6533b837fe1ef96bd12a1ea0
RESEARCH PRODUCT
New Insight in the $Q^2$-Dependence of Proton Generalized Polarizabilities
Patrick AchenbachNikolaos SparverisS. KegelJ. PochodzallaJ. BeričičS. Sánchez MajosC. Ayerbe GayosoS. ŠIrcaS. ŠIrcaIvica FriščićL. DebenjakA. G. DenigU. MüllerAnselm EsserL. NungesserA. BlombergMichaela ThielA. TyukinConcettina SfientiDamir BosnarMihael MakekL. CorreaL. CorreaM. MihovilovičM. MihovilovičY. KohlM. SchothH. FonvieilleA. WeberJan C. BernauerJan C. BernauerR. BöhmF. SchulzM. BenaliE. J. DownieM. O. DistlerB. S. SchlimmeMichael PaoloneS. ŠTajnerM. WeinrieferD. G. MiddletonHarald Merkelsubject
PhysicsProtonCompton scatteringFOS: Physical sciencesGeneral Physics and Astronomy25.30.Dh[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesNATURAL SCIENCES. Physics.PRIRODNE ZNANOSTI. Fizika.Nuclear physics13.60.FzVirtual Compton Scattering VCS Proton Polarizability MAMI0103 physical sciences14.20.DhNuclear Experiment (nucl-ex)010306 general physicsNuclear ExperimentNuclear Physicsdescription
Virtual Compton scattering on the proton has been investigated at three yet unexplored values of the four-momentum transfer $Q^2$: 0.10, 0.20 and 0.45 GeV$^2$, at the Mainz Microtron. Fits performed using either the low-energy theorem or dispersion relations allowed the extraction of the structure functions $P_{LL} -P_{TT} / \epsilon$ and $P_{LT}$, as well as the electric and magnetic generalized polarizabilities $\alpha_{E1}(Q^2)$ and $\beta_{M1}(Q^2)$. These new results show a smooth and rapid fall-off of $\alpha_{E1}(Q^2)$, in contrast to previous measurements at $Q^2$ = 0.33 GeV$^2$, and provide for the first time a precise mapping of $\beta_{M1}(Q^2)$ in the low-$Q^2$ region.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-01-01 |