arXiv subjects

Giuseppe Roselli

Publications and source records attributed to Giuseppe Roselli.

3 recordsLinked to original sources

arXiv2026

Probing the structure of $\chi_{c1}(3872)$: Heavy quark symmetries at work

More than two decades have elapsed since the discovery of $\chi_{c1}(3872)$. For this meson, previously denoted as $X(3872)$, an impressive amount of theoretical and experimental studies has been devoted concerning its properties, decays and production mechanisms. Despite the extensive work, a full understanding of the nature of $\chi_{c1}(3872)$ is missing. I describe a theoretical framework based on the heavy quark large mass limit to analyze the radiative decays of heavy quarkonia, in particular the electric dipole transitions of $\chi_{c1}(2P)$ to $S$-wave charmonia. The results favorably compare to recent LHCb collaboration measurements for $\chi_{c1}(3872)$, if this meson is identified with $\chi_{c1}(2P)$.

hep-ph↗

arXiv2026

Semileptonic $B_q$ decays to heavy tensor mesons

The semileptonic decays of $B_q$ mesons ($q=u,d,s$) to $J^P=2^+$ charmed mesons are investigated. The form factors parametrising the hadronic matrix elements of the weak vector and axial-vector quark currents are evaluated using light-cone QCD sum rules with external $B_q$ state, including the 3-particle contributions. The form factors of pseudoscalar and tensor quark currents occurring in extensions of the Standard Model are also determined. The relations expected in the heavy quark limit are tested, providing a hint about the size of finite heavy quark mass corrections for the various form factors. Results are presented for the semileptonic $B_q$ to heavy tensor meson decay rates in the Standard Model, and for the ratios testing Lepton Flavour Universality.

hep-ph↗

arXiv2025

The charming case of $X(3872)$ and $\chi_{c1}(2P)$

More than twenty years have elapsed since the discovery of $\chi_{c1}(3872)$ (previously denoted as $X(3872)$), and an impressive amount of theoretical and experimental studies has been devoted to its properties, decays and production mechanisms. Despite the extensive work, a full understanding of the nature of $\chi_{c1}(3872)$ is still missing. In the present study we reconsider a theoretical framework based on the heavy quark large mass limit to analyse the radiative decays of heavy quarkonia, in particular the electric dipole transitions of $\chi_{c1}(2P)$ to S-wave charmonia. The results favourably compare to recent measurements for $\chi_{c1}(3872)$, obtained by the LHCb Collaboration, if this meson is identified with $\chi_{c1}(2P)$.

hep-ph↗