Department of Experimental Particle Physics and Applications

dr Barłomiej Łach

current position: postdoctoral researcher at Jagiellonian University, Poland

Experimental determination of the Dalitz plot for positronium decay using the J-PET detection system
M. Skurzok, S.D. Bass, K. Kasperska, E.Y. Beyene, N. Chug, C. Curceanu, E. Czerwiński, M. Das, M. Gorgol, S. Jalali, B. Jasińska, K. Kacprzak, T. Kaplanoglu, Ł. Kapłon, A. Khreptak, T. Kozik, K. Kubat, D. Kumar, S.K. Kundu, E. Lisowski, F. Lisowski, B. Łach, J. Mędrala-Sowa, S. Moyo, W. Mryka, S. Niedźwiecki, A. Pandey, P. Pandey, A. Porcelli, B. Rachwał, M. Rädler, S. Sharma, E.Ł. Stępień, T. Szumlak, P. Tanty, K. Tayefi Ardebili, S. Tiwari, K. V. Eliyan, A. K. Venadan, P. Moskal
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abstract
Phys. Lett. B, in press

We present the first measurements of the Dalitz plot for ortho-positronium annihilation to three photons. Our measurements, accurate to about 3% statistical and 2-3% systematic uncertainty in angular representation over almost the entire available phase space, were performed using the Jagiellonian Positron Emission Tomograph (J-PET) based on organic scintillator strips. Until now, the Dalitz plot for the three-body positronium decay has been poorly explored. The new measurements presented here are consistent with the leading-order QED prediction for the Dalitz plot.