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SUMMARY:Left hand cut and quark mass dependence of Tcc using lattice QCD -
  M. Padmanath\, Institute of Mathematical Sciences\, Chennai
DTSTART:20240626T103000Z
DTEND:20240626T113000Z
UID:TALK217312@talks.cam.ac.uk
CONTACT:Christopher Thomas
DESCRIPTION:The LHCb discovery of doubly charm tetraquark Tcc in 2021 spar
 ked significant interest in theoretical\ninvestigations of doubly heavy te
 traquarks. In our previous lattice QCD investigation (PRL 2021)\, we have\
 ndemonstrated that at the unphysically heavy pion masses we work with\, th
 e Tcc pole in the DD&ast\;\nscattering amplitude corresponds to a virtual 
 bound pole. It was later pointed out by Du et al.\, and\nothers that the p
 resence of nonanalyticities arising out of Mandelstam u-channel off-shell 
 pion exchanges\,\ninvalidates some of the assumptions we have made in the 
 subthreshold region. In our recent work\,\nwe perform a study of quark mas
 s dependence of the amplitudes following two approaches. One based on\nthe
  vanilla effective range expansion\, and the next based on an effective fi
 eld theory of interactions to\ndescribe the DD&ast\; scattering that incor
 porates the one-pion exchange process.\n
LOCATION:MR11 (B1.39)\, Pavilion B\, CMS
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