The meson spectroscopy program with CLAS12 at Jefferson Laboratory

Abstract

The study of the hadronic spectrum is one of the most powerful tools to investigate the mechanism at the basis of quark confinement within hadrons. A precise determination of the spectrum allows not only to assess the properties of the hadrons in their fundamental and excited states, but also to investigate the existence of states resulting from alternative configurations of quarks and gluons, such as the glue-balls, hybrid hadrons and many-quarks configurations. The study of the mesonic part of the spectrum can play a central role in this investigation thanks to the strong signature that the hybrid mesons are expected to have: the presence of explicit gluonic degrees of freedom in such states may result in J PC configurations not allowed for the standard qq states. From the experimental side the expected high-multiplicity decays of the hybrid mesons require an apparatus with high performances in terms of rate-capability, resolution and acceptance. The CLAS12 experiment (formally MesonEx) is one of new-generation experiments at Thomas Jefferson National Laboratory (JLAB) for which an unprecedented statistics of events, with fully reconstructed kinematics for large particle multiplicity decays, will be available. A wide scientific program that will start in 2016 has been deployed for meson spectrum investigation with the CLAS12 apparatus in Hall B at energies up to 11 GeV. One of the main parts of the program is based on the use of the Forward Tagger apparatus, which will allow CLAS12 experiment to extend the study of meson electro-production to the quasi-real photo-production kinematical region (very low Q 2 ), where the production of hybrid mesons is expected to be favoured. The data analysis which is required to extract the signal from hybrid states should go beyond the standard partial wave analysis techniques and a new analysis framework is being set up through the international network Haspect. The Haspect Network gathers people involved into theoretical and experimental hadronic physics all over the world, to investigate and propose new analysis models and new statistical techniques to unfold signal and background. The new analysis framework is being developed and tested using the existing CLAS data and results are projected to the CLAS12 performances, showing that the quest for hybrid exotic mesons is at reach.

Strong and radiative decays of excited vector mesons and predictions for a new ϕ(1930) resonance

“…Yet, a dedicated search by using partial wave analysis could reveal the existence of this state. In general, the very promising GlueX [77,78,79] and CLAS12 [80] experiments take place in the near future. The process in Fig.…”

Strong Decays of Excited Vector Mesons

“…For the putative state φ(1930) there are four different decay channels. Even if this resonance is expected to be broad, it could be measured in the future at the GlueX [16] and CLAS12 [17] experiments at Jefferson lab.…”

From well-known tensor mesons to yet unknown axial-tensor mesons

“…Refs. [19][20][21][22][23][24][25][26][27][28][29][30] and refs. therein), even if that shall not be an easy task, due to the expected large decay widths.…”

“…Light mesons (both conventional and exotic) are in the centre of various experimental searches, such as the BESIII [19,20], CLAS12 [21], COMPASS [22], GlueX [23][24][25] experiments as well as the planned PANDA experiment [26]. In particular, photoproduction of tensor mesons represents an active experimental [27] and phenomenological [28][29][30] topic.…”