The Experts below are selected from a list of 332613 Experts worldwide ranked by ideXlab platform
I Abt - One of the best experts on this subject based on the ideXlab platform.
-
improved measurement of the b bbar production cross section in 920 gev fixed target proton nucleus collisions
Physical Review D, 2005Co-Authors: I AbtAbstract:A new measurement of the b-bbar production cross section in 920 GeV proton-nucleus collisions is presented by the HERA-B collaboration. The b-bbar production is tagged via inclusive bottom quark decays into J/psi mesons, by exploiting the longitudinal separation of J/psi->ll decay vertices from the primary proton-nucleus Interaction Point. Both e+e- and mu+mu- channels are reconstructed, for a total of 83 +- 12 inclusive b->J/psi X events found. The combined analysis yields a b-bbar to prompt J/psi cross section ratio of ${\frac{{\Delta\sigma(bbbar)}}{{\Delta\sigma_{\jpsi}}}} = 0.032\pm 0.005 \stat \pm 0.004 \sys$ measured in the x_f acceptance (-0.35
-
improved measurement of the b anti b production cross section in 920 gev fixed target proton nucleus collisions
Physical Review D, 2005Co-Authors: I Abt, I Belotelov, U Werthenbach, I Matchikhilian, A Bertin, V Pugatch, B Giacobbe, D Peralta, U Schwanke, D WegenerAbstract:A new measurement of the b-bbar production cross section in 920 GeV proton-nucleus collisions is presented by the HERA-B collaboration. The b-bbar production is tagged via inclusive bottom quark decays into J/psi mesons, by exploiting the longitudinal separation of J/psi->ll decay vertices from the primary proton-nucleus Interaction Point. Both e+e- and mu+mu- channels are reconstructed, for a total of 83 +- 12 inclusive b->J/psi X events found. The combined analysis yields a b-bbar to prompt J/psi cross section ratio of ${\frac{{\Delta\sigma(bbbar)}}{{\Delta\sigma_{\jpsi}}}} = 0.032\pm 0.005 \stat \pm 0.004 \sys$ measured in the x_f acceptance (-0.35
Christopher A Hunter - One of the best experts on this subject based on the ideXlab platform.
-
a surface site Interaction Point method for dissipative particle dynamics parametrization application to alkyl ethoxylate surfactant self assembly
Journal of Physical Chemistry B, 2020Co-Authors: Ennio Lavagnini, Joanne L Cook, Patrick B Warren, Mark J Williamson, Christopher A HunterAbstract:Dissipative particle dynamics (DPD) is a coarse-grained approach to the simulation of large supramolecular systems, but one limitation has been that the parameters required to describe the noncovalent Interactions between beads are not readily accessible. A first-principles computational method has been developed so that bead Interaction parameters can be calculated directly from ab initio gas-phase molecular electrostatic potential surfaces of the molecular fragments that represent the beads. A footprinting algorithm converts the molecular electrostatic potential surfaces into a discrete set of surface site Interaction Points (SSIPs), and these SSIPs are used in the SSIMPLE (surface site Interaction model for the properties of liquids at equilibrium) algorithm to calculate the free energies of transfer of one bead into a solution of any other bead. The bead transfer free energies are then converted into the required DPD Interaction parameters for all pairwise combinations of different beads. The reliability of the parameters was demonstrated using DPD simulations of a range of alkyl ethoxylate surfactants. The simulations reproduce the experimentally determined values of the critical micelle concentration and mean aggregation number well for all 22 surfactants studied.
-
a surface site Interaction Point methodology for macromolecules and huge molecular databases
Journal of Computational Chemistry, 2017Co-Authors: Antoni Oliver, Christopher A Hunter, Rafel Prohens, Josep L RosselloAbstract:Determining the position and magnitude of Surface Site Interaction Points (SSIP) is a useful technique for understanding intermolecular Interactions. SSIPs have been used for the prediction of solvation properties and for virtual co-crystal screening. To determine the SSIPs for a molecule, the Molecular Electrostatic Potential Surface (MEPS) is first calculated using ab initio methods such as Density Functional Theory. This leads to a high cost in terms of computation time and is not compatible with the analysis of huge molecular databases. Herein, we present a method for the fast estimation of SSIPs, which is based on the MEPS calculated from MMFF94 atomic partial charges. The results show that this method can be used to calculate SSIPs for large molecular databases with a much higher speed than the original ab initio methodology. © 2017 Wiley Periodicals, Inc.
M Berretti - One of the best experts on this subject based on the ideXlab platform.
-
measurement of the forward charged particle pseudorapidity density in pp collisions at s 8 tev using a displaced Interaction Point
European Physical Journal C, 2015Co-Authors: G Antchev, P Aspell, I Atanassov, V Avati, J Baechler, V Berardi, M Berretti, E BossiniAbstract:The pseudorapidity density of charged particles dN $$_{ ch }$$ /d $$\eta $$ is measured by the TOTEM experiment in proton–proton collisions at $$\sqrt{s} = 8$$ TeV within the range $$3.9<\eta <4.7$$ and $$-6.95<\eta <-6.9$$ . Data were collected in a low intensity LHC run with collisions occurring at a distance of 11.25 m from the nominal Interaction Point. The data sample is expected to include 96–97 % of the inelastic proton–proton Interactions. The measurement reported here considers charged particles with $$p_T>0$$ MeV/c, produced in inelastic Interactions with at least one charged particle in $$-7<\eta <-6$$ or $$3.7<\eta <4.8$$ . The dN $$_{ ch }$$ /d $$\eta $$ has been found to decrease with $$|\eta |$$ , from 5.11 $$\pm $$ 0.73 at $$\eta =3.95$$ to 1.81 $$\pm $$ 0.56 at $$\eta =-$$ 6.925. Several Monte Carlo generators are compared to the data and are found to be within the systematic uncertainty of the measurement.
-
measurement of the forward charged particle pseudorapidity density in pp collisions at sqrt s 8 tev using a displaced Interaction Point
European Physical Journal C, 2015Co-Authors: G Antchev, P Aspell, I Atanassov, V Avati, J Baechler, V Berardi, M Berretti, E BossiniAbstract:The pseudorapidity density of charged particles dN\(_{ ch }\)/d\(\eta \) is measured by the TOTEM experiment in proton–proton collisions at \(\sqrt{s} = 8\) TeV within the range \(3.9 0\) MeV/c, produced in inelastic Interactions with at least one charged particle in \(-7<\eta <-6\) or \(3.7<\eta <4.8\). The dN\(_{ ch }\)/d\(\eta \) has been found to decrease with \(|\eta |\), from 5.11 \(\pm \) 0.73 at \(\eta =3.95\) to 1.81 \(\pm \) 0.56 at \(\eta =-\)6.925. Several Monte Carlo generators are compared to the data and are found to be within the systematic uncertainty of the measurement.
-
the totem experiment at the cern large hadron collider
Journal of Instrumentation, 2008Co-Authors: G Anelli, G Antchev, P Aspell, V Avati, V Berardi, M Berretti, M G Bagliesi, V Boccone, U BottigliAbstract:The TOTEM Experiment will measure the total pp cross-section with the luminosity-independent method and study elastic and diffractive scattering at the LHC. To achieve optimum forward coverage for charged particles emitted by the pp collisions in the Interaction Point IP5, two tracking telescopes, T1 and T2, will be installed on each side in the pseudorapidity region 3.1 ≤ |η| ≤ 6.5, and Roman Pot stations will be placed at distances of ±147 m and ±220 m from IP5. Being an independent experiment but technically integrated into CMS, TOTEM will first operate in standalone mode to pursue its own physics programme and at a later stage together with CMS for a common physics programme. This article gives a description of the TOTEM apparatus and its performance.
E Bossini - One of the best experts on this subject based on the ideXlab platform.
-
measurement of the forward charged particle pseudorapidity density in pp collisions at s 8 tev using a displaced Interaction Point
European Physical Journal C, 2015Co-Authors: G Antchev, P Aspell, I Atanassov, V Avati, J Baechler, V Berardi, M Berretti, E BossiniAbstract:The pseudorapidity density of charged particles dN $$_{ ch }$$ /d $$\eta $$ is measured by the TOTEM experiment in proton–proton collisions at $$\sqrt{s} = 8$$ TeV within the range $$3.9<\eta <4.7$$ and $$-6.95<\eta <-6.9$$ . Data were collected in a low intensity LHC run with collisions occurring at a distance of 11.25 m from the nominal Interaction Point. The data sample is expected to include 96–97 % of the inelastic proton–proton Interactions. The measurement reported here considers charged particles with $$p_T>0$$ MeV/c, produced in inelastic Interactions with at least one charged particle in $$-7<\eta <-6$$ or $$3.7<\eta <4.8$$ . The dN $$_{ ch }$$ /d $$\eta $$ has been found to decrease with $$|\eta |$$ , from 5.11 $$\pm $$ 0.73 at $$\eta =3.95$$ to 1.81 $$\pm $$ 0.56 at $$\eta =-$$ 6.925. Several Monte Carlo generators are compared to the data and are found to be within the systematic uncertainty of the measurement.
-
measurement of the forward charged particle pseudorapidity density in pp collisions at sqrt s 8 tev using a displaced Interaction Point
European Physical Journal C, 2015Co-Authors: G Antchev, P Aspell, I Atanassov, V Avati, J Baechler, V Berardi, M Berretti, E BossiniAbstract:The pseudorapidity density of charged particles dN\(_{ ch }\)/d\(\eta \) is measured by the TOTEM experiment in proton–proton collisions at \(\sqrt{s} = 8\) TeV within the range \(3.9 0\) MeV/c, produced in inelastic Interactions with at least one charged particle in \(-7<\eta <-6\) or \(3.7<\eta <4.8\). The dN\(_{ ch }\)/d\(\eta \) has been found to decrease with \(|\eta |\), from 5.11 \(\pm \) 0.73 at \(\eta =3.95\) to 1.81 \(\pm \) 0.56 at \(\eta =-\)6.925. Several Monte Carlo generators are compared to the data and are found to be within the systematic uncertainty of the measurement.
D Wegener - One of the best experts on this subject based on the ideXlab platform.
-
improved measurement of the b anti b production cross section in 920 gev fixed target proton nucleus collisions
Physical Review D, 2005Co-Authors: I Abt, I Belotelov, U Werthenbach, I Matchikhilian, A Bertin, V Pugatch, B Giacobbe, D Peralta, U Schwanke, D WegenerAbstract:A new measurement of the b-bbar production cross section in 920 GeV proton-nucleus collisions is presented by the HERA-B collaboration. The b-bbar production is tagged via inclusive bottom quark decays into J/psi mesons, by exploiting the longitudinal separation of J/psi->ll decay vertices from the primary proton-nucleus Interaction Point. Both e+e- and mu+mu- channels are reconstructed, for a total of 83 +- 12 inclusive b->J/psi X events found. The combined analysis yields a b-bbar to prompt J/psi cross section ratio of ${\frac{{\Delta\sigma(bbbar)}}{{\Delta\sigma_{\jpsi}}}} = 0.032\pm 0.005 \stat \pm 0.004 \sys$ measured in the x_f acceptance (-0.35