1,353 research outputs found

    Numerical modeling of stimulation of induced magnetosphere during interaction of solar wind with the ionosphere of Venus

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    Electrodynamic processes in the ionopause are examined as well as the structure of the induced magnetosphere

    Effective action for reggeized gluons, classical gluon field of relativistic color charge and color glass condensate approach

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    We discuss application of formalism of small-xx effective action for reggeized gluons, \cite{Gribov,LipatovEff,BFKL}, for the calculation of classical gluon field of relativistic color charge, similarly to that done in CGC approach of \cite{Venug,Kovner}. The equations of motion with the reggeon fields are solved in LO and NLO approximations and new solutions are found. The results are compared to the calculations performed in the CGC framework and it is demonstrated that the LO CGC results for the classical field are reproduced in our calculations. Possible applications of the NLO solution in the effective action and CGC frameworks are discussed as well.Comment: 15 page

    Prompt ηc\eta_c meson production at the LHC in the NRQCD with kTk_T-factorization

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    In the framework of the kTk_T-factorization, the prompt production of ηc\eta_c mesons at the LHC conditions is studied. Our consideration is based on the off-shell amplitudes for hard partonic subprocesses and on the nonrelativistic QCD (NRQCD) formalism for the formation of bound states. We try two latest parametrizations for noncollinear, or transverse momentum dependent (TMD) gluon densities derived from the Catani-Ciafaloni-Fiorani-Marchesini (CCFM) equation. We use the values of the nonperturbative matrix elements obtained from a combined fit of the ηc\eta_c and J/ψJ/\psi differential cross sections. Finally, we show an universal set of parameters that provides a reasonable simultaneous description for all of the available data on the prompt J/ψJ/\psi and ηc\eta_c production at the LHC.Comment: 5 pages, 2 figures, 3 table

    Prompt charmonia production and polarization at LHC in the NRQCD with kTk_T-factorization. Part III: J/ψJ/\psi meson

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    In the framework of kTk_T-factorization approach, the production and polarization of prompt J/ψJ/\psi mesons at the LHC energies is studied. Our consideration is based on the non-relativistic QCD formalism for bound states and off-shell amplitudes for hard partonic subprocesses. Both the direct production mechanism and feed-down contributions from χc\chi_c and ψ(2S)\psi(2S) decays are taken into account. The transverse momentum dependent (or unintegrated) gluon densities in a proton were derived from Ciafaloni-Catani-Fiorani-Marchesini evolution equation or, alternatively, were chosen in accordance with Kimber-Martin-Ryskin prescription. The non-perturbative color-octet matrix elements were first deduced from the fits to the latest CMS data on J/ψJ/\psi transverse momentum distributions and then applied to describe the ATLAS and LHCb data on J/ψJ/\psi production and polarization at s=7\sqrt s = 7, 88 and 1313 TeV. We perform an estimation of polarization parameters λθ\lambda_\theta, λϕ\lambda_\phi and λθϕ\lambda_{\theta \phi} which determine J/ψJ/\psi spin density matrix and demonstrate that treating the soft gluon emission as a series of explicit color-electric dipole transitions within NRQCD leads to unpolarized J/ψJ/\psi production at high transverse momenta, that is in qualitative agreement with the LHC data.Comment: 23 pages, 14 figures. arXiv admin note: substantial text overlap with arXiv:1508.0548

    First estimates of the BcB_c wave function from the data on the BcB_c production cross section

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    In the framework of perturbative QCD and nonrelativistic bound state formalism, we calculate the production of BcB_c and BcB_c^* mesons at the conditions of the CDF and LHCb experiments. We derive first estimations for the BcB_c wave function from a comparison with the available data.Comment: 3 pages, 1 figur

    Effective action for the Regge processes in gravity

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    It is shown, that the effective action for the reggeized graviton interactions can be formulated in terms of the reggeon fields A++A^{++} and AA^{--} and the metric tensor gμνg_{\mu \nu} in such a way, that it is local in the rapidity space and has the property of general covariance. The corresponding effective currents jj^{-} and j+j^{+} satisfy the Hamilton-Jacobi equation for a massless particle moving in the gravitational field. These currents are calculated explicitly for the shock wave-like fields and a variation principle for them is formulated. As an application, we reproduce the effective lagrangian for the multi-regge processes in gravity together with the graviton Regge trajectory in the leading logarithmic approximation with taking into account supersymmetric contributions.Comment: 39 page

    One loop light-cone QCD, effective action for reggeized gluons and QCD RFT calculus

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    The effective action for reggeized gluons is based on the gluodynamic Yang-Mills Lagrangian with external current for longitudinal gluons added, see [1]. On the base of classical solutions, obtained in [2], the one-loop corrections to this effective action in light-cone gauge are calculated. The RFT calculus for reggeized gluons similarly to the RFT introduced in [3] is proposed and discussed. The correctness of the results is verified by calculation of the propagator of A+A_{+} and AA_{-} reggeized gluons fields and application of the obtained results is discussed as well.Comment: 24 page

    Analytic properties of high energy production amplitudes in N=4 SUSY

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    We investigate analytic properties of the six point planar amplitude in N=4 SUSY at the multi-Regge kinematics for final state particles. For inelastic processes the Steinmann relations play an important role because they give a possibility to fix the phase structure of the Regge pole and Mandelstam cut contributions. These contributions have the Moebius invariant form in the transverse momentum subspace. The analyticity and factorization constraints allow us to reproduce the two-loop correction to the 6-point BDS amplitude in N=4 SUSY obtained earlier in the leading logarithmic approximation with the use of the s-channel unitarity. The exponentiation hypothesis for the remainder function in the multi-Regge kinematics is also investigated. The 6-point amplitude in LLA can be completely reproduced from the BDS ansatz with the use of the analyticity and Regge factorization.Comment: To appear in the proceedings of 16th International Seminar on High Energy Physics, QUARKS-2010, Kolomna, Russia, 6-12 June, 2010. 15 page

    Particle Event Generator: A Simple-in-Use System PEGASUS version 1.0

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    PEGASUS is a parton-level Monte-Carlo event generator designed to calculate cross sections for a wide range of hard QCD processes at high energy pppp and ppˉp\bar p collisions, which incorporates the dynamics of transverse momentum dependent (TMD) parton distributions in a proton. Being supplemented with off-shell production amplitudes for a number of partonic subprocesses and provided with necessary TMD gluon density functions, it produces weighted or unweighted event records which can be saved as a plain data file or a file in a commonly used Les Houches Event format. A distinctive feature of PEGASUS is an intuitive and extremely user friendly interface, allowing one to easily implement various kinematical cuts into the calculations. Results can be also presented "on the fly" with built-in tool \textsc{pegasus plotter}. A short theoretical basis is presented and detailed program description is given.Comment: 24 pages, 8 figure

    Non-forward NLO BFKL Kernel

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    Details of the calculation of the non-forward BFKL kernel at next-to-leading order (NLO) are offered. Specifically we show the calculation of the two-gluon production contribution. This contribution was the last missing part of the kernel. Together with the NLO gluon Regge trajectory, the NLO contribution of one-gluon production and the contribution of quark-antiquark production which were found before it defines the kernel completely for any colour state in the tt-channel, in particular the Pomeron kernel presented recently.Comment: 31 page
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