Naslov
New Insight in the Q2 Dependence of Proton Generalized Polarizabilities

Autori
Beričič, J. ; ... ; Bosnar, Damir ; ... Friščić, Ivica ; ... ; Makek, Mihael ; ... ; Weinriefer, M. ;

Kolaboracija
A1 Collaboration

Izvornik
Physical Review Letters (0031-9007) 123 (2019), 19; 192302, 5

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Virtual Compton Scattering, VCS, Proton Polarizability, MAMI

Sažetak
Virtual Compton scattering on the proton has been investigated at three yet unexplored values of the four-momentum transfer Q2: 0.10, 0.20 and 0.45 GeV2, at the Mainz Microtron. Fits performed using either the low-energy theorem or dispersion relations allowed the extraction of the structure functions PLL−PTT/ϵ and PLT, as well as the electric and magnetic generalized polarizabilities αE1(Q2) and βM1(Q2). These new results show a smooth and rapid fall-off of αE1(Q2), in contrast to previous measurements at Q2 = 0.33 GeV2, and provide for the first time a precise mapping of βM1(Q2) in the low- Q2 region.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA