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Information × Registration Number 0221U104062, 0120U103570 , R & D reports Title Investigation of coherent effects in the interaction of high-energy particles with crystalline and amorphous targets and their use for diagnostics and control of beam parameters during precision experiments on CERN, LAL and GSI accelerators popup.stage_title Head Shulga Mykola F., Доктор фізико-математичних наук Registration Date 01-03-2021 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description2 Rep. on SRW: 45 pages., 15 fig., 29 ref. KEY WORDS: SCATTERING, QUANTUM SCATTERING CROSS-SECTION, THIN AND BENT CRYSTALS, DEFLECTION OF ANTIPROTONS, DARK PHOTON (DPH), KINETIC MELTING, TRIPLET-LIKE PROCESSES OBJECT OF RESEARCH – process of scattering of fast charged particles in straight thin and in bent crystals and photo lepton pairs creation of Standard Model at interaction of photons with high energy electrons or muons Aim: – calculation of quantum scattering cross-sections of positrons on thin Si crystals, which can be measured experimentally. Obtaining of optimal conditions for deflection of antiprotons in bent crystals. Search for DPh signal in processes of photo lepton pair creation on QED-background. Obtaining of limitations on DPh parameters. Research methods – numeric calculation of quantum scattering cross-section via wave function found by operator method. Numerical solution of equations of motion in external fields. Scanning of distribution over invariant mass square of lepton pair aimed to obtain a narrow resonance DPh signal. Quantum scattering cross-sections of positrons in the planar field of thin Si crystal are obtained as a function of energy, that can be used in experiment. It is shown that the axial orientation of bent crystal lets deflect antiprotons to much larger angles than the ones reached at planar orientation. The optimal value of crystal bending radius is obtained for deflection of 1 GeV-10 GeV antiprotons. An experiment is proposed basing on scanning of distribution at invariant mass of the created pair, a rule of event selection is formulated and the conditions are analyzed at which the manifestation of the DPh signal on QED background is optimal. The limitations to the DPh mass and on the intensity of its interaction with SM leptons are obtained for the considered processes at collection of events for the standard deviation equal to 2. The integral luminosity, needed for the event collection in the proposed experiment, is determined. Product Description popup.authors Hakh Hennadii I Kyryllin Igor V. Konchatnij Mikhailo I Merenkov Mykola P. Shul'ga Mykola F Shulga Sergii M. popup.nrat_date 2021-03-01 Close