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Toru Iijima (Nagoya University)26/09/2017, 09:00
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Christophe Royon (The University of Kansas (US))26/09/2017, 09:10
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Nicola Orlando (University of Hong Kong (HK))26/09/2017, 09:15
The modelling of Minimum Bias (MB) is a crucial ingredient to learn about the description of soft QCD processes and to simulate the environment at the LHC with many concurrent pp interactions (pile-up).
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We summarise the ATLAS minimum bias measurements with proton-proton collision at 13 TeV center-of-mass-energy at the Large Hadron Collider. -
Juan Manuel Grados Luyando (Deutsches Elektronen-Synchrotron (DE))26/09/2017, 10:00
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Christophe Royon (The University of Kansas (US))26/09/2017, 10:30
Exclusive diffraction results from CMS
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Alessio Tiberio (Universita e INFN, Firenze (IT))26/09/2017, 11:30
The LHC-forward (LHCf) experiment, situated at the LHC accelerator, has measured neutral particles production in a very forward region (pseudo-rapidity $\eta > 8.4$, including zero degree) in proton-proton and proton-lead collisions.
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The main purpose of the LHCf experiment is to test the hadronic interaction models used in ground based cosmic rays experiments to simulate cosmic rays induced... -
Qidong Zhou (Nagoya University (JP))26/09/2017, 12:10
Collider experiment is an efficient way to verify and improve the hadronic interaction models. Abundant of energy flow in the forward region of the collisions are believed to have large influence to the development of air-shower. LHCf is the experiment dedicate to verify the hadronic interaction models by measuring the forward neutral particle production at the LHC. According to the LHCf...
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Paul Richard Newman (University of Birmingham (GB))26/09/2017, 14:00
An extensive programme of diffractive studies was carried out by the H1 and ZEUS collaborations using data from the full 15 year lifetime of the HERA electron-proton collider. This talk will review the results from that programme, particularly where they relate to studies at the LHC. The main topics will be quasi-elastic vector meson photoproduction and electroproduction and soft and hard...
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Sergey Ostapchenko (Frankfurt Institute for Advanced Studies (FIAS))26/09/2017, 14:45
Using a phenomenological approach, I investigate the importance
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of higher twist corrections to parton processes in high energy
proton-proton scattering. -
Boris Kopeliovich (UTFSM)26/09/2017, 15:15
Coulomb-Nuclear Interference (CNI) mechanism of single-spin asymmetry in small-angle elastic scattering of polarized protons offers a unique way to measure the spin-flip part of the Pomeron. We analyze recent data from RHIC on single-spin asymmetry in pp and pA elastic scattering in the CNI region, aiming at determination of $r_5$, the fractional spin-flip component of the hadronic elastic...
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Roman Pasechnik (Lund University)26/09/2017, 16:15
The color dipole approach enables us to evaluate the diffractive particle production observables beyond the concept of diffractive factorisation. In this talk, I will overview the current status of research in this direction and present preliminary results on single-diffractive non-Abelian Bremsstrahlung processes with di-jets and quarkonia final states.
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Valentina Zaccolo (Universita e INFN Torino (IT))26/09/2017, 16:45
At the LHC, collision final states have been studied principally in the central kinematic region, where, generally, perturbative QCD can be used. However, there is rich soil for measurements in the forward direction, which probe the nucleon structure at small Bjorken-x values where saturation effects are expected.
A full set of saturation probes in the forward rapidity region of ALICE will be...
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Leszek Motyka26/09/2017, 17:30
The forward Drell-Yan scattering is an excellent probe of the proton structure down to very small x. In this region effects of BFKL evolution are strong. We study in detail these effects in the Drell-Yan structure functions. At small x and moderate invariant masses of the Drell-Yan pair also effects of higher twist operators and multiple scattering are expected to turn on. We model them using...
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Mitsuhiro Nakamura (Nagoya University)27/09/2017, 09:00
Nuclear emulsion is high sensitive photographic film used for detection of three-dimensional trajectory of charged particles. These trajectories are recorded as tracks consist of chain of silver particles. The size of silver particles is less than 1 micrometer, so that nuclear emulsion has sub-micron three-dimensional spatial resolution, which gives us an angular resolution of a few mrad in...
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Hiroki Rokujo (Nagoya University (JP))27/09/2017, 10:00
Nuclear emulsion records all trajectories of charged particles with sub-micron spatial resolution and specializes in detailed measurements of topologies of various particle interactions. Remarkable increase in the readout speed of the emulsion scanning system has realized data acquisition from the full volume of emulsion chambers and the minimum-biased analysis. In this talk, we report the...
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felix riehn (KIT)27/09/2017, 11:00
The observation of ultra-high energy cosmic rays by the current leading
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air shower detectors, the Pierre Auger Observatory and the Telescope
Array offer the unique possibility to study hadronic interactions at
the highest energies. From the observation of the development of air
showers in the atmosphere, for example, the experiments can determine
the interaction cross section of protons at... -
Lu Lu (Chiba University)27/09/2017, 11:45
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Tanguy Pierog (KIT)27/09/2017, 14:00
The interpretation of EAS measurements strongly depends on detailed air shower
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simulations. CORSIKA is one of the most commonly used air shower Monte Carlo
program. The main source of uncertainty in the prediction of shower observable for different primary particles and energies being currently dominated by differences between hadronic interaction models even after the update taking into... -
Dr Morihiro Honda27/09/2017, 14:30
The hadronic interaction model at 1--10 GeV for the calculation of atmospheric neutrino is studied with the atmospheric muon data in 1 GeV -- 1 TeV for vertical directions and in 100 GeV -- 10 TeV for horizontal directions. Some preliminary result on the calculation of atmospheric neutrino flux are also shown.
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Takashi Sako (Nagoya University (JP))27/09/2017, 15:00
RHICf is an experiment to measure neutral particles emitted around the zero degree in the 510GeV proton-proton collisions at RHIC. The detector was installed in the interaction point of STAR and physics operation was carried out from 25 to 27 June, 2017. Introduction to the experiment and the first results are presented in the workshop. Forward particle cross sections are useful to...
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Boris Kopeliovich (UTFSM), Christophe Royon (The University of Kansas (US))27/09/2017, 15:30
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Tanguy Pierog (KIT)27/09/2017, 17:00
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Ralf Seidl (RIKEN)28/09/2017, 09:00
The PHENIX experiment at the relativistic heavy ion collider RHIC has been taking data related to the study of the quark-gluon plasma and the spin structure of the nucleon. For the spin structure measurements we have shown that the gluon spin contribution to the total spin of the nucleon is substantial at intermediate x and several ongoing measurements at forward rapidities access even lower...
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Carl Gagliardi (Texas A&M University)28/09/2017, 09:45
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Boris Kopeliovich (UTFSM)28/09/2017, 11:00
Absorptive corrections, known to suppress proton-neutron transitions with large fractional momentum z→1 in pp collisions, become dramatically strong on a nuclear target, and push the partial cross sections of leading neutron production to the very periphery of the nucleus. The mechanism of π-a1 interference, which successfully explains the observed single-spin asymmetry in polarized pp→nX, is...
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Mr Junsang Park (Seoul National University/RIKEN)28/09/2017, 11:30
Since single spin asymmetry(AN) was measured, AN has been useful physical observable value in searching intrinsic structure of nucleon and interactions among nucleons. In case of forward region, One Pion Exchange model and Reggeon exchange model have shown good consensus with AN from inclusive neutron measurement via PHENIX Zero Degree Calorimetry(ZDC) at RHIC. One of goals in RHICf experiment...
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Tune Kamae28/09/2017, 12:00
Evidence for GeV Cosmic Rays from White Dwarfs in the Local Cosmic Ray Spectra and in the Gamma-ray Emissivity of the Inner Galaxy
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Abhay Deshpande (Stony Brook University)28/09/2017, 14:00
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Gaku Mitsuka28/09/2017, 14:45
I will present the transverse single spin asymmetries for very forward neutrons in polarized p-A ultra-peripheral collisions. These asymmetries are about 35 % and the cross section of p-Au ultra-peripheral collisions is comparable with that of hadronic interactions. Thus such asymmetries are central to the AN for very forward neutrons measured by the PHENIX zero-degree calorimeters (ZDCs) in...
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Yoshitaka Hatta (Japan/Yukawa Institute)28/09/2017, 15:15
We propose to constrain the gluon Wigner distribution in the nucleon by studying the exclusive diffractive dijet production process in ultraperipheral proton-nucleus collisions (UPCs) at RHIC and the LHC. Compared to the previous proposal to study the same observable in lepton-nucleon scattering, the use of UPCs has a few advantages: not only the cross section is larger, but also the...
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Hirotsugu Fujii (University of Tokyo)28/09/2017, 16:15
We review and update our current understanding of quarkonium and heavy-meson production at forward rapidities in the CGC framework.
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Prof. Krzysztof Kutak (IFJ PAN)28/09/2017, 16:45
I am going to report on study the production of forward di-jets in proton-lead and proton-proton collisions at the Large Hadron Collider. Such configurations, with both jets produced in the forward direction, impose a dilute-dense asymmetry which allows to probe the gluon density of the lead or proton target at small longitudinal momentum fractions. Even though the jet momenta are always much...
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Dr Yasushi Nara (Akita international university)28/09/2017, 17:15
We report a current status of a new Monte-Carlo event generator for high energy
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nuclear collisions based on the Pythia8 event generator:nPythia.
Nuclear collisions are modeled by the successive nucleon-nucleon
(NN) collisions based on the Glauber type model.
For each NN collision, we use Pythia8, but taking account
of conservation laws for a whole system.
It is found that incoherent sum of NN... -
Toma Suzuki (University of Tsukuba (JP))28/09/2017, 17:45
$\ $In high-energy heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) and at the Large Hadron Collider (LHC) strongly interacting matter is produced in which quarks and gluons are deconfined. The ALICE experiment studies the properties of this so-called Quark-Gluon Plasma at the LHC. However, there are still many unanswered questions with regards to the initial state of these...
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Maciej Trzebinski (Polish Academy of Sciences (PL))29/09/2017, 09:00
GenEx - a new Monte Carlo tool for exclusive light meson production
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will be presented. This tool is being developed by our group and is
complementary to the existing MC generators. The generator is
self-adapting to the provided matrix element and acceptance cuts. The
modular structure of the code, designed for easy process
implementation, will be shown. As an example, the exclusive... -
Christophe Royon (The University of Kansas (US))29/09/2017, 09:30
Forward Physics with tagged protons at the LHC: from the Pomeron structure to the search for quartic anomalous couplings
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Mr Jordan Scharnhorst29/09/2017, 10:00
With the usage of proton tagging at the LHC arises the possibility of detecting broad resonances. Without proton tagging, it is difficult to find broad resonances within the statistical and systematic uncertainties on the invariant mass due to the high SM backgrounds. We seek to establish bounds on the widths of broad resonances produced exclusively by diphoton exchanges with and without...
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Fabio Ravera (Universita e INFN Torino (IT))29/09/2017, 11:00
The CMS-TOTEM Precision Proton Spectrometer allows the extension of the LHC physics program by detecting scattered protons in the very forward region of CMS. The detector includes tracking and timing stations installed along the beam pipe at $\sim 210$ m from the CMS interaction point on both sides. The tracking detector is presently constituted by one silicon strip and one silicon 3D pixel...
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Carla Sbarra (Universita e INFN, Bologna (IT))29/09/2017, 11:45
The installation of the second arm of the Atlas Forward Proton (AFP) detector system has been completed in time for the 2017 running of LHC, opening the road for measurements of processes with two forward protons. This talk will describe the status of the project, its rich physics programme, as well as first perfomance and measurements with beams. Further ATLAS results with just one or without...
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Renaud Boussarie (IFJ Krakow)29/09/2017, 13:45
We present the calculation of the impact factor for the γ(∗)→qq¯¯γ(∗)→qq¯ transition with one loop accuracy in arbitrary kinematics. The calculation was done within Balitsky’s high energy operator expansion. Together with our previous result for the γ(∗)→qq¯¯gγ(∗)→qq¯g Born impact factor it allows one to derive cross sections for 2- (one loop) and 3-jet (Born) difractive electroproduction. We...
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Takeshi Osada29/09/2017, 14:15
We propose a novel phenomenological model of mean transverse momentum fluctuations based on the Geometrical Scaling hypothesis. Bose-Einstein correlations between two gluons generated from an identical color flux tube are taken into account as a source of the fluctuation. We calculate an event-by-event fluctuation measure and show that ALICE data observed 0.90 TeV for p+p collisions are...
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Leszek Motyka29/09/2017, 14:45
The DIS data from HERA are analyzed in a framework of the leading twist contributions described by the standard DGLAP formalism (NLO and NNLO) complemented by twist 4 corrections inspired by the saturation model. We fit the data down to $Q^2=1$ GeV$^2$ and find an evidence for the higher twist effects at small $x$ and moderate $Q^2$. We also study parton saturation effects in the input for the...
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Yoshitaka Ito (Nagoya University (JP))29/09/2017, 15:15
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Toma Suzuki (University of Tsukuba (JP))
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Dr Morihiro Honda
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Tune Kamae
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Mr Jordan Scharnhorst
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Christophe Royon (The University of Kansas (US))
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Qidong Zhou (S)
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Grzegorz Brona (University of Warsaw (PL))
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Takeshi Osada
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