arXiv subjects

Benhou Xiang

Publications and source records attributed to Benhou Xiang.

4 recordsLinked to original sources

arXiv2026

A High Performance Partial Wave Analysis Framework for Hadron Spectroscopy

Partial wave analysis (PWA) is a key method in hadron physics for extracting the properties of hadronic resonances. As experimental statistics grow, conventional implementations face severe difficulties in both memory usage and speed. We present \texttt{CTPWA}, a high performance PWA framework based on covariant tensor formalism. This framework adopts extensive precomputation and caching mechanisms, as well as fully GPU-based likelihood computation and minimization. With these optimization, the fitting speed is accelerated by two orders of magnitude relative to autograd-based GPU PWA programs, rendering high-statistics partial-wave analysis feasible at high-precision experiments like BESIII.

hep-ex↗

arXiv2026

A Weighting Method for Incorporating Mass Resolution Effects in Amplitude Analysis

We present a phase-space weighting method for incorporating detector mass-resolution effects into amplitude analysis in an efficient and flexible way. The method uses fully simulated Monte Carlo samples containing both truth-level and reconstructed kinematics to estimate the local detector response around each observed event. Based on these truth-reconstruction correspondences, event-by-event weights are constructed to map theoretical amplitudes from the true phase space to the smeared observational space. In this way, detector smearing can be included in the likelihood fit without performing an explicit multidimensional convolution or on-the-fly detector simulation. The procedure naturally handles nonuniform resolution across the Dalitz plane and can be extended beyond invariant masses to momentum and angular variables. Applied to the decays $J/\psi \rightarrow \Xi^{-} \bar{\Xi}^{+}\pi^0$ and $J/\psi\rightarrow K^-\Lambda\bar{\Xi}^+$, the method significantly reduces biases in fitted resonance parameters and interference patterns, suppresses artificial structures, and improves the reliability of partial-wave analysis and resonance spectroscopy in high-precision hadron experiments.

hep-ex↗

arXiv2026

Dalitz decay of $K^*(892) \rightarrow K \ell^+\ell^-$: A New Probe for Hadronic Structure and Dark Photon Searches

We present the first comprehensive study of the rare Dalitz decay $K^*(892) \rightarrow K \ell^+ \ell^- (\ell = e, \mu)$, providing a prediction for the branching fraction and the dilepton mass spectrum. This decay involves the emission of a virtual photon which converts into a lepton pair, offering a probe of the transition form factor $F_{K^*K}(q^2)$ and underlying meson structure. Using a single pole approximation for the form factor, we present the calculation of the branching fraction for this rare decay channel for the first time. Furthermore, we also investigate the potential to search for a light $A^\prime$ boson (dark photon) appearing as a narrow resonance in the dilepton spectrum, and discuss the experimental sensitivity and new physics opportunities at the dedicated BESIII experiment. Our results establish $K^*(892) \rightarrow K \ell^+ \ell^- (l = e, \mu)$ as a new laboratory for hadronic structure and dark-sector searches.

hep-ex↗

arXiv2023

Novel approach to investigate $η$ decays via $η'\rightarrowππη$

To avoid the impact from the background events directly from $e^+e^-$ annihilations or $J/ψ$ decays, we propose a novel approach to investigate $η$ decays, in particular for its rare or forbidden decays, by using $η^\prime\rightarrowππη$ produced in $J/ψ$ decays at the $τ-$charm factories. Based on the MC studies of a few typical decays, $η\rightarrow ππ$, $γl^+l^- (l= e, μ)$, $l^+l^-$, as well as $l^+l^-π^0$, the sensitivities could be obviously improved by taking advantage of the extra constraint of $η^\prime$. Using one trillion $J/ψ$ events accumulated at the Super $τ$-Charm facility, the precision on the investigation of $η$ decays could be improved significantly and the observation of the rare decay $η\rightarrow e^+e^-$ is even accessable.

hep-ph↗