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Sep 23, 2013
09/13
Sep 23, 2013
by
Z. Conesa del Valle; G. Corcella; F. Fleuret; E. G. Ferreiro; V. Kartvelishvili; B. Z. Kopeliovich; J. P. Lansberg; C. Lourenço; G. Martinez; V. Papadimitriou; H. Satz; E. Scomparin; T. Ullrich; O. Teryaev; R. Vogt; J. X. Wang
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We present a brief overview of the most relevant current issues related to quarkonium production in high energy proton-proton and proton-nucleus collisions along with some perspectives. After reviewing recent experimental and theoretical results on quarkonium production in pp and pA collisions, we discuss the emerging field of polarisation studies. Thereafter, we report on issues related to heavy-quark production, both in pp and pA collisions, complemented by AA collisions. To put the work in a...
Source: http://arxiv.org/abs/1105.4545v1
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32
Sep 23, 2013
09/13
Sep 23, 2013
by
V. Kartvelishvili; A. V. Luchinsky; A. A. Novoselov
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Partial decay widths and branching fractions are calculated for the exclusive decays of the Standard Model Higgs boson into a pair of vector quarkonium states, $ H\to J/\psi J/\psi, H\to \Upsilon \Upsilon, H\to J/\psi \phi, H\to J/\psi \Upsilon$, with relativistic corrections due to quark motion in mesons taken into account.
Source: http://arxiv.org/abs/0810.0953v2
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34
Sep 22, 2013
09/13
Sep 22, 2013
by
V. Kartvelishvili; R. Kvatadze; R. Moller
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eye 34
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The influence of Bose-Einstein correlations on the determination of the mass of the W boson in e+e- -> WW -> 4jet events at LEP2 energies is studied, using a global event weighting method. We find that it is possible to keep the systematic error on the W mass from this source below 20 MeV, if suitable precautions are taken in the experimental analysis.
Source: http://arxiv.org/abs/hep-ph/9704424v2
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38
Sep 22, 2013
09/13
Sep 22, 2013
by
V. Kartvelishvili; R. Kvatadze
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eye 38
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The use of an unfolding procedure is proposed as an alternative method of extracting the $W$ boson mass from the data measured at LEP2, which may improve the accuracy of this measurement. The benefits of the direct unfolding method based on the Singular Value Decomposition of the response matrix are demonstrated on the example of W mass determination from the charged lepton energy spectra.
Source: http://arxiv.org/abs/hep-ph/9602257v1
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31
Sep 22, 2013
09/13
Sep 22, 2013
by
E. Chikovani; V. Kartvelishvili; R. Shanidze; G. Shaw; .
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We calculate the production cross-sections for the vector and pseudoscalar bound states of two gluinos. It is shown that existing and future colliders imply a realistic chance of observing gluinonium as a narrow peak in the two-jet invariant mass spectrum. With an integrated luminosity of 0.2 fb$^{-1}$ at the Tevatron, and the high efficiency for tagging heavy quark jets at CDF, one should be able to detect vector gluinonium for gluino masses up to about 170 GeV; or up to about 260 GeV for an...
Source: http://arxiv.org/abs/hep-ph/9602249v2
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39
Sep 22, 2013
09/13
Sep 22, 2013
by
V. Kartvelishvili; R. Kvatadze; R. Shanidze
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eye 39
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Z+jet production in heavy ion collisions at the LHC is proposed as a possible probe of the properties of the dense hadronic matter. It is shown that the accuracy of this measurement with general purpose LHC detectors and under realistic experimental conditions can be high enough. It is argued also that $Z$-boson production and subsequent leptonic decay is a good reference process for this measurement, as well as for the QCD process of high $P_T$ jet pair production.
Source: http://arxiv.org/abs/hep-ph/9505418v1
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33
Sep 21, 2013
09/13
Sep 21, 2013
by
V. Kartvelishvili; R. Kvatadze
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eye 33
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An event weighting method for simulating Bose-Einstein effects in hadronic final states is presented. The weight for an event depends on the momentum distribution of identical bosons in the event. By using a theoretically motivated parametrisation allowing weights below as well as above unity, the necessity of a weight-rescaling procedure is eliminated. A single parameter is used to adjust the average event weight to unity. Once adjusted, the same value of the parameter gives average event...
Source: http://arxiv.org/abs/hep-ph/0104314v1
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38
Sep 21, 2013
09/13
Sep 21, 2013
by
V. Kartvelishvili; M. Margvelashvili; G. Shaw
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eye 38
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Recent experimental data on tau decays are used to reconstruct the difference in hadronic spectral densities with vector and axial-vector quantum numbers. The saturation of Das-Mathur-Okubo and Weinberg sum rules is studied. Two methods of improving convergence and decreasing errors are applied, and good agreement with the predictions of current algebra and chiral perturbation theory is observed. The resulting value of the pion polarisability is (2.64 +/- 0.36) 10^-4 fm^3.
Source: http://arxiv.org/abs/hep-ph/9609424v1
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32
Sep 19, 2013
09/13
Sep 19, 2013
by
B. C. Allanach; J. J. van der Bij; A. Dedes; A. Djouadi; J. Grosse-Knetter; J. Hetherington; S. Heinemeyer; J. Holt; D. Hutchcroft; J. Kalinowski; G. Kane; V. Kartvelishvili; S. F. King; S. Lola; R. McNulty; M. A. Parker; G. D. Patel; G. G. Ross; M. Spira; P. Teixeira-Dias; G. Weiglein; G. Wilson; J. Womersley; P. Walker; B. R. Webber; T. Wyatt
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eye 32
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The Beyond the Standard Model Working Group discussed a variety of topics relating to exotic searches at current and future colliders, and the phenomenology of current models beyond the Standard Model. For example, various supersymmetric (SUSY) and extra dimensions search possibilities and constraints are presented. Fine-tuning implications of SUSY searches are derived. The implications of Higgs (non)-discovery are discussed, as well as the program HDECAY. The individual contributions are...
Source: http://arxiv.org/abs/hep-ph/9912302v3
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42
Sep 19, 2013
09/13
Sep 19, 2013
by
A. Ballestrero; D. G. Charlton; G. Cowan; P. Dornan; R. Edgecock; J. Ellis; E. W. N. Glover; C. Hawkes; H. Hwang; R. Jones; V. Kartvelishvili; Z. Kunszt; E. Maina; D. J. Miller; S. Moretti; A. Moutoussi; C. Parkes; P. B. Renton; D. A. Ross; W. J. Stirling; J. C. Thompson; M. Thomson; D. R. Ward; C. P. Ward; J. Ward; M. F. Watson; N. K. Watson; B. R. Webber
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The W Mass and QCD Working Group discussed a wide variety of topics relating to present and future measurements of M(W) at LEP2, including QCD backgrounds to W+W- production. Particular attention was focused on experimental issues concerning the direct reconstruction and threshold mass measurements, and on theoretical and experimental issues concerning the four jet final state. This report summarises the main conclusions.
Source: http://arxiv.org/abs/hep-ph/9709283v1
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37
Jul 20, 2013
07/13
Jul 20, 2013
by
V. Kartvelishvili; M. Margvelashvili
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eye 37
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Comparing the results of finite energy and Borel transformed sum rules for the difference of vector and axial vector current correlators we evaluate the instanton contributions to the $\tau$ hadronic width. In contrast to an explicit theoretical calculation we find that the instanton contributions to the $\tau$ hadronic width are much smaller than the standard nonperturbative corrections.
Source: http://arxiv.org/abs/hep-ph/9411417v1
