First measurement of the Q^2 distribution of X(3915) single-tag two-photon production

TL;DR

This paper presents the first measurement of the $Q^2$ distribution for the $X(3915)$ particle produced via single-tag two-photon interactions, providing insights into its structure and production mechanism.

Contribution

It provides the first experimental $Q^2$ distribution measurement of $X(3915)$ in two-photon production, comparing results with a theoretical $car{c}$ model.

Findings

Observed 7.9±3.1 events with large statistical uncertainties.

Distribution shape aligns with the $car{c}$ model predictions.

Results suggest consistency with theoretical expectations despite limited statistics.

Abstract

We report the first measurement of the $Q^2$ distribution of $X(3915)$ produced by single-tag two-photon interactions. The decay mode used is $X(3915) \rightarrow J/\psi\omega$. The covered $Q^2$ region is from 1.5 (GeV/$c$)$^2$ to 10.0 (GeV/$c$)$^2$. We observe $7.9\pm 3.1({\rm stat.})\pm 1.5({\rm syst.})$ events, where we expect $4.1\pm 0.7$ events based on the $Q^2=0$ result from the no-tag two-photon process, extrapolated to higher $Q^2$ region using the $c\bar{c}$ model of Schuler, Berends, and van Gulik. The shape of the distribution is also consistent with this model; we note that statistical uncertainties are large.