Recent results from BESIII experiment: observation of the Z_cs(3985) strange four-quark meson.

by Michela Greco (Dipartimento di Fisica, Università di Torino e INFN Torino)

Monday 14 Jun 2021, 16:00 → 17:30 Europe/Rome

BESIII has reported the discovery of an exotic multi-quark structure, dubbed the Zcs(3985), that is produced in e+e- collisions at a center-of-mass energy of 4.68 GeV. The Zcs(3985) is observed to decay to a charged strange-charmed meson plus a neutral charmed meson and has a mass of 3.98 GeV/c2. This is the first candidate for a tetra-quark meson containing hidden-charm with non-zero strangeness.
A search for the Zcs was among the prominent physics motivations, proposed by BESIII, for increasing the center-of-mass energy reach as part of the BEPCII upgrade. In January  this machine has reached the record of center-of-mass energy of 4.916 GeV,  opening the way to charmed baryons studies.

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