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Registration Number

0215U003169, 0114U002899 , R & D reports

Title

Theoretical studies of the physical processes at the LHC and other accelarators at high energies

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Head

Korchin Alexander Yur'evich,

Registration Date

23-01-2015

Organization

National Science Center "Kharkiv Institute of Physics and Technology

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The interpretation of experimental data ATLAS, CMS and LHCb is given with the help of calculations which provide consistent inclusion of the contributions of perturbation theory in quantum chromodynamics beyond the leading order for p p -> mu + mu- n jet X (n = 0,1,2) and gluon emission from quarks in the initial and final states. It is shown that the results of simulation of the processes of creation of Z-boson, virtual gamma-quanta and jets depend essentially on account of multiple scattering of partons. The predictions are obtained for the correlation observables, which can be measured in experiments at the LHC. The kinematic conditions, in which new data of ALICE and LHCb at large values of Z/gamma* rapidity will be useful for testing the underlying models in the theory of distributions of quarks and gluons in the proton, are found. The contributions from the processes B0 -> K * 0 V -> K- pi + V with vector mesons V, which decay into mu + mu- pairs in the CP-average and CP-asymmetric coefficients of the angular distribution of the process B0 -> K- pi + mu + mu-, induced by the neutral current which changes the flavor of quarks, are analyzed. The most general form of the effective Hamiltonian of the weak interaction, which contains scalar, pseudoscalar, vector, axial-vector and tensor operators, is used to describe the transition b -> s mu + mu-. This Hamiltonian is an extension of the Hamiltonian of the Standard Model (SM). Expressions are obtained for the amplitudes for decay with the non-resonant amplitudes that depend on the Wilson coefficients of the effective Hamiltonian, and the resonance amplitudes, associated with intermediate vector mesons, as well as for all CP-average and CP-asymmetric angular distribution coefficients, and some linear combination of these coefficients. Predictions for the observables for the decay in the framework of the SM and scenario of new physics, which includes tensor operators, are made. The results, obtained at this stage, are topical. They are directly related with the experiments that are performed by the collaborations ALICE, ATLAS, CMS and LHCb at the LHC.

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Івашин Сергій Анатолійович
Ісаєв Олександр Олексійович
Ковальчук Володимир Анатолійович
Котляр Володимир Вікторович

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2020-04-02