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Tensor-structure sum rules for spin-1 targets at all
Vladimir Pascalutsa, Marc Vanderhaeghen
We derive a family of sum rules for the tensor structure functions of targets with spin one or higher, rooted in exact Siegert relations. The mixed rank-two -- degeneracy c…
A dispersive estimate of the contribution to
Oleksandra Deineka, Igor Danilkin, Marc Vanderhaeghen
A dispersive implementation of the resonance to requires the knowledge of the double-virtual -wave amplitudes. To obtain these ampli…
Phenomenological model for the reaction in the energy region
Xiu-Lei Ren, Igor Danilkin, Marc Vanderhaeghen
Motivated by the ongoing analysis by the BESIII Collaboration on the single-tagged reaction, we present a phenomenological study of the diphoton fusion t…
Pion polarizabilities from a dispersive analysis of
Viktoriia Ermolina, Igor Danilkin, Marc Vanderhaeghen
We present results for the charged and neutral pion polarizabilities, obtained through a dispersive analysis of photon-fusion reactions with two pions in the final state. This anal…
Constraints for scalars and pseudoscalars from and existing colliders
Aleksandr Pustyntsev, Marc Vanderhaeghen
Scalars and pseudoscalars with masses in the MeV to GeV range are of interest in different extensions of the Standard Model. Such particles are often associated with dark matter, t…
Constraining the axial-vector X17 interpretation with C data
Cornelis J. G. Mommers, Marc Vanderhaeghen
Recent findings of an unexpected, narrow resonance in the decay spectra of excited states of Be, He and C by the ATOMKI collaboration have received consider…