32 research outputs found

    Production of (τ+τ)b(\tau^+\tau^-)_b in electron positron collisions

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    (τ+τ)b(\tau^+\tau^-)_b is an atom of simple hydrogenlike structure similar to positronium (e+e)b(e^+e^-)_b and (μ+μ)b(\mu^+\mu^-)_b. In this paper energy levels and decay widths of different decay channels of (τ+τ)b(\tau^+\tau^-)_b are given. Cross section of production of this atomic system in e+ee^+e^- annihilation taking into account radiative corrections is calculated. According to our estimates 886 (τ+τ)b(\tau^+\tau^-)_b atoms may be produced at BEPCII and 29 (τ+τ)b(\tau^+\tau^-)_b atoms are produced at VEPP-4M under the present experimental conditions.Comment: 5 pages, submitted to Int. Jour. Mod. Phys.

    МОНТЕ-КАРЛО ГЕНЕРАТОР HEPComp ДЛЯ ДВУХФОТОННОГО РОЖДЕНИЯ ЛЕПТОННЫХ ПАР В АДРОННЫХ СТОЛКНОВЕНИЯХ

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    The processes of lepton pair production by means of the two-photon mechanism in hadron collisions at LHC and Tevatron energies are considered. These processes could be used for luminosity calibration of LHC and for a «new physics» search at the collider, in particular, heavy leptons. Constructing the needed Monte Carlo generator we have obtained total and differential cross sections of the above mentioned processes for elastic hadron scattering in natural approximation.Создан Монте-Карло генератор HEPComp для двухфотонного рождения лептонных пар в адронных столкновениях. Показано, что этот генератор событий правильно описывает рождение лептонных пар в двух-фотонном механизме. Генератор проверялся на экспериментальных данных Тэватрона, и с его помощью предсказаны полные и дифференциальные сечения для БАК

    ATLAS detector and physics performance: Technical Design Report, 1

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    Letter to professor H. Schopper

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    On Nuclear Reactor Antineutrino Spectra and Fluxes

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    New picture of neutrino mixing and masses explains the results of solar, atmospheric and reactor neutrino experiments. One sees the mixing of νe, νµ and ντ with 3 mass eigenstates νi . The obtained mass differences are in the mass region which is defined by known Λ-term from cosmology. Now neutrino from nuclear reactor together with neutrino from accelerators and radioactive sources are becoming a real driver of all elementary particle physics in searching the neutrinoless double beta decays and in investigation of oscillation phenomena. It is very useful instrument for searching new physics because of the fact that a nuclear reactors gives huge, isotropic and controllable flux of such unusual particles under investigation. Main obstacle to this program is poor knowledge of the energy spectra of reactor antineutrinos. It is related with difficulties of taking into account a large number of nuclear fragments, transforming into stable nuclei, in addition not all of these fragments have known characteristic
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