DIS09
→
Europe/Zurich
Palacio de Congresos de Madrid
Palacio de Congresos de Madrid
Paseo de la Castellana, 99
28046 Madrid
España
Juan Terron
Description
XVII International Workshop on Deep-Inelastic Scattering and Related Subjects
DIS 2009 is the 17th in the series of annual workshops on Deep-Inelastic Scattering (DIS) and Related Subjects. The aim of these workshops is to review the progress in the field of DIS and Quantum Chromodynamics (QCD) and to lay the groundwork for future experiments. Most recent results from HERA, JLab, RHIC, Tevatron and fixed-target experiments as well as the status of the LHC experiments and the relevant theoretical developments will be covered in plenary and parallel sessions. DIS 2009 will be held from the 26th to the 30th of April 2009 at the "Palacio de Congresos" in downtown Madrid and will be organised by the High-Energy Physics group of the Universidad Autonoma de Madrid.
http://www.ft.uam.es/DIS2009/
Support
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Plenary Session: Chair: Halina Abramowicz (Tel Aviv University) Auditorium
Auditorium
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 1
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10:45
Coffee Break Palacio de Congresos
Palacio de Congresos
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España -
Plenary Session: Chair: Jos Vermaseren (Nikhef) Auditorium
Auditorium
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 5
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13:20
Lunch
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Plenary Session: Chair: Max Klein (University of Liverpool) Auditorium
Auditorium
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 9
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16:30
Coffee Break Auditorium
Auditorium
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España -
Plenary Session: Chair: Steven Vigdor (Brookhaven National Laboratory) Auditorium
Auditorium
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 12
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Reception Palacio de Congresos
Palacio de Congresos
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España
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Diffraction and Vector Mesons: Session-1 Room "SALA 2-A"
Room "SALA 2-A"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 16
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Discussion on data combination
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Electroweak Physics and Beyond the Standard Model: Session-1 Room "SALA 7"
Room "SALA 7"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 21
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Heavy Flavours: Session-1 Room "SALA 2-B"
Room "SALA 2-B"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España-
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IntroductionSpeakers: Ahmed Ali (DESY), Diego Tonelli (Fermilab), Leonid Gladilin (Moscow State University)
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Inclusive photoproduction of D* mesons at next-to-leading order in the General-Mass Variable-Flavor-Number SchemeI discuss the inclusive production of D* mesons in photon-proton collisions at DESY HERA, based on a calculation at next-to-leading order in the general-mass variable-flavor-number scheme. In this approach, MSbar subtraction is applied in such a way that large logarithmic corrections are resummed in universal parton distribution and fragmentation functions and finite mass terms are taken into account. I present detailed numerical results for a comparison with data obtained at HERA and discuss various sources of theoretical uncertainties.Speaker: Hubert Spiesberger (Mainz)
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Beauty photoproduction at ZEUSPhotoproduction of b quarks in dijet events has been measured with the ZEUS detector at HERA. The large mass of the beauty quark and its long lifetime were exploited in order to separate the beauty signal from background, making use of the microvertex detector to determine the distance of the beauty decay products from the primary event vertex. Differential cross sections were measured and compared to next-to-leading order QCD predictions.Speaker: Silvia Miglioranzi (CERN)
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Beauty photoproduction through decays to muons and jets (H1)The photoproduction of beauty quarks in ep collisions has been measured using a data sample of 170 pb-1 collected with the H1 detector at HERA-II in the years 2006 and 2007. Beauty photoproduction events are investigated with two jets and a muon in the final state. Visible cross sections are measured differentially in the transverse momenta of the highest energy jet and the muon, in the pseudorapidity of the muon and in the photon's momentum fraction x_gamma^obs entering the hard interaction. The measurements are found to be well described by QCD calculations at NLO.Speaker: Benno List (University of Hamburg)
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MC@NLO for heavy quarks at HERAIn this talk the recently completed version of MC@NLO for heavy quarks in photoproduction will be presented. In MC@NLO the matrix element is calculated to NLO in the coupling, and then supplemented by parton showers resummed to all orders. To avoid double counting, the NLO calculation has to be matched to the parton shower. Comparisons with H1 and Zeus data will be shown.Speaker: Tobias Toll (DESY)
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Hadronic Final States and QCD: Session-1 Room "SALA 8"
Room "SALA 8"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 31
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Structure Functions and Low-x: Session-1 Room "SALA GOYA"
Room "SALA GOYA"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 36
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Spin Physics: Session-1 Room "SALA 9"
Room "SALA 9"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 40
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10:45
Coffee Break Palacio de Congresos
Palacio de Congresos
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España -
Diffraction and Vector Mesons: Session-2 Room "SALA 2-A"
Room "SALA 2-A"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 44
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Electroweak Physics and Beyond the Standard Model: Session-2 Room "SALA 7"
Room "SALA 7"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 49
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Heavy Flavours: Session-2 Room "SALA 2-B"
Room "SALA 2-B"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España-
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Theoretical status of J/psi production at HERAIn this talk, I review the photo-production of J/psi states at HERA. In the framework of NRQCD, I present the various components expected to contribute to the J/psi yield at HERA, and their importance in different regions of the phase space. I compare the predicted differential cross sections with the data collected by the ZEUS and H1 collaborations. I then move on the polarization observables and present the brand-new color-singlet prediction at NLO accuracy in alpha_s, in view of the recent measurement performed by the ZEUS collaboration. Based on these results, I argue that the sole color-singlet yield fails to explain the J/psi distributions measured at HERA.Speaker: Pierre Artoisenet (Univerite catholique de Louvain)
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Measurement of J/psi helicity distributions in inelastic photoproduction at ZEUSThe decay angular distributions for inelastic photoproduction of J/psi mesons have been measured with the ZEUS detector at HERA, using an integrated luminosity of 468 pb-1. J/psi mesons were identified using their decays into muons. The polar and azimuthal distributions of the mu+ in the J/psi rest frame have been measured as a function of pT and as function of z, where pT is the transverse momentum of the J/psi in the laboratory frame and z is the the fraction of the incident photon energy carried by the J/psi in the proton rest frame. The experimental results were compared to the theoretical predictions at leading and next-to-leading order.Speaker: Alessandro Bertolin (Padova)
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Production and polarization of Upsilon mesons in the k_T-factorization approachIn the framework of the k_T-factorization approach, the production and polarization of the Upsilon mesons at the Tevatron is considered and a comparison of the calculated double differential distributions and the spin alignment parameter alpha with the D0 experimental data is shown. We argue that measuring the double differential cross section and the polarization of the upsilonium states can serve as crucial tests for discriminating two competing theoretical approaches to the parton dynamics in QCD.Speaker: Nikolay ZOTOV (SINP, Moscow State University)
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J/psi polarization from fixed-target to collider energiesThe determination of the magnitude and "sign" of the J/psi polarization crucially depends on the reference frame used in the analysis of the data and a full understanding of the polarization phenomenon requires measurements reported in two "orthogonal" frames, such as the Collins-Soper and helicity frames. Moreover, the azimuthal anisotropy can be, in certain frames, as significant as the polar one. The seemingly contradictory J/psi polarization results reported by E866, HERA-B and CDF can be consistently described assuming that the most suitable axis for the measurement is along the direction of the relative motion of the colliding partons, and that directly produced J/psi's are longitudinally polarized at low momentum and transversely polarized at high momentum. We make specific predictions that can be tested on existing CDF data and by LHC measurements, which should show a full transverse polarization for direct J/psi mesons of pT > 25 GeV/c.Speaker: Pietro Faccioli (Dipartimento di Fisica - Universita degli Studi di Bologna)
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Hadronic Final States and QCD: Session-2 Room "SALA 8"
Room "SALA 8"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 56
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Structure Functions and Low-x: Session-2 Room "SALA GOYA"
Room "SALA GOYA"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 60
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Spin Physics: Session-2 Room "SALA 9"
Room "SALA 9"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 65
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13:00
Lunch
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Diffraction and Vector Mesons: Session-3 Room "SALA 2-A"
Room "SALA 2-A"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 70
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Electroweak Physics and Beyond the Standard Model: Session-3 Room "SALA 7"
Room "SALA 7"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 74
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Heavy Flavours: Session-3 Room "SALA 2-B"
Room "SALA 2-B"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España-
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Theory update on the hadrons X(3872), X(3876), Z(4330) and related onesI will review the main debated issues on the nature of the new hadrons. Both the molecular and four-quark pictures are being challenged by data and the field still presents several open questions.Speaker: Antonio Polosa (INFN Roma 1 "La Sapienza")
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Properties of exotic charmonium-like mesons at CDFCDF reports the recent evidence for a new narrow resonance, Y(4140), decaying to J/psi phi final state, and reconstructed using 2.7 fb-1 of exclusive B+->J/psiphiK decays. Using the world's largest sample of X(3872)->J/psipipi decays, a study on the X(3872) mass and width aimed at testing the internal composition of this state is also described. This lead to the most precise X(3872) mass measurement to date and disfavors the hypothesis of the X(3872) being composed of two resonances closely spaced in mass.Speaker: Kai Yi (Physics and Astronomy Department-University of Iowa)
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New charmonium-like states at B factoriesSince the unexpected discovery of the X(3872) in 2003 the list of new charmonium-like states observed at B-factories keeps growing. BaBar and Belle have measured many properties, like masses, widths and quantum numbers of these states. The recent measurements are presented in this talk. Despite the progress on experimental and theoretical side a consistent picture explaining all states has not emerged.Speaker: Thomas Kuhr (University of Karlsruhe)
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Recent results on psi(3770) and open charm from BESII and CLEO-cWe present the latest results on the production and decays of psi(3770) and decays of open charm from BESII and CLEO-c experiments. BES observed anomalous line shape of cross sections for e+e- --> hadrons between 3.65 3.872 GeV and also measured line shapes of DD-bar production and the ratio of the production rates of D+D- and D0D0-bar at psi(3770) resonance. CLEO-c measured Ds decay constants from 600 pb-1 data near 4.17 GeV and measured absolute branching fractions for exclusive Ds semileptonic decays.Speaker: Jiangchuan Chen (IHEP, Beijing)
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Recent bottomonium results from BaBarI will present recent results in bottomonium physics from BaBar, including the first observation of the eta_b(1S) from Upsilon(3S)--> gamma eta_b(1S) decay and the confirmation of this discovery in Upsilon(2S)--> gamma eta_b(1S). I will also summarize BaBar results on the precision scan above the Upsilon(4S), the search for a light Higgs, and the search for Lepton Flavor Violation in Upsilon(nS) decays.Speaker: Veronique Ziegler (SLAC)
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Hadronic Final States and QCD: Session-3 Room "SALA 8"
Room "SALA 8"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 83
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Structure Functions and Low-x: Session-3 Room "SALA GOYA"
Room "SALA GOYA"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 88
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Spin Physics: Session-3 Room "SALA 9"
Room "SALA 9"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 92
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16:45
Coffee Break Palacio de Congresos
Palacio de Congresos
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España -
Diffraction and Vector Mesons: Session-4 Room "SALA 2-A"
Room "SALA 2-A"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 97
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Electroweak Physics and Beyond the Standard Model: Session-4 Room "SALA 7"
Room "SALA 7"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 102
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Heavy Flavours: Session-4 Room "SALA 2-B"
Room "SALA 2-B"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España-
105
Open charm hadroproduction and the charm content of the protonWe advocate charmed-hadron inclusive hadroproduction as a laboratory to probe intrinsic charm (IC) inside the colliding hadrons. Working at next-to-leading order in the general-mass variable-flavor-number scheme endowed with non-perturbative fragmentation functions recently extracted from a global fit to e^+e^- annihilation data from KEKB, CESR, and LEP1, we first assess the sensitivity of Tevatron data of D0, D^+, and D^{*+} inclusive production to the IC parameterizations provided by Pumplin et al. We then argue that similar data from pp collisions at RHIC would have the potential to discriminate between different IC models provided they reach out to sufficiently large values of transverse momentum.Speaker: Bernd Kniehl (University of Hamburg)
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Heavy-flavor results from PHENIX at RHICRecent PHENIX results on heavy flavor production in p+p and d+Au collisions at sqrt(s_NN) = 200 GeV will be presented. Quarkonia results include measured yields of J/psi and psi' as well as J/psi polarization versus transverse momentum in p+p collisions. High statistics J/psi yields versus rapidity and transverse momentum measured in d+Au collisions and their constraints on cold nuclear matter effects will also be discussed. Open heavy flavor results include measurements at mid rapidity of the ratio of single electrons from semi-leptonic decays of b and c quarks and their comparison to FONNL calculations.Speaker: Raphael Granier de Cassagnac (CNRS/IN2P3)
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STAR heavy-flavor resultsWe present a summary of the heavy flavor results from the STAR experiment. The study of heavy quark production in heavy ion collisions has been of interest in recent years because i) Heavy flavor decay electron production has been observed to be suppressed as much as light hadrons in the medium in contradiction with theoretical expectations and ii) the production of heavy quark bound states shows similar suppression as seen at lower energies, prompting reevaluations of the production mechanism of quarkonium. We discuss the latest results from STAR on these two topics.Speaker: Jaroslav Bielcik (NPI, Praque)
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ALICE potential for heavy-flavour physicsThe ALICE experiment, currently in the commissioning phase, will study nucleus--nucleus and proton--proton collisions at the CERN Large Hadron Collider (LHC). We review the ALICE heavy-flavour physics program and present a selection of results on the expected performance.Speaker: Giuseppe Bruno (University and INFN, Bari, Italy)
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Charm fragmentation and excited charm and charm-strange mesons at ZEUSThe charm fragmentation function has been measured in D* photoproduction with the ZEUS detector at HERA. The fragmentation function has been measured versus z, the ratio of E+p_parallel for the D* meson and that for the associated jet, where E is the energy and p_parallel the longitudinal momentum relative to the jet axis. The measured function is compared to different fragmentation models incorporated in leading-logarithm Monte Carlo simulations and a next-to-leading-order calculation. The results are similar to those from e+e- experiments. In addition, the production of excited charm, D_1(2420)0 and D_2^*(2460)0, and charm-strange, D_s1(2536)+/-, mesons has been measured with the ZEUS detector at HERA. The measured yields were converted to the rates of c quarks hadronising as a given excited D meson. The results are compared with those measured previously and with theoretical expectations.Speaker: Leonid Gladilin (Moscow State University)
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Hadronic Final States and QCD: Session-4 Room "SALA 8"
Room "SALA 8"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 110
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Structure Functions and Low-x: Session-4 Room "SALA GOYA"
Room "SALA GOYA"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 115
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Spin Physics: Session-4 Room "SALA 9"
Room "SALA 9"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 119
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Lambda longitudinal polarization dependence on the target polarization in SIDISSpeaker: Dr Aram Kotzinian
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Diffraction and Vector Mesons: Session-5 Room "SALA GOYA"
Room "SALA GOYA"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 124
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Electroweak Physics and Beyond the Standard Model: Session-5 Room "SALA 7"
Room "SALA 7"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 129
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Future Facilities: Session-1 Room "SALA 2-A"
Room "SALA 2-A"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 133
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Hadronic Final States and QCD: Session-5 Room "SALA 8"
Room "SALA 8"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 137
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Structure Functions and Low-x: Session-5 Room "SALA 2-B"
Room "SALA 2-B"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 142
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Spin Physics: Session-5 Room "SALA 9"
Room "SALA 9"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 146
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10:45
Coffee Break Palacio de Congresos
Palacio de Congresos
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España -
Joint Session: Diffraction and Vector Mesons + Spin Physics: Session-6 Room "SALA GOYA"
Room "SALA GOYA"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 151
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Electroweak Physics and Beyond the Standard Model: Session-6 Room "SALA 7"
Room "SALA 7"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 155
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Future Facilities: Session-2 Room "SALA 2-A"
Room "SALA 2-A"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 159
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Precision studies of QCD and EW interactionsSpeaker: Olaf Behnke (DESY)
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Heavy Flavours: Session-5 Room "SALA 9"
Room "SALA 9"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España-
163
Higher-order soft corrections to tt-bar productionWe present new predictions for the total cross section of $t \bar{t}$ at the Tevatron and the LHC through next-to-next-to-leading order. The results are based on the numerically dominant soft corrections. They are exact in all logarithmically enhanced terms near threshold, include the Coulomb corrections at two loops and exact scale dependence. We investigate the scale dependence as well as the sensitivity on the parton luminosity.Speaker: Ulrich Langenfeld (Zeuthen)
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164
Recent measurements of top quark production cross section at CDFWith the large data samples collected at the Tevatron, top quark physics has entered the realm of precision. We present here the latest results on top pair production cross section at CDF, which uncertainties are comparable to those of the theory prediction. The exciting results on the challenging channel of the electroweak production will also be shown.Speaker: Gervasio Gomez (Instituto de Física de Cantabria)
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165
Top Production Cross Sections at D0We report on measurements of the ttbar production cross section at a center-of-mass energy of 1.96 TeV at the D0 experiment during Run II of the Fermilab Tevatron collider. We use candidate events in lepton+jets and dilepton final states. In the most sensitive channel (lepton+jets channel), a neural network algorithm that uses lifetime information to identify b-quark jets is used to distinguish signal from background processes. We also present measurements of single top quark production at D0 using several multivariate techniques to separate signal from background: boosted decision trees, bayesian neural networks and matrix elements.Speaker: Jiri Kvita (Faculty of Mathematics and Physics, Charles University)
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ATLAS preparations for precise B-decays measurements sensitive to BSM phenomenaThe LHC experiments will perform sensitive tests of physics phenomena beyond the Standard Model (BSM). Investigation of decays of beauty hadrons represents an alternative approach in addition to direct BSM searches. The ATLAS efforts concentrate on those B decays that can be selected already at the first and second trigger levels. The most favorable trigger signature will be for B hadrons decaying to J/psi -> mumu Using this trigger ATLAS will be able to accommodate unprecedentedly high statistics in so called Golden LHC channel: Bs->J/psi phi allowing a measurement of the CP violation effect, where BSM models predicted values are significantly higher than SM. In the rare decays sector, these are purely di-muon decays, and families of semi-muonic exclusive channels. Already with 1 fb-1 the ATLAS sensitivity in the di-muon channels will be comparable to today worlds statistics. The strategy is to carry on the di-muon channel programme up to nominal LHC luminosity. In particular in each of these two experiments the Bs -> mumu signal with 4.3 sigma significance can be measured combining low luminosity samples with those of one year of LHC operation at a luminosity of 10^34 cm-2 s-1. This precision allows excludingvor confirming the SM unambiguously.Speaker: Konstantin Toms (University of New Mexico)
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Hadronic Final States and QCD: Session-6 Room "SALA 8"
Room "SALA 8"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España-
167
Measurement of di-jet angular distributions (D0)Speaker: Nirmalya Parua
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Structure Functions and Low-x: Session-6 Room "SALA 2-B"
Room "SALA 2-B"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 173
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13:00
Lunch
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Diffraction and Vector Mesons: Session-7 Room
Room
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España-
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Talk cancelled
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Joint Session: Electroweak Physics and Beyond the Standard Model + Hadronic Final States and QCD: Session-7 Room "SALA 7"
Room "SALA 7"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 183
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Future Facilities: Session-3 Room "SALA 2-A"
Room "SALA 2-A"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 188
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Heavy Flavours: Session-6 Room "SALA 8"
Room "SALA 8"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España-
192
Variable-flavour-number scheme in the analysis of heavy-quark electro-production dataWe perform QCD fit of parton distribution functions (PDFs) based on the existing inclusive DIS data supplemented by the Drell-Yan ones. The DIS heavy-quark contribution is calculated in the variable-flavour-number (VFN) scheme with the heavy-quark PDFs generated from ones of the fixed-flavour-number (FFN) scheme using the matching conditions by Buza-Matiounine-Smith-van Neerven. Comparison to the variant of analysis within the FFN scheme is performed. Prediction of the two variants of fit are compared to the heavy-quark electro-production data by the HERA experiments. Applications for the LHC phenomenology are considered.Speaker: Serguei Alekhin (State Res.Center of Russian Feder. Inst.f.High Energy Phys. (IFVE))
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193
Moments of the 3-loop corrections to the heavy flavor contribution to F2(x,Q2) for Q^2 >> m^2Precision tests of QCD based on deeply inelastic scattering data require a precise knowledge of the heavy flavor contributions to the structure functions. We report on recent calculations of moments of the heavy flavor Wilson coefficients at O(alpha_s^3) contributing to F_2^c. Our results are valid in the region Q^2/m_c^2 > 10 GeV^2 and derive from the use of the technique of massive operator matrix elements.Speaker: Sebastian Klein (Zeuthen)
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194
Extraction of F2c(x,Q2) from D* cross sections at H1The charm contribution to the proton structure, F2^c(x,Q2), is determined using the inclusive cross sections of D*+-(2010) meson production in deep-inelastic scattering at HERA. F2^c(x,Q2) is extracted from the visible D*+- cross sections in the range 5 < Q2 < 1000 GeV^2, 0.02 < y < 0.7, p_T(D*) > 1.5 GeV and |eta(D*)| < 1.5 which were measured with the H1 experiment in the HERA-II running period corresponding to an integrated luminosity of 347 pb^-1. The charm contribution to the proton structure, F2^c(x,Q2), is determined by extrapolating the visible charm cross section to the full phase space using a Next-to-Leading order QCD calculation based on DGLAP evolution and a Leading order Monte-Carlo program including parton showers based on CCFM evolution. The extrapolation uncertainties are studied varying the theory parameters like charm mass, renormalisation and factorisation scales as well as the fragmentation model.Speaker: Andreas Jung (DESY)
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195
Charm production in DIS and the measurement of F2cc at ZEUSCharm production has been measured in the deep inelastic scattering regime with the ZEUS detector at HERA. Charm was reconstructed by identifying charmed mesons (D*, D+, D0) in the final state, or through its decay into muons. Differential cross sections were measured and compared to next-to-leading order QCD predictions. The charm contribution to the proton structure function F2, F2cc, was extracted and compared with theoretical predictions using different parameterisations of the proton PDFs.Speaker: Philipp Roloff (Deutsches Elektronen-Synchrotron (DESY))
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D*+- production at high Q2 with the H1 detectorInclusive production of D*+- -mesons in deep inelastic scattering at HERA is studied at high photon virtualities Q2>100 GeV^2 for the first time with the H1 experiment. The data were collected during the years 2004-2007 and correspond to an integrated luminosity of 351 pb^-1. D*-mesons are reconstructed in their decays D*+- -> D0+ pi_slow+- -> K-+ pi+- pi_slow+-. The visible range for the measurement covers the pseudorapidity interval |eta(D*)|<1.5, transverse momenta p_T(D*)>1.5 GeV, and inelasticity in the scattering process 0.02 < y < 0.7. Differential cross sections are compared to predictions from the next-to leading order calculation HVQDIS and the leading order Monte Carlo codes RAPGAP and CASCADE.Speaker: Martin Brinkmann (University of Hamburg)
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Structure Functions and Low-x: Session-7 Room "SALA 2-B"
Room "SALA 2-B"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 197
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Spin Physics: Session-7 Room "SALA 9"
Room "SALA 9"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 202
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16:45
Coffee Break Palacio de Congresos
Palacio de Congresos
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España -
Joint Session: Diffraction and Vector Mesons + Structure Functions and Low-x: Session-8 Room "SALA GOYA"
Room "SALA GOYA"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 206
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Electroweak Physics and Beyond the Standard Model: Session-8 Room "SALA 7"
Room "SALA 7"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 210
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Future Facilities: Session-4 Room "SALA 2-A"
Room "SALA 2-A"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 214
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Heavy Flavours: Session-7 Room "SALA 8"
Room "SALA 8"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España-
219
Global PDF analysis in an intermediate-mass schemeThe zero-mass (ZM) parton formalism is widely used in high-energy physics because of its simplicity and historical importance, even while the latest global QCD analyses are carried out in the more precise general-mass (GM) QCD formalism. We explore the possibility of rectifying obvious kinematical inconsistencies of the conventional implementation of the ZM formalism, while preserving the simplicity of its matrix elements. The resulting intermediate-mass (IM) scheme for perturbative QCD calculation can be regarded either as an improved ZM formulation with the correct treatment of heavy-flavor final state kinematics; or, alternatively, as a simplifed GM formulation with approximate ZM hard cross sections. I discuss representative global analyses based on the IM formulation, and show that they come quite close to reproducing the more accurate GM results.Speaker: Pavel Nadolsky (Southern Methodist University)
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Heavy flavour effects in the virtual photon structure functions to NLO in QCDWe investigate the heavy quark mass effects in the virtual photon structure functions in the framework of the mass-independent renormalization group. We study a formalism in which the heavy quark mass effects are treated based on parton picture as well as on the operator product expansion, and perform the numerical evaluation of the effective virtual photon structure function to the next-leading order in QCD.Speaker: Tsuneo Uematsu (Kyoto)
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F2cc and F2bb using the H1 vertex detector at HERA and the combination with the D* methodThe inclusive charm and beauty cross sections are measured in e-p and e+p collisions at HERA II in the kinematic region of photon virtuality 5 < Q2 < 650 GeV^2 and Bjorken scaling variable 0.0002 < x < 0.032. The data were collected with the H1 detector in 2006 and 2007 corresponding to an integrated luminosity of 189 pb^-1. The charm and beauty fractions are determined using a neural network which includes inputs, as measured by the H1 vertex detector, of the impact parameter of tracks to the primary vertex and the position of the secondary vertex. The measurements are compared with previous data, NLO and NNLO QCD predictions. The combination of recent results on the charm contribution, F2^c, to the inclusive proton structure function F2 in deep inelastic scattering at HERA is presented. At the H1 experiment F2^c(x,Q2) is determined either from the measured production cross section of D*+-(2010) mesons or by making use of the long lifetime of heavy quarks. The combination of both charm tag methods accounts for correlations of the systematic uncertainties of the measurements and leads to significant improvements of precision.Speaker: Paul Daniel Thompson (Birmingham)
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Beauty production in in DIS and the measurement of F2bb at ZEUSBeauty production has been measured in the deep inelastic scattering regime with the ZEUS detector at HERA. Beauty was reconstructed using its semi-leptonic decay into muons. The beauty signal was separated from the background using lifetime information and the transverse momentum of the muon with respect to the axis of the jet coming from the hadronisation of the b quark, ptrel. Differential cross sections were measured and compared to next-to-leading order QCD predictions. The beauty contribution to the proton structure function F2, F2bb, was extracted and compared with theoretical predictions using different parameterisations of the proton PDFs.Speaker: Marcello Bindi (Universita & INFN, Bologna)
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Hadronic Final States and QCD: Session-8 Room "SALA 2-B"
Room "SALA 2-B"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 223
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Spin Physics: Session-8 Room "SALA 9"
Room "SALA 9"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 228
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Conference Dinner Restaurant Pedro Larumbe
Restaurant Pedro Larumbe
C/ Serrano, 61 -4ª pl. 28006 Madrid
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Joint Session: Diffraction and Vector Mesons + Spin Physics: Session-9 Room "SALA GOYA"
Room "SALA GOYA"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 232
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Electroweak Physics and Beyond the Standard Model: Session-9 Room "SALA 7"
Room "SALA 7"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 237
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Future Facilities: Session-5 Room "SALA 2-A"
Room "SALA 2-A"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 241
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Heavy Flavours: Session-8 Room "SALA 2-B"
Room "SALA 2-B"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España-
245
Quark Model and the Spectroscopy of the b-baryonsI discuss several recent highly accurate theoretical predictions for masses of baryons containing the b quark, as well as an effective supersymmetry between heavy quark baryons and mesons. I also suggest some possibilities for observing exotic hadrons containing heavy quarks.Speaker: Marek Karliner (Tel-Aviv)
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Charmonia and bottom production measurements with J/psi events at LHCbWe report on the possibilities of measuring charmonia and bottom production with the LHCb experiment. Using reconstructed J/psi decays to mu+ mu-, both the prompt J/psi and b -> J/psi production cross-sections in pp collisions at LHC energies will be determined in the J/psi eta range 2-5. Due to the very large statistics, this analysis will be possible very early after the LHC start. Other charmonia related measurements will also be discussed, such as that of the J/psi polarization at production or of the production of some of the new X, Y and Z states.Speaker: Matthew David Needham (EPFL)
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Production of exclusive charmonium at CDFWe present the study of the exclusive production of charmonia via the reactions p + pbar --> p + X + p with X being a centrally produced J/psi, psi(2s) or chi_c, using 1.48 fb-1 of proton-antiproton collision data collected by the Run-II Collider Detector at Fermilab at sqrt(s)=1.96 TeVSpeaker: James Pinfold (University of Alberta)
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Measurement of Bc mass and lifetime at LHCbThe Bc mass and lifetime measurements using the exclusive decay Bc->Jpsi pi at the LHCb experiment were studied. About 310 signal events are expected for a data set which corresponds to an integrated luminosity of 1 fb-1, with a B/S ratio around 2. Based on these data, the Bc mass and lifetime can be measured with expected statistical errors below 2 MeV/c^2 and 30 fs, respectively.Speaker: Jibo He (Laboratoire de l'Accélérateur Linéaire (LAL))
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245
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Hadronic Final States and QCD: Session-9 Room "SALA 8"
Room "SALA 8"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 250
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Structure Functions and Low-x: Session-9 Room "SALA 9"
Room "SALA 9"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 255
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10:45
Coffee Break Palacio de Congresos
Palacio de Congresos
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España -
Diffraction and Vector Mesons: Session-10 Room
Room
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 259
- 260
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Electroweak Physics and Beyond the Standard Model: Session-10 Room "SALA 7"
Room "SALA 7"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 263
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Heavy Flavours: Session-9 Room "SALA 2-B"
Room "SALA 2-B"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España-
269
Recent results on charmonium production at HERA-BHERA-B is a fixed target experiment at the 920 GeV HERA proton beam at DESY which uses a variety nuclear targets. A di-lepton trigger can select events containing leptonic J/psi decays. During the 2002/2003 HERA-B run, 150 million di-lepton triggers and 200 million minimum bias triggers were recorded. About 300.000 leptonic J/psi decays (~170.000 J/psi -> mu^+mu^- and ~130.000 J/psi -> e^+e^-) were acquired with the di-lepton trigger. A complete study of the charmonium production (such as J/psi, psi' and chi_c states) in the negative Feynman x region (x_F), and of the J/psi polarization will be presented. Results will be given also on the nuclear dependence of charmonium production, on chi_c and psi' production and the determination of the b b-bar cross section in proton-nucleus collisions.Speaker: Roberto Spighi (Bologna)
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Quarkonium production in CMSWe present expected sensitivities for the measurement of the charmonium production cross section in pp collisions using the CMS detector at the LHC. The analysis is performed on a Monte Carlo sample simulating expected conditions for early data, and includes lifetime information to separate prompt and non-prompt J/psi production.Speaker: Carlos Lourenco (CERN)
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271
B baryons at D0Although predicted by the quark model only a few of the B baryons predicted had been observed. D0 set out to search for two of those predicted, the Cascade_b and the Omega_b. The Cascade_b was observed in 2007 and the Omega_b in 2008. The search and observation was possible thanks to the reprocessing of events that include J/psi in such a way that the efficiency to reconstruct low pT charged tracks and charged tracks with large impact parameters was higher. This technique along with the use of multivariate techniques made possible the observation of both resonances. The Omega_b in the decay channel Omega + J/psi and the Cascade_b in Cascade J/psi.Speaker: Peter Ratoff (Lancaster University, UK)
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Heavy Flavour production in ATLASATLAS prepared a program for measurements of production cross sections both of b-hadrons and Onia in central proton-proton collisions at new energy 14 TeV of LHC. Dedicated triggers based on muon, di-muon or electron signatures are designed to accommodate large statistics with already first several months. Starting from semi-inclusive measurements for very early stage exclusive channels will soon dominate measurements, allowing tests of QCD in Heavy Flavour sector already with 10 pb-1. With larger statistics production polarization measurements are being prepared for J/psi and Lambda_b. It is expected that 30 fb-1 collected at 10^33 cm-2 s-1 will allow specific measurements not accessible with limited statistics of Tevatron. In particular Lambda_b polarization measurement can be achieved using Lambda_b -> J/psi Lambda decay. In J/psi a polarization measurement will allow to confirm or exclude model predictions within large interval of transverse momenta.Speaker: Thorsten Stahl (University of Siegen)
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Round-table discussion on heavy-flavour studies in LHC era
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Hadronic Final States and QCD: Session-10 Room "SALA 8"
Room "SALA 8"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 274
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Spin Physics: Session-10 Room "SALA 9"
Room "SALA 9"
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España- 281
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Free Time / Visit to Prado Museum Paseo del Prado, Madrid, 28014 (CERN)
Paseo del Prado, Madrid, 28014
CERN
Paseo del Prado, Madrid, 28014
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Plenary Session: Chair: Anthony Thomas (Jefferson Lab)
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10:30
Coffee Break Palacio de Congresos
Palacio de Congresos
Palacio de Congresos de Madrid
Paseo de la Castellana, 99 28046 Madrid España -
Plenary Session: Chair: David Saxon (University of Glasgow)
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Lunch
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Plenary Session: Chair: John Dainton (Cockcroft Institute)
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LHeC/EIC Panel DiscussionSpeakers: Abhay Deshpande (KEK), Allen Caldwell (Max-Planck-Institut fuer Physik Munich), Anthony Thomas (Jefferson Lab), Max Klein (Institut fuer Hochenergiephysik Zeuthen), Sergio Bertolucci (CERN), Steve Vigdor (Brookhaven National Laboratory)
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Coffee Break
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Plenary Session: Chair: Joachim Mnich (DESY)
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