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High-Energy Elastic Hadron Scattering: Studies on the Direct and Inverse Problems

Grant number: 13/27060-3
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2014
Effective date (End): July 31, 2017
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal researcher:Marcio José Menon
Grantee:Paulo Victor Recchia Gomes da Silva
Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:09/50180-0 - Study of hadronic interactions at high energies, AP.TEM
Associated scholarship(s):15/21855-0 - High-energy elastic scattering and total cross sections: nonperturbative QCD aspects, BE.EP.DR


Experimental data on pp collisions from the CERN-LHC obtained in 2012 and 2013, provided important checks and developments of the Standard Model, including its strong (hadronic) sector. However, despite the novel experimental information and the successes of QCD as the theory of the strong interactions, the elastic hadron scattering still constitutes a great challenge for the QCD. In fact, as a soft scattering state (small momentum transfer / large distances) it is not formally accessed by perturbative approaches and currently a non perturbative formalism, from the first principles of QCD and independent of model assumptions is still lacking. In the phenomenological context, models are based on different physical pictures and depend on a rather large number of free parameters. Moreover, representative model predictions for the LHC energy region have shown no agreement with the new data on pp elastic collisions. It is expected that further data will provide important information for the necessary development on the soft strong interaction sector of QCD.In this context (experimental, theoretical and phenomenological), we propose a novel simultaneous investigation on both direct and inverse problems related to the pp elastic scattering. Based on recent empirical and theoretical results the main goals of the project are: (1) extraction of empirical information (laws/properties) on the physical quantities characterizing the elastic scattering as a function of both energy and transferred momentum in the collision; (2) to obtain the corresponding characteristics (analytical parametrizations) in the impact parameter and eikonal representations, specially in the momentum transfer space (the inverse problem); (3) to use this information to look for conections with non perturbative QCD results (functional methods, solutions of the Schwinger-Dyson equations and Lattice QCD); (4) by means of a feedback processes related to items (1) to (3), development of a non perturbative (QCD) formalism, with empirical basis and able to present satisfactory descriptions of the pp elastic scattering data (the direct problem), testing also extensions to single and double diffractive processes and other reactions (mesons-proton).

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Scientific publications (5)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FAGUNDES, D. A.; MENON, M. J.; SILVA, P. V. R. G. Leading components in forward elastic hadron scattering: Derivative dispersion relations and asymptotic uniqueness. International Journal of Modern Physics A, v. 32, n. 32 NOV 20 2017. Web of Science Citations: 5.
FAGUNDES, D. A.; MENON, M. J.; SILVA, P. V. R. G. Bounds on the rise of total cross section from LHC7 and LHC8 data. Nuclear Physics A, v. 966, p. 185-196, OCT 2017. Web of Science Citations: 8.
GIORDANO, M.; MEGGIOLARO, E.; SILVA, P. V. R. G. Investigation of the leading and subleading high-energy behavior of hadron-hadron total cross sections using a best-fit analysis of hadronic scattering data. Physical Review D, v. 96, n. 3 AUG 21 2017. Web of Science Citations: 1.
FAGUNDES, D. A.; JENKOVSZKY, L.; MIRANDA, E. Q.; PANCHERI, G.; SILVA, P. V. R. G. Fine structure of the diffraction cone: From the ISR to the LHC. International Journal of Modern Physics A, v. 31, n. 28-29, SI OCT 20 2016. Web of Science Citations: 7.
FAGUNDES, D. A.; MENON, M. J.; SILVA, P. V. R. G. Exploring central opacity and asymptotic scenarios in elastic hadron scattering. Nuclear Physics A, v. 946, p. 194-226, FEB 2016. Web of Science Citations: 9.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SILVA, Paulo Victor Recchia Gomes da. Análises fenomenológicas de seções de choque hadrônicas em energias altas e assintóticas. 2017. Doctoral Thesis - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin.

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