71 research outputs found
Gluon Radiation in Production and Decay at the LHC
Understanding the pattern of gluon radiation in production and
decay processes is important for making an accurate determination of the top
mass from the momenta of its decay products. The larger energy of the LHC
collider boosts the top cross section by a factor of 100 compared to that at
the Tevatron, but it also increases the amount of additional gluon radiation.
We calculate the cross section for gluon radiation in top production and decay
at the LHC. The distributions of this radiation are presented and the exact
matrix-element results are compared with results from the HERWIG parton-shower
Monte Carlo.Comment: 16 pages including 7 figures, plain LaTeX; minor corrections to text;
results unchange
Top Quark Decays into Heavy Quark Mesons
For top quark decays into heavy quark mesons and , a
complete calculation to the leading order both in QCD coupling constant
and in , the typical velocity of the heavy quarks inside the
mesons, is performed. Relatons between the top quark mass and the decay
branching ratios are studied. Comparion with the results which are obtained by
using the quark frangmentation functions is also discussed. The branching
ratios are consistent (within a factor of ) with that obtained using
fragmentation functions at GeV.Comment: 15 pages in LaTex form, 4 figures include
NLO QCD corrections to hadronic Higgs production with heavy quarks
The production of a Higgs boson in association with a pair of top-antitop or
bottom-antibottom quarks plays a very important role at both the Tevatron and
the Large Hadron Collider. The theoretical prediction of the corresponding
cross sections has been improved by including the complete next-to-leading
order QCD corrections. After a brief description of the most relevant technical
aspects of the calculation, we review the results obtained for both the
Tevatron and the Large Hadron ColliderComment: 6 pages, 6 figures, espcrc2.sty. Talk given at the International
Conference QCD03, 2-7 July 2003, Montpellier, France. To be published in
Nucl. Phys. B Proc. Supp
Gluon Radiation in t\bar{t} Production at the Tevatron p\bar{p} Collider
We present a complete calculation of the matrix elements for the processes and which are
relevant for the study of events with an additional jet in
production at the Tevatron collider. Our calculation includes (i)
the contributions from gluons emitted during the top production and decay
stages and the interference between these, and (ii) the complete set of Feynman
diagrams corresponding to both resonant and non-resonant top production. We
study the distribution in phase space of the additional parton jet and make
comparisons with previous studies based on the soft-gluon approximation and
with results from parton-shower Monte Carlo simulations. The implications for
top mass measurements are briefly discussed.Comment: 12 pages, latex, 9 uuencoded postscript figure
The contribution of the four-parton final states to gamma* gamma* -> hadrons
In the analysis of the total cross section for the gamma* gamma* -> hadrons
process, we include the four parton final states, which are part of the
O(alpha_s^2) corrections. The four-parton final states contain the diagrams
with gluon exchange in the crossed channel, which constitute the leading order
of the BFKL resummation. We show that the diagrams with gluon exchange in the
crossed channel play an important role in the large Y region, however their
contribution to the cross section must be evaluated exactly. In fact, the
high-energy limit, which constitutes the kinematic framework of the BFKL
resummation, is not sufficiently accurate at LEP2 energies. The inclusion of
the diagrams with gluon exchange in the crossed channel reduces the discrepancy
between the theory and the LEP2 data collected by the L3 Collaboration, but the
data still lie above the theory, even allowing for a large scale uncertainty in
the theory. Thus, in order to describe accurately the data for gamma* gamma* ->
hadrons in the large Y region, corrections of an order higher than O(alpha_s^2)
seem to be necessary.Comment: 32 pages, 10 figures, published versio
Jet-jet and hadron-jet correlations in hadro- and electro-production
We discuss, in the framework of perturbative QCD at next to leading order,
two related observables which are usually considered to provide tests of the
BFKL dynamics : jet-jet correlations at Tevatron energies and forward
particle-jet correlations at HERA. In the first case we study the rapidity gap
dependence of the azimuthal correlations and find slightly too strong
correlations at large gap. In the second case we discuss the cross section as
well as the azimuthal correlations over a rapidity gap range of 5 units. We
find that the requirement of a forward particle imposes strong kinematical
constraints which distort the distributions, notably at small rapidity gaps. We
also show that the decorrelation is stronger in electroproduction than in
hadron-hadron collisions. Unfortunately no data are yet available for
comparison.Comment: LaTeX, 19 pages, 7 figures (9 figure files
Top Quark Physics
We review the prospects for studies of the top quark at the LHC.We review the prospects for studies of the top quark at the LHC. Members of the working group who have contributed to this document are: A.Ahmadov, G.Azuelos, U.Baur, A.Belyaev, E.L.Berger, W.Bernreuther, E.E.Boos, M.Bosman, A.Brandenburg, R.Brock, M.Buice, N.Cartiglia, F.Cerutti, A.Cheplakov, L.Chikovani, M.Cobal-Grassmann, G.Corcella, F.del Aguila, T.Djobava, J.Dodd, V.Drollinger, A.Dubak, S.Frixione, D.Froidevaux, B.Gonzalez Pineiro, Y.P.Gouz, D.Green, P.Grenier, S.Heinemeyer, W.Hollik, V.Ilyin, C.Kao, A.Kharchilava, R. Kinnunen, V.V.Kukhtin, S.Kunori, L.La Rotonda, A.Lagatta, M.Lefebvre, K.Maeshima, G.Mahlon, S.Mc Grath, G.Medin, R.Mehdiyev, B.Mele, Z.Metreveli, D.O'Neil, L.H.Orr, D.Pallin, S.Parke, J.Parsons, D.Popovic, L.Reina, E.Richter-Was, T.G.Rizzo, D.Salihagic, M.Sapinski, M.H.Seymour, V.Simak, L.Simic, G.Skoro, S.R.Slabospitsky, J.Smolik, L.Sonnenschein, T.Stelzer, N.Stepanov, Z.Sullivan, T.Tait, I.Vichou, R.Vidal, D.Wackeroth, G.Weiglein, S.Willenbrock, W.W
Representational predicaments for employees: Their impact on perceptions of supervisors\u27 individualized consideration and on employee job satisfaction
A representational predicament for a subordinate vis-à -vis his or her immediate superior involves perceptual incongruence with the superior about the subordinate\u27s work or work context, with unfavourable implications for the employee. An instrument to measure the incidence of two types of representational predicament, being neglected and negative slanting, was developed and then validated through an initial survey of 327 employees. A subsequent substantive survey with a fresh sample of 330 employees largely supported a conceptual model linking being neglected and negative slanting to perceptions of low individualized consideration by superiors and to low overall job satisfaction. The respondents in both surveys were all Hong Kong Chinese. Two case examples drawn from qualitative interviews illustrate and support the conceptual model. Based on the research findings, we recommend some practical exercises to use in training interventions with leaders and subordinates. © 2013 Copyright Taylor and Francis Group, LLC
Linear Collider Physics Resource Book for Snowmass 2001, 3: Studies of Exotic and Standard Model Physics
This Resource Book reviews the physics opportunities of a next-generation e+e- linear collider and discusses options for the experimental program. Part 3 reviews the possible experiments on that can be done at a linear collider on strongly coupled electroweak symmetry breaking, exotic particles, and extra dimensions, and on the top quark, QCD, and two-photon physics. It also discusses the improved precision electroweak measurements that this collider will make available.This Resource Book reviews the physics opportunities of a next-generation e+e- linear collider and discusses options for the experimental program. Part 3 reviews the possible experiments on that can be done at a linear collider on strongly coupled electroweak symmetry breaking, exotic particles, and extra dimensions, and on the top quark, QCD, and two-photon physics. It also discusses the improved precision electroweak measurements that this collider will make available
Measurement of the cross section for isolated-photon plus jet production in pp collisions at âs=13 TeV using the ATLAS detector
The dynamics of isolated-photon production in association with a jet in protonâproton collisions at a centre-of-mass energy of 13 TeV are studied with the ATLAS detector at the LHC using a dataset with an integrated luminosity of 3.2 fbâ1. Photons are required to have transverse energies above 125 GeV. Jets are identified using the anti- algorithm with radius parameter and required to have transverse momenta above 100 GeV. Measurements of isolated-photon plus jet cross sections are presented as functions of the leading-photon transverse energy, the leading-jet transverse momentum, the azimuthal angular separation between the photon and the jet, the photonâjet invariant mass and the scattering angle in the photonâjet centre-of-mass system. Tree-level plus parton-shower predictions from Sherpa and Pythia as well as next-to-leading-order QCD predictions from Jetphox and Sherpa are compared to the measurements
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