The $X$(3872) as a Mass Distribution

E Ruiz Arriola,P García Ortega

doi:10.5506/aphyspolbsupp.14.61

Abstract

All existing experimental evidence of the bound state nature of the X(3872) relies on considering its decay products with a finite experimental spectral mass resolution which is typically $\Delta m \ge 2$ MeV and much larger than its alleged binding energy, $B_X =0.00(18)$MeV. On the other hand, there is a neat cancellation in the $1^{++} $ channel for the invariant $D {\bar D}^*$ mass around the threshold between the continuum and bound state contribution. We discuss the impact of this effect for X(3872) at finite temperature, in prompt production in pp collisions data with a finite $p_T$ or the lineshapes of specific production experiments of exotic states involving triangle singularities

Highlights

— QCD at high temperatures and large densities: heavy-ion collisions, jets, diffraction, hadronisation, quark–gluon plasma, holography, colour-glass condensate, compact stars, applications to astrophysics
This is the 12th edition in a series of Excited QCD workshops that had been previously organised in Poland (2009), Slovakia (2010 and 2015), France (2011), Portugal (2012, 2016 and 2017), Bosnia and Herzegovina (2013 and 2014), Serbia (2018) and Austria (2019)
Pedro Bicudo Roman Höllwieser Jelena Jovićević Robert Kamiński Marina Krstić Marinković

Summary

Introduction

— QCD at high temperatures and large densities: heavy-ion collisions, jets, diffraction, hadronisation, quark–gluon plasma, holography, colour-glass condensate, compact stars, applications to astrophysics. This is the 12th edition in a series of Excited QCD workshops that had been previously organised in Poland (2009), Slovakia (2010 and 2015), France (2011), Portugal (2012, 2016 and 2017), Bosnia and Herzegovina (2013 and 2014), Serbia (2018) and Austria (2019).

Results

Conclusion