arXiv subjects

Xiaolin Kang

Publications and source records attributed to Xiaolin Kang.

6 recordsLinked to original sources

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 $J/ψ\rightarrow Ξ^{-} \barΞ^{+}π^0$ and $J/ψ\rightarrow K^-Λ\barΞ^+$, 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↗

arXiv2025

Huizhou Hadron Spectrometer -- a Proposed High-rate Experimental Setup at the High Intensity Heavy-ion Accelerator Facility

The High-Intensity Heavy-Ion Accelerator Facility (HIAF), currently under construction in Huizhou, Guangdong Province, China, is projected to be completed by 2025. This facility will be capable of producing proton and heavy-ion beams with energies reaching several GeV, thereby offering a versatile platform for advanced fundamental physics research. Key scientific objectives include exploring physics beyond the Standard Model through the search for novel particles and interactions, testing fundamental symmetries, investigating exotic hadronic states such as di-baryons, pentaquark states and multi-strange hypernuclei, conducting precise measurements of hadron and hypernucleus properties, and probing the phase boundary and critical point of nuclear matter. To facilitate these investigations, we propose the development of a dedicated experimental apparatus at HIAF - the Huizhou Hadron Spectrometer (HHaS). This paper presents the conceptual design of HHaS, comprising a solenoid magnet, a five-dimensional silicon pixel tracker, a Low-Gain Avalanche Detector (LGAD) for time-of-flight measurements, and a Cherenkov-scintillation dual-readout electromagnetic calorimeter. The design anticipates an unprecedented event rate of 1-100 MHz, extensive particle acceptance, a track momentum resolution at 1% level, an electromagnetic energy resolution of ~3% @ 1 GeV and multi-particle identification capabilities. Such capabilities position HHaS as a powerful instrument for advancing experimental studies in particle and nuclear physics. The successful realization of HHaS is expected to significantly bolster the development of medium- and high-energy physics research within China.

hep-ex↗

arXiv2025

High-Precision Physics Experiments at Huizhou Large-Scale Scientific Facilities

In response to the capabilities presented by the High-Intensity Heavy Ion Accelerator Facility (HIAF) and the Accelerator-Driven Subcritical System (CiADS), as well as the proposed Chinese Advanced Nuclear Physics Research Facility (CNUF), we are assembling a consortium of experts in relevant discipline--both domestically and internationally--to delineate high-precision physics experiments that leverage the state-of-the-art research environment afforded by CNUF. Our focus encompasses six primary domains of inquiry: hadron physics--including endeavors such as the super eta factory and investigations into light hadron structures; muon physics; neutrino physics; neutron physics; the testing of fundamental symmetries; and the exploration of quantum effects within nuclear physics, along with the utilization of vortex accelerators. We aim to foster a well-rounded portfolio of large, medium, and small-scale projects, thus unlocking new scientific avenues and optimizing the potential of the Huizhou large scientific facility. The aspiration for international leadership in scientific research will be a guiding principle in our strategic planning. This initiative will serve as a foundational reference for the Institute of Modern Physics in its strategic planning and goal-setting, ensuring alignment with its developmental objectives while striving to secure a competitive edge in technological advancement. Our ambition is to engage in substantive research within these realms of high-precision physics, to pursue groundbreaking discoveries, and to stimulate progress in China's nuclear physics landscape, positioning Huizhou as a preeminent global hub for advanced nuclear physics research.

hep-ph↗

arXiv2025

Simulation of dark photon sensitivity in $η\rightarrow γe^+e^-$ at HIAF

We present a simulation study of dark photon sensitivity in a suggested $η$ factory experiment at Huizhou. The vast number of $η$ mesons are produced by bombarding the high-intensity HIAF proton beam on a multi-layer target of light nucleus. The kinematic energy of the beam is at 1.8 GeV. For a prior experiment of one-month running, about $5.9 \times 10^{11}$ $η$ samples would be collected, providing substantial data for a sound statistical analysis. A compact spectrometer based on the full silicon-pixel tracker is conceptually designed for the detection of the final-state particles. The GiBUU event generator is utilized for the background estimation without the dark photon signal. A spectrometer simulation package ChnsRoot is constructed for evaluating the spectrometer performances in searching the dark photon in $η$ rare decay. The efficiency and resolutions of $η\rightarrow γe^+e^-$ decay channel are studied in detail. The branching-ratio upper limit of dark photon in $η\rightarrow γe^+e^-$ decay and the sensitivity to the model parameter are given from the simulations.

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↗

arXiv2019

Study of $η$-meson Decays at KLOE/KLOE-2

Working at a $ϕ$-factory, KLOE/KLOE-2 has collected a very large and clean sample of $η$ decays, which allow to perform a variety of precision measurements. This report presents the recent results on the $η$-meson decays from KLOE/KLOE-2 experiments, including the search of the $C$-violating decay $η\rightarrowγγγ$, the determination of the $CP$ asymmetry in $η\rightarrowπ^+π^-e^+e^-$, the precision measurement of the $η\rightarrowπ^+π^-π^0$ Dalitz plot distribution, the search for the $CP$-violating decay $η\rightarrowπ^+π^-$ and the precision measurement of ${\cal O}(p^6)$ dominated decay $η\rightarrowγγπ^0$.

hep-ex↗