene, M., Ristori, L., Rogondino, L., Rusu, V., Sartori, L., Vidal, M., and Zhou, L.

Subjects
Calorimeters -- Design and construction, Digital integrated circuits -- Usage, Programmable logic array, Business, Electronics, Electronics and electrical industries
Abstract

The CDF Run II [1] Level 2 calorimeter trigger is implemented in hardware and is based on a simple algorithm that was used in Run I. This system has worked well for Run II at low luminosity. As the Tevatron instantaneous luminosity increases, the limitation due to this simple algorithm starts to become clear. As a result, some of the most important jet and MET (Missing ET) related triggers have large growth terms in cross section at higher luminosity. In this paper, we present an upgrade of the L2CAL system which makes the full calorimeter trigger tower information directly available to the Level 2 decision CPU. This upgrade is based on the Pulsar [2], a general purpose VME board developed at CDF and already used for upgrading both the Level 2 global decision crate [3] and the Level 2 Silicon Vertex Tracking [4]. The upgrade system allows more sophisticated algorithms to be implemented in software and both Level 2 jets and MET can be made nearly equivalent to offline quality, thus significantly improving the performance and flexibility of the jet and MET related triggers. This is a natural expansion of the already-upgraded Level 2 trigger system, and is a big step forward to improve the CDF triggering capability at Level 2. This paper describes the design, the hardware and software implementation and the performance of the upgrade system. Index Terms--Calorimeter, CDF, FPGA, HEP, trigger.

Published
2009

33. Shear viscosity of QGP and the anisotropic flows within an event by event transport approach

Author

Plumari S., Guardo G. L., Puglisi A., Scardina F., and Greco V.

Subjects
Physics, QC1-999
Abstract

We have employed a relativistic kinetic transport approach that incorporates initial state fluctuations to study the effect of a temperature dependent shear viscosity to entropy density ratio η/s(T) on the build-up of the anisotropic flows υn(pT). We find that at LHC energies and for ultra-central collisions (0 – 0.2%) the υn(pT) have a stronger sensitivity to the T dependence of η/s in the QGP phase and this sensitivity increases with the order of the harmonic n. Moreover we have studied the correlation between the initial spatial anisotropies ϵn and the final flow coefficients 〈υn〉 for different centralities and for the two beam energies. The study shows that at LHC energies there is more correlation than at RHIC energies. In particular at LHC energies and for ultra-central collisions the linear correlation coefficient C(ϵn, υn) ≈ 1 for n = 2, 3, 4 and 5 suggesting that the 〈υn〉 are strongly related to the initial value of ϵn.

Published
2016
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34. Hadronization via coalescence at RHIC and LHC

Author

Minissale V., Scardina F., and Greco V.

Subjects
Physics, QC1-999
Abstract

An hadronization model that includes coalescence and fragmentation is used in this work to obtain predictions at both RHIC and LHC energy for light and strange hadrons transverse momentum spectra (π, p, k, Λ) and baryon to meson ratios (p/π, Λ/k) in a wide range of pT. This is accomplished without changing coalescence parameters. The ratios p/π and Λ/K shows the right behaviour except for some lack of baryon yield in a limited pT range around 6 GeV. This would indicate that the AKK fragmentation functions is too flat at pT < 8 GeV.

Published
2016
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35. Shear viscosity to electric conductivity ratio of the QGP

Author

Puglisi A., Plumari S., and Greco V.

Subjects
Physics, QC1-999
Abstract

The transport coefficients of strongly interacting matter are currently subject of intense theoretical and phenomenological studies due to their relevance for the characterization of the quark-gluon plasma produced in ultra-relativistic heavy-ion collisions (uRHIC). We predict that (η/s)/(σel/T), independently on the running coupling αs(T), should increase up to about ~ 20 for T → Tc, while it goes down to a nearly flat behavior around ≃ 4 for T ≥ 4 Tc. Therefore we find a stronger T-dependence of σel/T with respect to η/s that in a quasiparticle approach is constrained by lQCD thermodynamics. A conformal theory, instead, predicts a similar T dependence of η/s and σel/T.

Published
2016
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36. The ASY-EOS Experiment at GSI

Author

Russotto P., Chartier M., Cozma M.D., De Filippo E., Le Fèvre A., Gannon S., Gašparić I., Kiš M., Kupny S., Leifels Y., Lemmon R.C., Li Q., Łukasik J., Marini P., Pawłowski P., Trautmann W., Acosta L., Adamczyk M., Al-Ajlan A., Al-Garawi M., Al-Homaidhi S., Amorini F., Auditore L., Aumann T., Ayyad Y., Baran V., Basrak Z., Bassini R., Benlliure J., Boiano C., Boisjoli M., Boretzky K., Brzychczyk J., Budzanowski A., Cardella G., Cammarata P., Chajecki Z., Chbihi A., Colonna M., Czech B., Di Toro M., Famiano M., Greco V., Grassi L., Guazzoni C., Guazzoni P., Heil M., Heilborn L., Introzzi R., Isobe T., Kezzar K., Krasznahorkay A., Kurz N., La Guidara E., Lanzalone G., Lasko P., Lombardo I., Lynch W.G., Matthews Z., May L., Minniti T., Mostazo M., Pagano A., Papa M., Pirrone S., Pleskac R., Politi G., Porto F., Reifarth R., Reisdorf W., Riccio F., Rizzo F., Rosato E., Rossi D., Santoro S., Simon H., Skwirczynska I., Sosin Z., Stuhl L., Trifirò A., Trimarchi M., Tsang M.B., Verde G., Veselsky M., Vigilante M., Wieloch A., Wigg P., Wolter H.H., Wu P., Yennello S., Zambon P., Zetta L., and Zoric M.

Subjects
Physics, QC1-999
Abstract

The elliptic-flow ratio of neutrons with respect to protons or light complex particles in reactions of heavy ions at pre-relativistic energies has been proposed as an observable sensitive to the strength of the symmetry term of the nuclear equation of state at supra-saturation densities. In the ASY-EOS experiment at the GSI laboratory, flows of neutrons and light charged particles were measured for 197Au+197Au collisions at 400 MeV/nucleon. Flow results obtained for the Au+Au system, in comparison with predictions of the UrQMD transport model, confirm the moderately soft to linear density dependence of the symmetry energy deduced from the earlier FOPI-LAND data.

Published
2016
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37. Modelling early stages of relativistic heavy-ion collisions

Author

Ruggieri M., Puglisi A., Oliva L., Plumari S., Scardina F., and Greco V.

Subjects
Physics, QC1-999
Abstract

In this study we model early time dynamics of relativistic heavy ion collisions by an initial color-electric field which then decays to a plasma by the Schwinger mechanism. The dynamics of the many particles system produced by the decay is described by relativistic kinetic theory, taking into account the backreaction on the color field by solving self-consistently the kinetic and the field equations. Our main results concern isotropization and thermalization for a 1+1D expanding geometry. In case of small η/s (η/s ≲ 0.3) we find τisotropization ≈ 0.8 fm/c and τthermalization ≈ 1 fm/c in agreement with the common lore of hydrodynamics.

Published
2016
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38. The nuclear matrix elements of 0νββ decay and the NUMEN project at INFN-LNS

Author

Cappuzzello F., Agodi C., Balestra F., Bijker R., Bonanno D., Bongiovanni D., Branchina V., Calabrese S., Calabretta L., Calanna A., Calvo D., Carbone D., Cavallaro M., Colonna M., Ferrero S., Foti A., Finocchiaro P., Giraudo G., Greco V., Iazzi F., Introzzi R., Lanzalone G., Lavagno A., Lo Presti D., Longhitano F., Muoio A., Pandola L., Rifuggiato D., Ruslan M.V., Santopinto E., Scaltrito L., Tudisco S., and Zagatto V.

Subjects
Physics, QC1-999
Abstract

An innovative technique to access the nuclear matrix elements entering the expression of the life time of the double beta decay by relevant cross sections measurements of double charge exchange reactions is proposed. A key aspect of the project is the use of the MAGNEX large acceptance magnetic spectrometer, for the detection of the ejectiles, and of the LNS K800 Superconducting Cyclotron (CS), for the acceleration of the required high resolution and low emittance heavyion beams, already in operation at INFN Laboratory Nazionali del Sud in Catania (Italy).

Published
2016
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39. Heavy quark dynamics in the QGP: Towards a solution of the RAA and ν2 puzzle

Author

Scardina F., Das S. K., Plumari S., and Greco V.

Subjects
Physics, QC1-999
Abstract

The two key observables related to heavy quarks that have been measured in experiments are the nuclear suppression factor RAA and the elliptic flow ν2. The simultaneous reproduction of these two observables is a puzzle which have challenged all the existing models. We discuss two ingredients responsible for addressing a large part of such a puzzle: the temperature dependence of the energy loss and the full solution of the Boltzmann collision integral for the scattering between the heavy quarks and the particle of the bulk.

Published
2016
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48. Conserved glycines in the C terminus of MinC proteins are implicated in their functionality as cell division inhibitors

Author

Ramirez-Arcos, S., Greco, V., Douglas, H., Tessier, D., Fan, D., Szeto, J., Wang, J., and Dillon, J.R.

Subjects
Recombinant proteins -- Research, Mutagenesis -- Research, Cell division -- Research, Glycine -- Research, Biological sciences
Abstract

Alignment of 36 MinC sequences revealed four completely conserved C-terminal glycines. As MinC inhibits cytokinesis in Neisseria gonorrhoeae and Escherichia coli, the functional importance of these glycines in N. gonorrhoeae MinC (Min[C.sub.Ng]) and E. coli MinC (Min[C.sub.Ec]) was investigated through amino acid substitution by using site-directed mutagenesis. Each mutant was evaluated for its ability to arrest cell division and to interact with itself and MinD. In contrast to overexpression of wild-type MinC, overexpression of mutant proteins in E. coli did not induce filamentation, indicating that they lost functionality. Yeast two-hybrid studies showed that Min[C.sub.Ec] interacts with itself and Min[D.sub.Ec]; however, no interactions involving Min[C.sub.Ng] were detected. Therefore, a recombinant MinC protein, with the N terminus of Min[C.sub.Ec] and the C terminus of Min[C.sub.Ng], was designed to test for a Min[C.sub.Ng]-Min[D.sub.Ng] interaction. Each MinC mutant interacted with either MinC or MinD but not both, indicating the specificity of glycine residues for particular protein-protein interactions. Each glycine was mapped on the C-terminal surfaces (A, B, and C) of the solved Thermotoga maritima MinC structure. We found that Min[C.sub.Ec] G161, residing in close proximity to the A surface, is involved in homodimerization, which is essential for MinC function. Glycines corresponding to Min[C.sub.Ec] G135, G154, and G171, located within or adjacent to the B-C surface junction, are critical for MinC-MinD interactions. Circular dichroism revealed no gross structural perturbations of the mutant proteins, although the contribution of glycines to protein flexibility and stability cannot be discounted. Using molecular modeling, we propose that exposed conserved MinC glycines interact with exposed residues of the [alpha]-7 helix of MinD.

Published
2004

49. Hard gamma as probe of nuclear dynamics

Author

Coniglione, R., Sapienza, P., Alba, R., Agodi, C., Maiolino, C., Del Zoppo, A., Colonna, M., Bellia, G., Finocchiaro, P., Greco, V., Loukachine, K., Migneco, E., Piattelli, P., Santonocito, D., Colonna, N., Bruno, M., D’Agostino, M., Vannini, G., Mastinu, P. F., Gramegna, F., Iori, I., Fabbietti, L., Moroni, A., Margagliotti, G. V., Milazzo, P. M., Rui, R., Blumenfeld, Y., and Scarpaci, J. A.

Published
2002
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50. Energetic proton emission in heavy ion collisions at intermediate energy: Pre-equilibrium and cooperative effects

Author

Sapienza, P., Coniglione, R., Colonna, M., Migneco, E., Agodi, C., Alba, R., Bellia, G., Del Zoppo, A., Finocchiaro, R., Greco, V., Loukachine, K., Maiolino, C., Piattelli, P., Santonocito, D., Ventura, P. G., Blumenfeld, Y., Bruno, M., Colonna, N., D’Agostino, M., Fabbietti, L., Fiandri, M. L., Gramegna, F., Iori, I., Margagliotti, G. V., Mastinu, P. F., Milazzo, P. M., Moroni, A., Rui, R., Scarpaci, J. A., and Vannini, G.

Published
2002
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