J/psi + Upsilon associated production and prospects to observe a new heavy tetraquark state

19 Nov 2019, 12:00
20m
Double Parton Scattering Double Parton Scattering

Speaker

Dr Sergey Baranov (P.N.Lebedev Institute of Physics)

Description

We consider a new mechanism for prompt simultaneous production of $J/\psi$ and $\Upsilon$ mesons in high energy hadronic collisions. The process is considered as a perturbative production of $B_c^{(*)}$ mesons $g{+}g\to B_c^{(*)} {+}\bar{B_c}^{\!\!(*)}$ followed by a long-distance final state interaction that rearranges the quarks to form $J/\psi$ and $\Upsilon$ mesons. Passing from $B_c^{(*)}{+}\bar{B_c}^{\!\!(*)}$ configuration to $J/\psi{+}\Upsilon$ configuration may proceed via a hypothetical resonance state, the tetraquark. The goal of this work is to examine whether the respective cross section is large enough to encourage a direct detection of the tetraquark at the LHC conditions (yes), and whether this hypothesis can help to explain the D0 data without assigning an unusually low value to $\sigma_{\rm eff}$ in the double parton scattering mechanism (no).

Primary author

Dr Sergey Baranov (P.N.Lebedev Institute of Physics)

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