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Ashish Kumar (SUNY Buffalo)15/08/2013, 13:50QCD Physicsoral presentationStudies of associated production of a W, Z or photon with jets provide important tests of perturbative quantum chromodynamics calculations. A good understanding of such processes is essential in part because they constitute a major background to the production of the standard model Higgs boson in association with a vector boson. Recent measurements of the production of a vector boson plus...Go to contribution page
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Peter Onyisi (U. Texas Austin)15/08/2013, 14:10QCD Physicsoral presentationCompared to inclusive J/psi production, the associated production of weak vector bosons and J/psi mesons in hadron collisions selects a different set of partonic initial states and provides complementary information on quarkonium production mechanisms. Using 4.6 inverse femtobarns of pp collisions at sqrt(s) = 7 TeV recorded by ATLAS, we observe and measure the rate of W+J/psi associated...Go to contribution page
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Mr Rajivalochan Subramaniam (Louisiana Tech University)15/08/2013, 14:30QCD Physicsoral presentationA measurement of angular correlations of jets in hadron collisions is presented. This measurement is sensitive to QCD dynamics and to the strong coupling constant, while being only weakly sensitive to parton distribution functions. The observable is the number of neighboring jets above a given transverse momentum threshold which accompany a given jet within a distance $\Delta R$ in the plane...Go to contribution page
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Prof. chunhui chen (Iowa State University)15/08/2013, 14:50QCD Physicsoral presentationWe introduce a new approach to study jet substructure in the center-of-mass frame of the jet. We demonstrate that it can be used to discriminate the boosted heavy particles from the QCD jets and the method is complimentary to the existing other jet substructure algorithms. Applications to searches for hadronically decaying W/Z+jets, top jet and heavy resonance that decays to final states with...Go to contribution page
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Dr Ray Culbertson (FNAL)15/08/2013, 16:00QCD Physicsoral presentationThe CDF Collaboration continues to analyze the complete, legacy dataset of approximately 10 fb-1. This report will cover several recent analyses which feature high-energy photons. QCD hard interactions and proton structure can be probed by comparing measurements of photon cross sections to state-of-the-art calculations. We will report cross section measurements for events with...Go to contribution page
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Nobuo Sato (Florida State University)15/08/2013, 16:20QCD Physicsoral presentationThe precise knowledge of parton distribution functions at large-x is important in order to understand the production of a massive state at forward rapidities at the LHC. Currently, the gluon PDF is highly unconstrained at large-x and it is mainly constrained by jet data. In the past, direct photon production with high transverse momentum at fixed target experiments was used to constrain gluon...Go to contribution page
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Mr David Westmark (Florida State University)15/08/2013, 16:40QCD Physicsoral presentationThe precise knowledge of parton distribution functions (PDFs) is indispensable to the accurate calculation of hadron-initiated QCD hard scattering observables. Much of our information on PDFs is extracted by comparing deep inelastic scattering (DIS) and lepton pair production (LPP) data to convolutions of the PDFs with the partonic cross sections of these processes. It is known that partonic...Go to contribution page
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Radja Boughezal (Argonne)16/08/2013, 08:30QCD Physicsoral presentationReview of recent higher-order QCD calculations.Go to contribution page
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Dr Pavel Nadolsky (Southern Methodist University)16/08/2013, 09:10QCD Physicsoral presentationReview of recent progress on PDFs.Go to contribution page
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Dr Simone Alioli (Lawrence Berkeley National Laboratory)16/08/2013, 09:40QCD Physicsoral presentationReview of recent progress in matching higher order calculations and parton showers.Go to contribution page
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Dr Christopher Kelly (Columbia University)16/08/2013, 10:40QCD Physicsoral presentationDirect CP-violation was first observed in the late 1990s in K->pi pi decays, and precise experimental measurements have since been made. However until recently it has not been possible to calculate its measure directly from the Standard Model due to it receiving large contributions from QCD in the hadronic regime in which perturbation theory is not applicable. This is unfortunate because these...Go to contribution page
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Dr Ye Li (SLAC)16/08/2013, 11:00QCD Physicsoral presentationWe study the change in the di-photon invariant mass distribution for Higgs boson decays to two photons, due to interference between the Higgs resonance in gluon fusion and the continuum background amplitude for gluon pair to photon pair. Previously, the apparent Higgs mass was found to shift by around 100 MeV in the Standard Model in the leading order approximation, which may potentially be...Go to contribution page
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Ms Sonam Mahajan (Panjab University, Chandigarh, India)16/08/2013, 11:20QCD Physicsoral presentationThe Main Injector Particle Production (MIPP) experiment at Fermilab is a fixed target hadron production experiment. It measures particle production in interactions of 120 GeV/c primary protons from the Main Injector and secondary beams of $\pi^{\pm}, \rm{K}^{\pm}$, p and $\bar{\rm{p}}$ from 5 to 90 GeV/c on nuclear targets which include H, Be, C, Bi and U, and a dedicated run with the NuMI...Go to contribution page
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David Muller (SLAC)16/08/2013, 11:40QCD Physicsoral presentationInclusive hadron production cross sections in e+e- collisions shed light on fundamental questions of hadronization and fragmentation processes. We present measurements of inclusive spectra of various light hadrons produced in e+e- collisions at a center-of-mass energy of about 10.5 GeV. These results help test the scaling properties of the cross sections by comparison with previous...Go to contribution page
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David Brown (University of Louisville)16/08/2013, 14:30QCD Physicsoral presentationBaryonic decays account for about 7% of the B-meson width, and have been studied in recent years by the B factories. These studies reveal properties of hadronization at low q^2, such as s anti-s suppression known from jet fragmentation, and phase space relations between the baryon and antibaryon. The measurement and comparison of exclusive branching fractions of baryonic B decays...Go to contribution page
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Mr Prabhakar Palni (on behalf of the CDF collaboration)16/08/2013, 14:50QCD Physicsoral presentationUsing data from proton-antiproton collisions at center of mass energy of 1.96 TeV recorded by the CDF II detector at the Fermilab Tevatron, evidence for the excited resonance state Lambda_b* is presented in its fully reconstructed decay mode to Lambda_b0 pi+ pi- where Lambda_b0 decays to Lambda_c+ pi- with Lambda_c+ decays to p K- pi+. The analysis is based on a data sample corresponding to an...Go to contribution page
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Concetta Cartaro (SLAC)16/08/2013, 15:10QCD Physicsoral presentationWe present a study of the e+e- --> p anti-p process using initial state radiation with BABAR. The BABAR data sample, 469 fb-1, collected at and near Y(4S) has been used to measure the e+e- --> p anti-p cross section and the proton effective electromagnetic form factor. The ratio of the electric and magnetic form factors has been extracted from an analysis of the proton angular...Go to contribution page
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Dr Emanuele Santovetti (INFN - Roma Tor Vergata)16/08/2013, 15:30QCD Physicsoral presentationStudies of quarkonia production in the forward region provide important tests of NRQCD. The LHCb experiment has collected a dataset corresponding to an integrated luminosity of about 3 fb-l in proton-proton collisions at sqrt(s)= 7 and 8 TeV. We present studies of the production and polarisation of the J/psi, psi(2S) and chi_c charmonium states as well as those of Upsilon and chi_b bottomonia....Go to contribution page
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Dr Wei Chen (University of Saskatchewan)16/08/2013, 16:10QCD Physicsoral presentationWe have calculated the correlation functions of heavy quarkonium hybrid operators with various $J^{PC}$ quantum numbers to include QCD condensates up to dimension six. As observed before, the dimension six condensates could stabilize the hybrid sum rules and permit reliable mass predictions. After performing the QCD sum rule analysis, we extract the masses of charmonium and bottomonium...Go to contribution page
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Eric Braaten (Ohio State University)16/08/2013, 16:30QCD Physicsoral presentationFlavor-exotic tetraquark mesons have recently been observed in the heavy-quark pair sectors of QCD, including two isospin multiplets in the b b-bar sector, Z_b(10610) and Z_b(10650), and one isospin multiplet in the c c-bar sector, Z_c(3900). We identify Z_b and Z_c as tetraquark mesons that are analogs of quarkonium hybrids with the gluon field replaced by an isospin-1 excitation of the...Go to contribution page
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Mr Ryan Berg (University of Saskatchewan)16/08/2013, 16:50QCD Physicsoral presentationWe use QCD Laplace sum-rules to predict ground state masses for $J^{PC}=0^{+-}$ and $J^{PC}=1^{--}$ strangeonium hybrids. In our calculations, we include contributions stemming from perturbation theory, 4d quark and gluon condensates, the 5d mixed condensate, and 6d quark and gluon condensates. These two $J^{PC}$-channels are of particular phenomenological interest as the Y(2175) has quantum...Go to contribution page
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