Feasibility studies for the measurement of time-like proton electromagnetic form factors from (p)over-barp -> mu(+)mu(-) at PANDA at FAIR

Kozela, Adam/0000-0002-3286-4933; Wronka, Slawomir/0000-0003-3277-138X; Mochalov, Vasilii/0000-0002-5752-5807; Filo, Grzegorz/0000-0003-0848-6124; Szczurek, Antoni/0000-0001-5247-8442; Kantsyrev, Alexey V/0000-0001-5301-5597; Widmann, Eberhard/0000-0003-0486-6023; Yilmaz, Ali/0000-0001-5963-8306; Barnyakov, Alexander/0000-0002-8556-6622; Bracco, Gianangelo/0000-0002-0055-5802; Moskal, Pawel/0000-0002-4229-3548; Davi, Fabrizio/0000-0002-8146-7715; Novotny, Radek/0000-0002-1630-694X; Schmidt, Mustafa/0000-0002-4467-2461 This paper reports on Monte Carlo simulation results for future measurements of the moduli of time-like proton electromagnetic form factors, vertical bar G(E)vertical bar and vertical bar G(M)vertical bar, using the (p) over barp -> mu(+)mu(-) reaction at PANDA (FAIR). The electromagnetic form factors are fundamental quantities parameterizing the electric and magnetic structure of hadrons. This work estimates the statistical and total accuracy with which the form factors can be measured at PANDA, using an analysis of simulated data within the PandaRoot software framework. The most crucial background channel is (p) over barp -> pi(+)pi(-), due to the very similar behavior of muons and pions in the detector. The suppression factors are evaluated for this and all other relevant background channels at different values of antiproton beam momentum. The signal/background separation is based on a multivariate analysis, using the Boosted Decision Trees method. An expected background subtraction is included in this study, based on realistic angular distributions of the background contribution. Systematic uncertainties are considered and the relative total uncertainties of the form factor measurements are presented. Science and Technology Facilities Council (STFC), British funding agency, Great BritainUK Research & Innovation (UKRI)Science & Technology Facilities Council (STFC); Bhabha Atomic Research Centre (BARC), India; Indian Institute of Technology Bombay, India; Bundesministerium fur Bildung und Forschung (BMBF), GermanyFederal Ministry of Education & Research (BMBF); Carl-Zeiss-Stiftung, Mainz, Germany [21-0563-2.8/122/1, 21-0563-2.8/131/1]; Center for Advanced Radiation Technology (KVI-CART), Groningen, Netherlands; CNRS/IN2P3, FranceCentre National de la Recherche Scientifique (CNRS); Universite Paris-Sud, France; Czech Ministry (MEYS), Germany [LM2015049, CZ.02.1.01/0.0/0.0/16, 013/0001677]; Deutsche Forschungsgemeinschaft (DFG), GermanyGerman Research Foundation (DFG); Deutscher Akademischer Austauschdienst (DAAD), GermanyDeutscher Akademischer Austausch Dienst (DAAD); Forschungszentrum Julich, Germany; European Union's Horizon 2020 research and innovation program [824093]; Gesellschaft fur Schwerionenforschung GmbH (GSI), Darmstadt, GermanyHelmholtz Association; Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF), Germany; INTAS, European Commission funding; Institute of High Energy Physics (IHEP), Beijing, China; Chinese Academy of Sciences, Beijing, ChinaChinese Academy of Sciences; Istituto Nazionale di Fisica Nucleare (INFN), ItalyIstituto Nazionale di Fisica Nucleare (INFN); Ministerio de Educacion y Ciencia (MEC)Spanish GovernmentEuropean Commission [FPA2006-12120-C03-02]; Polish Ministry of Science and Higher Education (MNiSW), PolandMinistry of Science and Higher Education, Poland [2593/7, PR UE/2012/2]; National Science Centre (NCN), PolandNational Science Centre, Poland [DEC-2013/09/N/ST2/02180]; State Atomic Energy Corporation Rosatom, National Research Center Kurchatov Institute, Russia; Schweizerischer Nationalfonds zur Forderung der Wissenschaftlichen Forschung (SNF), Swiss; Stefan Meyer Institut fur Subatomare Physik, Austria; osterreichische Akademie der Wissenschaften, Wien, Austria; Swedish Research Council, SwedenSwedish Research Council; Knut and Alice Wallenberg Foundation, SwedenKnut & Alice Wallenberg Foundation; Scientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [119F094] We acknowledge financial support from the Science and Technology Facilities Council (STFC), British funding agency, Great Britain; the Bhabha Atomic Research Centre (BARC) and the Indian Institute of Technology Bombay, India; the Bundesministerium fur Bildung und Forschung (BMBF), Germany; the Carl-Zeiss-Stiftung 21-0563-2.8/122/1 and 21-0563-2.8/131/1, Mainz, Germany; the Center for Advanced Radiation Technology (KVI-CART), Groningen, Netherlands; the CNRS/IN2P3 and the Universite Paris-Sud, France; the Czech Ministry (MEYS) Grants LM2015049, CZ.02.1.01/0.0/0.0/16 and 013/0001677, the Deutsche Forschungsgemeinschaft (DFG), Germany; the Deutscher Akademischer Austauschdienst (DAAD), Germany; the Forschungszentrum Julich, Germany; the European Union's Horizon 2020 research and innovation program under grant agreement No 824093; the Gesellschaft fur Schwerionenforschung GmbH (GSI), Darmstadt, Germany; the Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF), Germany; the INTAS, European Commission funding; the Institute of High Energy Physics (IHEP) and the Chinese Academy of Sciences, Beijing, China; the Istituto Nazionale di Fisica Nucleare (INFN), Italy; the Ministerio de Educacion y Ciencia (MEC) under Grant FPA2006-12120-C03-02; the Polish Ministry of Science and Higher Education (MNiSW) Grant No. 2593/7, PR UE/2012/2, and the National Science Centre (NCN) DEC-2013/09/N/ST2/02180, Poland; the State Atomic Energy Corporation Rosatom, National Research Center Kurchatov Institute, Russia; the Schweizerischer Nationalfonds zur Forderung der Wissenschaftlichen Forschung (SNF), Swiss; the Stefan Meyer Institut fur Subatomare Physik and the osterreichische Akademie der Wissenschaften, Wien, Austria; the Swedish Research Council and the Knut and Alice Wallenberg Foundation, Sweden; the Scientific and Technological Research Council of Turkey (TUBITAK) under Grant No. 119F094.