2019, Chetvertkova, V. A., Kalugin, N. K., Ladygin, V. P., Bogdanov, A. A., Mochalov, V. V., Nurusheva, M. B., Okorokov, V. A., Semenov, P. A., Vasiliev, A. N., Zherebtsova, L. S., Богданов, Алексей Александрович, Мочалов, Василий Вадимович, Нурушева, Марина Борисовна, Окороков, Виталий Алексеевич, Семенов, Павел Александрович, Васильев, Александр Николаевич

© Published under licence by IOP Publishing Ltd.Newly developing SPASCHARM (SPin Asymmetry in CHARMonia) experiment at U70 accelerator will give the unique possibility to measure spin effects with the use of polarized proton and antiproton beams and polarized target. We suggest to carry out the measurements of the pp and p(bar)p elastic scattering spin observables at 16 GeV/c (direct reconstruction of elastic pp and p(bar)p elastic scattering amplitudes at SPASCHARM experiment). To date the direct reconstruction of amplitudes for pp elastic scattering was performed up to 6 GeV/c only, meanwhile there is no available data for p(bar)p elastics scattering. New measurements at SPASCHARM will significantly extend the energy range of the spin studies and will give unique possibility to compare elastic pp and p(bar5)p scattering.

2020, Chetvertkova, V. A., Kozelov, A. V., Ladygin, V. P., Bogdanov, A. A., Mochalov, V. V., Nurusheva, M. B., Okorokov, V. A., Oreshkov, A. O., Rykov, V. L., Semenov, P. A., Vasiliev, A. N., Богданов, Алексей Александрович, Мочалов, Василий Вадимович, Нурушева, Марина Борисовна, Окороков, Виталий Алексеевич, Рыков, Владимир Львович, Семенов, Павел Александрович, Васильев, Александр Николаевич

© Published under licence by IOP Publishing Ltd.The direct reconstruction of the pp elastic scattering amplitudes at the energy of 16 GeV is discussed. At the SPASCHARM experiment, the 19 different spin dependent observables will be measured in pp elastic scattering. The suggested selection of observables allows a complete analytical reconstruction of elastic scattering amplitudes as a solution of the system of bilinear equations. A set of physical observables, which are necessary for model independent reconstruction of all five complex elastic pp scattering amplitudes, is defined.

2020, Chetvertkova, V. A., Kozelov, A. V., Ladygin, V. P., Bogdanov, A. A., Mochalov, V. V., Nurusheva, M. B., Okorokov, V. A., Runtso, M. F., Vasiliev, A. N., Богданов, Алексей Александрович, Мочалов, Василий Вадимович, Нурушева, Марина Борисовна, Окороков, Виталий Алексеевич, Васильев, Александр Николаевич

© 2020 Published under licence by IOP Publishing Ltd.The direct reconstruction of pp elastic scattering amplitudes at the SPASCHARM experiment is discussed. The observables are expressed in terms of invariant amplitudes. These amplitudes are deduced analytically by solving bilinear relations. Monte-Carlo simulations of elastic scattering as well background reactions were carried out. Elastic and diffraction interactions of protons were simulated by using PYTHIA generator for 16 GeV incident protons, designed Setup geometry and the resolution of the detectors. The criteria to select elastic processes are discussed and presented. Two-dimensional distributions of the product of the tangents of the polar angles of the recoil particle and the scattered particle versus difference of the azimuth angles of these particles, were obtained. The estimated ratio of the signal to background S/(S+B) is about 0.99.