621 research outputs found

    Summary of the Activities of the Working Group I on High Energy and Collider Physics

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    This is a summary of the projects undertaken by the Working Group I on High Energy Collider Physics at the Eighth Workshop on High Energy Physics Phenomenology (WHEPP8) held at the Indian Institute of Technology, Mumbai, January 5-16, 2004. The topics covered are (i) Higgs searches (ii) supersymmetry searches (iii) extra dimensions and (iv) linear collider.Comment: summary of Working Group I at the Eighth Workshop on High Energy Physics Phenomenology (WHEPP8), I.I.T., Mumbai, January 5-16, 200

    Dilepton distributions at backward rapidities

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    The dilepton production at backward rapidities in pAupAu and pppp collisions at RHIC and LHC energies is investigated in the dipole approach. The results are shown through the nuclear modification ratio RpAR_{pA} considering transverse momentum and rapidity spectra. The dilepton modification ratio presents interesting behavior at the backward rapidities when compared with the already known forward ones, since it is related with the large xx kinematical region that is being probed. The rapidity dependence of the nuclear modification ratio in the dilepton production is strongly dependent on the Bjorken xx behavior of the nuclear structure function ratio RF2=F2A/F2pR_{F_{2}}=F_{2}^{A}/F_{2}^{p}. The RpAR_{pA} transverse momentum dependence at backward rapidities is modified due to the large xx nuclear effects: at RHIC energies, for instance, the ratio RpAR_{pA} is reduced as pTp_T increases, presenting an opposite behavior when compared with the forward one. It implies that the dilepton production at backward rapidities should carry information of the nuclear effects at large Bjorken xx, as well as that it is useful to investigate the pTp_T dependence of the observables in this kinematical regime.Comment: 15 pages, 6 figures. Version published in the Phys. Rev.

    Astrophysical constraints on superlight gravitinos

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    I review the constraints on the mass of gravitinos that follow from considerations on energy loss in stars and from Big Bang Nucleosynthesis arguments.Comment: Invited talk at the 5th Workshop on High Energy Physics Phenomenology(WHEPP-5), Pune, India, 12-26 January 199

    Non-Minimal and Non-Universal Supersymmetry

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    I motivate and discuss non-minimal and non-universal models of supersymmetry and supergravity consistent with string unification at 101610^{16} GeV.Comment: 10 pages, Latex. Plenary talk given at 6th Workshop in High Energy Physics Phenomenology (WHEPP 6), Chennai (Madras), India, 3-15 Jan 200

    Status of Electroweak Phase Transition and Baryogenesis

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    I review recent progress on the electroweak phase transition and baryogenesis, focusing on the minimal supersymmetric standard model as the source of new physics.Comment: 10 pp, 6 figures; plenary talk given at 6th Workshop on High Energy Physics Phenomenology, 4 Jan. 2000, Chennai, India. v.2: added reference

    Physics Possibilities at a Linear Collider

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    We review some recent studies about the parameter determination of top quarks, W bosons, Higgs bosons, supersymmetric particles and in the ADD model of extra dimensions at a linear collider.Comment: 16 pages, LaTeX, 9 eps figures, invited plenary talk presented by A. Bartl at the "Workshop on High Energy Physics Phenomenology (WHEPP-8)", Indian Institute of Technology, Mumbai, January 5 - 16, 200

    Constraints on msm_s and ϵ/ϵ\epsilon'/\epsilon from Lattice QCD

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    Results for light quark masses obtained from lattice QCD simulations are compared and contrasted with other determinations. Relevance of these results to estimates of ϵ/ϵ\epsilon'/\epsilon is discussed.Comment: Latex, 7 pages, 2 figures. Invited talk presented at the Workshop on High Energy Physics Phenomenology ``WHEPP-6'', 3-15 January 2000, Institute of Mathematical Sciences, Chennai, India. To appear in the proceeding
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