1. Institute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia
2. BLTP, Joint Institute for Nuclear Research, Dubna, Russia
3. Institute of Physics, Faculty of Sciences, P.J. Safarik University, Park Angelinum 9, 041 54 Košice, Slovakia
4. 'Peoples' Friendship University of Russia (RUDN University) 6 Miklukho-Maklaya St, Moscow, 117198, Russian Federation
5. Department of Theoretical Physics, St. Petersburg University, Ulyanovskaya 1, St. Petersburg, Petrodvorets, 198504 Russia