arXiv subjects

Guo-He Yang

Publications and source records attributed to Guo-He Yang.

4 recordsLinked to original sources

arXiv2026

Inclusive beauty-charmed baryons decay $\Xi_{bcq} \to \Xi_{ccq} +X$

We investigate the inclusive weak decay $\Xi_{bcq} \to \Xi_{ccq} + X$ ($q=u,d,s$) within the framework of the non-relativistic potential quark model. Treating the heavy diquarks $\Phi_{bc}$ and $\Phi_{cc}$ as compact color anti-triplet bound states, we calculate the transition form factors via the overlap integral of Schr\"odinger wave functions derived from the Cornell potential. The decay rates for four dominant channels-$\Phi_{bc} \to \Phi_{cc} + \bar{c}s$, $\Phi_{bc} \to \Phi_{cc} + \bar{u}s$, $\Phi_{bc} \to \Phi_{cc} + e/\mu + \bar{\nu}$, and $\Phi_{bc} \to \Phi_{cc} + \tau + \bar{\nu}_{\tau}$-are computed, yielding a total inclusive decay width of $\Gamma(\Xi_{bcq} \to \Xi_{ccq} + X) \approx 4.1 \times 10^{-13}$ GeV. We also evaluate the potential background from $B_c^- \to \Xi_{cc} + X$ decays, finding a rate of approximately $ 3.0 \times 10^{-14}$ GeV, which is roughly one order of magnitude smaller than the signal process. Our results suggest that the inclusive decay $\Xi_{bc} \to \Xi_{cc} + X$ , followed by the well-established $\Xi_{cc}$ decay chains, provides a viable discovery channel for the doubly heavy baryon $\Xi_{bc}$ at the LHC.

hep-ph↗

arXiv2024

A unified scheme for calculating the exclusive semi-leptonic decays of hadrons

Exclusive semi-leptonic decay stands as a pivotal channel in the exploration of heavy flavor physics, primarily due to its straightforward experimental measurability. In this work, we delve into the hadron matrix element and hadron tensor within the context of exclusive semi-leptonic decays. We challenge the conventional exclusive decay theory by introducing a fresh perspective, revealing that while the baryon sector is consistent, the meson sector warrants revision. Employing a novel form factor derived from the Taylor series expansion in our differential width calculations, we demonstrate that fitting experimental data necessitates a more streamlined and minimal parameter set compared to the standard Light Cone Sun Rul(LCSR) form factors. Furthermore, we propose that our hypothesis can be empirically validated or refuted through the precise measurement of the double differential decay width, offering a tangible path forward for experimental validation.

hep-ph↗

arXiv2022

Inclusive weak-annihilation decays and lifetimes of beauty-charmed baryons

Imbalanced beauty-charmed baryons $ Ξ_{bc}^{+,0} $ are of great significance to the development of heavy flavor physics. In this work, we study the inclusive weak-annihilation decays of $Ξ_{bc}^{+,0}$ and their contributions to the $Ξ_{bc}^{+,0}$ lifetimes. For the calculation of the inclusive $Ξ_{bc}^{+,0}\to X_{cs}$ decay width where $X_{cs}$ stands for the sum of the final states with charm number +1 and strange number -1, we work in the heavy diquark effective theory which provides us with a convenient technical tool to construct the operator product expansion. The $Ξ_{bc}^{+,0}$ is considered to be a superposition of two states with one containing a spin-0 $bc$ diquark and the other one containing a spin-1 $bc$ diquark. It is found that both the $Ξ_{bc}^{+,0}$ lifetimes and the $Ξ_{bc}^{+,0}\to X_{cs}$ branching ratios are very sensitive to the $bc$ spin in $Ξ_{bc}^{+,0}$. The $Ξ_{bc}^{+,0}\to X_{cd}$ results are also presented. As $Ξ_{bc}^+$ has a longer lifetime than $Ξ_{bc}^{0}$ and bigger branching ratios of similar decay channels, the exclusive decays $Ξ_{bc}^+\to D^{(*)+}Λ$, $Ξ_{bc}^+\to Λ_c^+\bar{K}^{(*)0}$, $Ξ_{bc}^+\to D^{(*)+}K^-p$, and $Ξ_{bc}^+\to D^{0}\bar{K}^{(*)0}p$ are more promising for experimental searches of $Ξ_{bc}^{+,0}$ at the LHC comparing with exclusive decay $Ξ_{b c} ^{0} \to D^0pK^-$.

hep-ph↗

arXiv2022

Inclusive approach to hunt for the beauty-charmed baryons $Ξ_{bc}$

With a distinctive internal structure from all established hadrons, the beauty-charmed baryons $Ξ_{bc}$ can provide us with new points of view to decipher the strong interaction. In this work, we point out that the inclusive $Ξ_{bc} \to Ξ_{cc}^{++}+X$ decay is a golden channel for the experimental discovery of $Ξ_{bc}$ at the LHC. A unique feature of this process is that the $Ξ_{cc}^{++}$ is displaced, which greatly reduces the combinatorial background. A feasibility analysis is performed on the $Ξ_{bc}^+$ search, which is expected to have a longer lifetime than $Ξ_{bc}^0$ and thus a better displacement resolution. The $Ξ_{bc}^+ \to Ξ_{cc}^{++}+X$ branching ratio is calculated within the heavy diquark effective theory. Combining the $Ξ_{bc}$ production rate and the $Ξ_{cc}^{++}$ detection efficiency, we anticipate that hundreds of signal events will be collected during LHCb Run 3.

hep-ph↗