********************************************************************** GAUSTEQ Germany and U.S. Nuclear Theory Exchange Program for QCD Studies of Hadrons and Nuclei *************************** VISITOR REPORT *************************** Please use the following template to prepare your report in plain text format. Short, itemized answers are preferred. Send your report by E-mail to (as an attachment to preserve formating). ---------------------------------------------------------------------- 1) NAME AND HOME INSTITUTION OF TRAVELER (INCL. E-MAIL ADDRESS) Name: Igor Danilkin Institution: Jefferson Lab email: danilkin@jlab.org ---------------------------------------------------------------------- 2) POSITION OF TRAVELER (FACULTY/STAFF/POSTDOC/STUDENT) postdoc ---------------------------------------------------------------------- 3) DATES OF TRAVEL March 27 - April 06, 2015 ---------------------------------------------------------------------- 4) INSTITUTIONS VISITED (LIST PLACES AND TIME SPENT THERE) Johannes Gutenberg-Universität Mainz: 9 days ---------------------------------------------------------------------- 5) SCIENTIFIC CONTACTS AND COLLABORATORS (INDICATE NATURE OF CONTACTS, LIKE "NEW COLLABORATION," "CONTINUING COLLABORATION," "USEFUL DISCUSSION," ETC.) Marc Vanderhaeghen “new collaboration” Vladyslav Pauk "useful discussion" Pere Masjuan “useful discussion” ---------------------------------------------------------------------- 6) TOPICS DISCUSSED DURING VISIT * light-by-light sum rules * virtual photon-photon scattering * decays of light mesons and hadron spectroscopy ---------------------------------------------------------------------- 7) IMPACT ON TRAVELER'S OR HOST'S RESEARCH (INCL. EXPECTED PUBLICATIONS) Two new projects were initiated with Prof. Marc Vanderhaeghen related to light-by-light sum rules and muon anomalous magnetic moment. The first estimate of gamma gamma-> 4pi (which is predominantly gamma gamma ->rho rho) has been performed. Next step would be imposing virtuality on one of the photon. In addition we discussed the application of the sum rules in charmonium sector. ---------------------------------------------------------------------- 8) RELEVANCE TO JEFFERSON LAB OR GSI-FAIR (LIST RELEVANT PROGRAMS) Initiated projects are relevant both for JLab and FAIR experiments. In particularly, the light-by-light sum rules in charmonium sector can indicate to what extend the lowest lying states saturate this sum rule and therefore can constrain the contribution of the states above the open-charm threshold. This topic is relevant for future PANDA experiment. The analysis of muon anomalous magnetic moment will benefit from low energy experiments at JLab such as the eta radiative decay width from Primakoff process (E-10-011). ---------------------------------------------------------------------- 9) SUGGESTIONS/RECOMMENDATIONS FOR PROGRAM ADMINISTRATORS (IF ANY) ---------------------------------------------------------------------- 10) SUPPORT PROVIDED BY HOSTS (INDICATE TYPE AND EXTENT OF SUPPORT, NOT EXACT AMOUNTS) None ---------------------------------------------------------------------- 11) ACKNOWLEDGMENTS Please acknowledge support from the GAUSTEQ program in any publication benefiting from the results of your visit, by including the following text in your acknowledgments: "This work was supported partially through GAUSTEQ (Germany and U.S. Nuclear Theory Exchange Program for QCD Studies of Hadrons and Nuclei) under contract number DE-SC0006758." ---------------------------------------------------------------------- updated: Nov. 2011 **********************************************************************