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v3.3.5
Abstract:
The internal structure of meson can be investigated by studying the electromagnetic form factor and the $\gamma^* \gamma^* - Quarkonium$ transition form factor. Recently, there has been a lot of interest in the exclusive production of mesons by photon fusion processes, especially in the $e^+ e^-$ colliders. This study is strongly motivated by the expectation that the cross-section measurement will give strong constraints on the parton structure of the meson.
We will introduce a formalism of light-front quarkonium wave functions obtained from a solution of the Schrödinger equation for a selection of interquark potentials for $q \bar q$ interaction. We will present the helicity structure and covariant decomposition of the matrix elements that can be generically applied for any $q\bar q$ pseudo-scalar, scalar, axial-vector and vector photon-meson transition. We will discuss the light-front wave function representation of the helicity form factors as functions of photon virtualities. We will discuss $\eta_c$, $\chi_{c0}$, $\chi_{c1}$, $\chi_{c2}$, and exotic state $\chi_{c1}(3872)$.
About the speaker:
Dr. Babiarz is post-doc at the Institute of Nuclear Physics Polish Academy of Sciences in Kraków. She defended her doctoral thesis "Selected production mechanism of quarkonia with even charge parity" in 2022 under the supervision of dr hab. Wolfgang Schafer, prof IFJ PAN. In 2019, she became a laureate of the W. Iwanowska programme NAWA and spent two semesters at Lund University in Sweden, working on Diffractive exclusive production of p-wave quarkonia states under the supervision of Roman Pasechnik.
Recording content
PW:p6p.@eR8
Zoom link:
ID: 93707743309
PW: 678883
https://zoom.us/j/93707743309?pwd=VmxlZGVlbjdqTGxjbnhjR0lXM1AyZz09