Holographic description of heavy-flavored baryonic matter decay involving glueball

Abstract

We holographically investigate the decay of heavy-flavoured baryonic hadron involving glueball by using the Witten-Sakai-Sugimoto model. Since baryon in this model is recognized as the D4-brane wrapped on S 4 and the glueball field is identified as the bulk gravitational fluctuations, the interaction of the bulk graviton and the baryon brane could be naturally interpreted as glueball-baryon interaction through the holography which is nothing but the close-open string interaction in string theory. In order to take account into the heavy flavour, an extra pair of heavy-flavoured branes separated from the other flavour branes with a heavylight open string is embedded into the bulk. Due to the finite separation of the flavour branes, the heavy-light string creates massive multiplets which could be identified as the heavy-light meson fields in this model. As the baryon brane on the other hand could be equivalently described by the instanton configuration on the flavour brane, we solve the equations of motion for the heavy-light fields with the Belavin-Polyakov-Schwarz-Tyupkin (BPST) instanton solution for the N f = 2 flavoured gauge fields. Then with the solutions, we evaluate the soliton mass by deriving the flavoured onshell action in strongly coupling limit and heavy quark limit. After the collectivization and quantization, the quantum mechanical system for glueball and heavy-flavoured baryon is obtained in which the effective Hamiltonian is time-dependent. Finally we use the standard technique for the time-dependent quantum mechanical system to analyze the decay of heavy-flavoured baryon involving glueball and we find one of the decay process might correspond to the decay of baryonic B-meson involving the glueball candidate f 0 (1710). This work is a holographic approach to study the decay of heavy-flavoured hadron in nuclear physics.

The interaction of glueball and heavy-light flavoured meson in holographic QCD

“…[32,33] and the glueball decay/production involving the heavy-light mesons in hadron physics. Our results are also in agreement with the previous works in [25,26,34].…”

The D4/D8 Model and Holographic QCD

“…To search for an approximate solution under the condition N f /N c 1, the solution with N f = 0 is therefore the zero-th order solution to the equations of motion from (111), which is nothing but the bubble and black D4-brane solution given in ( 14) and ( 16). Then, let us attempt to find a solution of O N f /N c to the bubble D4-brane ( 16) first.…”

“…We note that U KK is replaced by U H in the black brane case. Putting ( 124) and ( 125) into action (111), it leads to a 1d action:…”

“…Now. it is possible to obtain the free energy of the dual theory involving the flavored matters by imposing the above leading-order solutions into the action given in (111) after holographic renormalization. Before this, we need to add an additional holographic counterterm to (105) in order to cancel the divergence in the DBI action presented in (111), which turned out to be [34,[76][77][78]]…”

“…Moreover, when the backreaction to the bulk geometry of the flavor branes is picked up, it is also possible to evaluate QCD deconfinement transition under an external magnetic field, because extremely strong magnetic field may also give rise to deconfinement transition in QCD [83][84][85][86]. The setup mostly follows the same discussion given above, while we need to turn on a constant magnetic field in the DBI action is presented in (111), as the only nonzero component of the gauge field strength. Then, we can derive the effective 1d action by using the metric ansatz ( 112) and ( 124) with respect to the bubble and black D4-brane background.…”