Phenomenology 2018 Symposium

Charmed Baryon to Strange Baryon Decay using QCD Sum Rules

8 May 2018, 15:45

15m

G-27 (Benedum Hall)

QCD & EW I

Speaker

Mr Bijit Singha (Carnegie Mellon University)

Description

We estimate the rate of the Cabibbo-favored weak decay, ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Lambda }}_s^0{\pi }^{+}$, using QCD Sum Rules. A three-point correlation function of field operators corresponding to charmed lambda (${\mathrm{\Lambda }}_c^{+}$), strange lambda (${\mathrm{\Lambda }}_s^0$), and weak Hamiltonian ($H_W$) is considered in the presence of an external pion field. We evaluate the lowest-order perturbative diagram in which the charm quark decays into the strange quark via a weak-charged current. A dispersion relation is used for the correlator obtained from the OPE, and a Borel transform is carried out to ensure rapid convergence. After comparing the decay rate for this process to the strong decay mode, ${\mathrm{\Lambda }}_c^{+}\to p{K}^{-}{\pi }^{+}$, we find this weak decay to be small and consistent with experimental observations.

Presentation materials

BijitSingha_Pheno.pdf