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Oleg Kuprash (DESY)27/03/2012, 09:00Hadronic final statesIsolated-photon+jet production in ep collisions at a centre-of-mass energy of 318 GeV has been measured with the ZEUS detector at HERA using an integrated luminosity of up to 300 pb-1. Measurements of prompt-photon+jet cross sections are presented as functions of the photon transverse energy and pseudorapidity in a wide range of exchanged-photon virtuality. In addition, differential gamma+jet...Go to contribution page
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27/03/2012, 09:20Hadronic final statesPrompt isolated photon pairs production cross sections, as well as direct photon production in association with a heavy (b or c) quark jets are presented. Differential cross sections are presented as a function of several variables. The results are compared with a next-to-leading order perturbative QCD calculations.Go to contribution page
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Nikolai Skachkov (Joint Inst. for Nuclear Research (RU))27/03/2012, 09:40Hadronic final statesPhoton+jets measurements in ppbar Collisions at D0Go to contribution page
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Leonardo Carminati (Universitร degli Studi e INFN Milano (IT))27/03/2012, 10:00Hadronic final statesIsolated prompt photons provide a direct probe of short-distance physics, complementary to that provided by measurements of jets or vector-bosons. The inclusive prompt photon cross section has been measured over a wide range of transverse momenta; the diphoton cross section has also been measured as a function of diphoton mass, total transverse momentum and azimuthal separation; the cross...Go to contribution page
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Andrea Banfi (Freiburg U)27/03/2012, 11:00Hadronic final statesWe present accurate (NLL+NNLO) predictions for jet-veto efficiencies for Higgs and Z production at the LHC, obtained with the automated resummation program CAESAR. We discuss all sources of theoretical uncertainties associated to the presented results, highlighting which further calculations would be needed in order to reduce them.Go to contribution page
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Peter Schichtel (ITP)27/03/2012, 11:20Hadronic final statesThe properties of jets are used in many LHC physics searches. Higgs searches use jet vetoes and fixed recoil jet multiplicities. Searches for new physics particles require a careful distinction of decay jets from QCD jet radiation. We show that the exclusive number of jets at hadron colliders can be described with two simple patterns: staircase scaling and Poisson scaling. In photon plus...Go to contribution page
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Adam Yurkewicz (Northern Illinois University (US))27/03/2012, 11:40Hadronic final statesDifferential jet cross sections and distributions have been measure inclusively, in dijet events and in multijet events, using information from the ATLAS calorimeters and tracking detectors. The inclusive jet measurements extend from 20 GeV to 1.5 TeV, and the dijet measurements cover a very wide mass range. Measurements based on tracking alone are sensitive only to the charged-particle...Go to contribution page
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Thomas Schoerner-Sadenius (Deutsches Elektronen-Synchrotron (DE))27/03/2012, 12:00Hadronic final statesJets and multi-jets at large rapidities in p-p collisions at the LHCGo to contribution page
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Jennifer Smillie27/03/2012, 12:20Hadronic final statesThe theoretical description of multi-jet final states is an issue of great importance at the LHC. The High Energy Jets (HEJ) framework offers a new approach to this and provides an all-order resummation of the dominant contributions from wide-angle QCD radiation. I will give a brief introduction to the framework and then show comparisons to early data from ATLAS and CMS analyses and...Go to contribution page
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Nikolai Skachkov (Joint Inst. for Nuclear Research (RU))27/03/2012, 14:00Hadronic final statesW/Z+jets measurements at D0Go to contribution page
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Lorenzo Ortolan27/03/2012, 14:20Hadronic final statesInclusive Z boson plus jets cross sections, as well as bottom jet production in association with a Z-boson cross sections, are measured in a final state where the Z boson has decayed in two muons or electrons. Results are based on $\sim 9$ fb$ ^{-1}$ of data in $\rm p\bar{p}$ collisions at $\rm \sqrt{s}$ = 1.96 TeV collected with the CDF detector in Run II. Differential cross sections...Go to contribution page
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Camille Belanger-Champagne (McGill University (CA))27/03/2012, 14:40Hadronic final statesThe production of jets in association with a W or Z boson in proton-proton collisions at 7 TeV is an important process to understand in QCD. The cross section, differential in several kinematics variables, has been measured up to high jet multiplicities and compared to new higher-order QCD calculations. The ratio of (Z + a single jet)/(W + a single jet) can provide a very precise test of...Go to contribution page
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Frank Siegert (Albert-Ludwigs-Universitaet Freiburg (DE))27/03/2012, 15:00Hadronic final statesThe MC@NLO method as implemented in the Sherpa MC generator is presented using the production of W-bosons in conjunction with up to three jets as an example. Corresponding results computed at next-to leading order in QCD and including parton shower corrections are compared to recent experimental data from the Large Hadron Collider.Go to contribution page
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Stefan Prestel (L)27/03/2012, 15:20Hadronic final statesWe present the recent implementation of CKKW-L merging inside Pythia8, and comment on the treatment of multiparton interactions in the context of matrix element merging. Since multiple interactions inside Pythia8 are fully interleaved with space- and time-like showers, care has to be taken when allowing for MPI. Further, we will discuss the uncertainties of the implementation.Go to contribution page
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Simon Plaetzer (DESY Hamburg)27/03/2012, 15:40Hadronic final statesParton shower Monte Carlos are by now standard tools to simulate hadronic final states. Having seen a tremendous improvement of combining parton showers and fixed order calculations in recent years, efforts are now underway to improve the shower approximations themselves, as well. In this contribution we will present first steps towards including subleading colour contributions into...Go to contribution page
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Dr Michal Deak (Universidade de Santiago de Compostela)27/03/2012, 16:30Hadronic final statesWe present a subtraction method for including next to leading order corrections to a 2 to 2 jet production process in kt-factorisation equivalent to a jet matching procedure in Monte Carlo generators. We study the improvement in soft cut dependance.Go to contribution page
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Mr Maxim Malyshev (SINP MSU)27/03/2012, 16:50Hadronic final statesIn the framework of the kt-factorization approach, the production of unpolarized Drell-Yan lepton pair at high energies is studied. The consideration is based on the O(alpha) and $O(alpha alpha_s) off-shell partonic matrix elements with virtual photon and Z boson exchange. The calculations include leptonic decays of Z bosons with full spin correlations as well as gamma - Z interference. The...Go to contribution page
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Daniel Wilhelm (Mainz U)27/03/2012, 17:10Hadronic final statesWe discuss the differential cross sections for electroweak gauge-boson and Higgs production at small and very small transverse momentum q_T. Large logarithms are resummed using soft-collinear effective theory. The collinear anomaly generates a non-perturbative scale q^โ, which protects the processes from receiving large long-distance hadronic contributions. A numerical comparison of our...Go to contribution page
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Jason Gallicchio (UC Davis)27/03/2012, 17:30Hadronic final statesDistinguishing light-quark jets from gluon jets on an event-by-event basis could significantly enhance the reach for many new physics searches at the Large Hadron Collider. Through an exhaustive search of existing and novel jet substructure observables, we find that a multivariate approach can filter out over 95% of the gluon jets while keeping more than half of the light-quark jets. Moreover,...Go to contribution page
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Daniel Andreas Britzger (Ludwig-Maximilians-Universitat Munchen)27/03/2012, 17:50Hadronic final statesNew results on normalised inclusive jet, di-jet and trijet differential cross sections in neutral current deep-inelastic ep scattering (DIS) based on a regularised unfolding procedure are presented. Detector effects like acceptance and migrations as well as statistical correlations between the multi-jets and the inclusive DIS events are taken into account in this procedure. The DIS phase space...Go to contribution page
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ewald paul (P)27/03/2012, 18:10Hadronic final statesDifferential inclusive-jet cross sections have been measured in photoproduction for boson virtualities Q2 < 1 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 300 pb-1. Jets were identified in the laboratory using the kt cluster algorithm in the longitudinally inclusive mode. Cross sections are presented as functions of the jet pseudorapidity, etajet,and the jet...Go to contribution page
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Ferenc Sikler (Hungarian Academy of Sciences (HU))28/03/2012, 13:30Hadronic final statesInclusive hadron production (multiplicities and spectra) in p-p collisions in CMSGo to contribution page
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Markward Britsch (Max-Planck-Gesellschaft (DE))28/03/2012, 13:50Hadronic final statesDue to its unique pseudorapidity coverage and the possibility of providing measurements at low transverse momenta, the LHCb detector allows unique insight into particle production in the forward region at the LHC. The latest LHCb soft-QCD results, the measurements of charged particle multiplicity at 7 TeV and the measurement of the ๏ฃฅp/p, K-/K+, ฯ-/ฯ+, (๏ฃฅp+p)/(ฯ-+ฯ+), (K-+K+)/( ฯ-+ฯ+ )...Go to contribution page
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Ms Nour Makke (Trieste UNiversity, INFN)28/03/2012, 14:10Hadronic final statesFragmentation functions, which turn partons into non-perturbative hadronic bound states in hard-scattering reactions, play a very important role in our understanding of the proton structure. Currently, our knowledge of fragmentation functions originates mainly from existing global QCD analyses which are mostly based on inclusive measurements in electron-positron annihilation process. While...Go to contribution page
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Mr Gevorg Karyan (A.I. Alikhanyan National Science Laboratory)28/03/2012, 14:30Hadronic final statesHadron multiplicity ratios in semi-inclusive deep-inelastic scattering have been measured on neon, krypton and xenon targets relative to deuterium using the 27.6 GeV beam of HERA at the HERMES experiment. They are presented for pions (ฯ+, ฯ-), kaons (K+, K-), protons and anti-protons as a function of the virtual photon energy ฮฝ, its virtuality Q2, the fractional hadron energy z and the...Go to contribution page
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Iris Abt (Werner-Heisenberg-Institut)28/03/2012, 14:50Hadronic final statesScaled momentum distributions for the strange hadrons K0s and Lambda/Lambdabar were measured in deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 330 pb-1. The evolution of these distributions with the photon virtuality, Q2, was studied in the kinematic region 10 < Q2 < 40000 GeV2 and 0.001 < x < 0.75, where x is the Bjorken scaling variable....Go to contribution page
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Dr Valery Lyuboshitz (Joint Institute for Nuclear Research, Dubna, Russia)28/03/2012, 15:10Hadronic final statesThe phenomenological structure of inclusive cross sections of the production of two neutral K mesons in hadron-hadron, hadron-nucleus and nucleus-nucleus collisions is investigated taking into account the strangeness conservation in strong and electromagnetic interactions. Relations describing the dependence of the correlations of two short-lived and two long-lived neutral kaons $K^0_S...Go to contribution page
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Adam Robert Davison (University College London (UK))28/03/2012, 16:00Hadronic final statesThe internal structure of jets produced in proton-proton collisions at 7 TeV centre-of-mass energy provides a direct test of QCD calculations of gluon and quark radiation, as well as having sensitivity to hadronisation and underlying event. The transverse energy distribution around the jet core has been measured, as well as the fragmentation of a jet into charged particles. Jet shapes -...Go to contribution page
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Simone Marzani (IPPP Durham)28/03/2012, 16:20Hadronic final statesWe study the jet-mass distribution for jets produced in hadron-hadron collision in QCD. In order to obtain reliable phenomenological results we resum to all-order in perturbation theory those contributions coming from collinear and soft gluons. Beyond the leading-logarithmic accuracy the resummation is made more complicated by the presence of non-global logarithms and logarithms related to the...Go to contribution page
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Zhao Li (Michigan State University)28/03/2012, 16:40Hadronic final statesJet Substructure at Hadron CollidersGo to contribution page
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้ไน ็ซนๅ (Heidelberg)28/03/2012, 17:00Hadronic final statesTop momentum reconstruction often plays an important role for new physics signal reconstruction at the LHC. In principle for a hadronically decaying top, it is possible to reconstruct its momentum fully but one suffers from large QCD and combinatorial backgrounds. Starting from geometrically large sizes of jets and looking into their substructure, we can efficiently reduce these background....Go to contribution page
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Hans Jozef H Van Haevermaet (University of Antwerp (BE))29/03/2012, 11:00Hadronic final statesCharacterization of the underlying event in p-p collisions in CMSGo to contribution page
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Dr Arthur Moraes (University of Glasgow (GB))29/03/2012, 11:20Hadronic final statesThe majority of proton-proton collisions at the LHC contain only soft, low transverse-momentum scatters. Such scatters also occur between the remnants of the protons in conjunction with short-distance, high momentum scatters. Measurements of soft particle production and energy flow are presented fir a wide range of different kinematic selections; correlations between the produced...Go to contribution page
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Dmytro Volyanskyy (Max-Planck-Gesellschaft (DE))29/03/2012, 11:40Hadronic final statesWe present the results on the energy flow measured with minimum-bias data collected by the LHCb experiment in $pp$ collisions at $\sqrt{s}=7$~TeV for inclusive minimum bias interactions, hard scattering processes and events with enhanced or suppressed fractions of diffractive contributions. The measurements are performed in the pseudorapidity range $2<\eta<5$ which corresponds to the main...Go to contribution page
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Anna Zsigmond (Hungarian Academy of Sciences (HU))29/03/2012, 12:00Hadronic final statesInelastic cross section measurement in p-p collisions in CMSGo to contribution page
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Christian Roehr (K)29/03/2012, 12:20Hadronic final statesWe review the modelling of multiple interactions in the event generator Herwig++ and study implications of recent tuning efforts to Tevatron and LHC data. A crucial ingredient to a successful description of minimum bias and underlying event observables is a model for colour reconnection. Improvements to this model inspired by statistical physics are presented.Go to contribution page
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