arXiv subjects

Shaogang Peng

Publications and source records attributed to Shaogang Peng.

3 recordsLinked to original sources

arXiv2026

Spin density matrix for high-spin particles

The spin density matrix (SDM) characterizes the spin state of a particle, which provides important information for understanding its production mechanism. A general discussion of the SDM under parity conservation, and specific SDM parameterizations for spin-1 and spin-2 particles are provided, which respect all the expected constraints. The imaginary (real) part of SDM is related to the degree of odd-rank (even-rank) polarization, with specific expressions given for spin-1 and spin-2 cases. Examples of applications of the SDM to angular analyses of several decay processes with different spin-parity hypotheses are also provided, which could be helpful in experimental data analyses.

hep-ph↗

arXiv2026

Single event effects in the HCCStar ASICs for ITk strip upgrade

Triple Modular Redundancy (TMR) technology has been implemented in the design of the HCCStar to reduce digital state changes and ensure reliable operation. We tested the effectiveness of the protection by placing HCCStar chips in a proton beam. We studied corrected bit flips in registers and actual single event effects in the LCB and LP paths under different proton energies. Our estimate is that the LP data-loss fraction relative to the 400 kHz readout is $O(10^{-10})$ during normal operation and there will be $O(10)$ corrected bit flips per HCCStar bit per year at the HL-LHC.

physics.ins-det↗

arXiv2024

Precision test of the weak interaction with slow muons

We propose to use slow muons facilities combined with cyclotron radiation detection for precision test of the weak interaction in the muon decays. Slow positive muon bunches are first injected into a cylindrical superconducting vacuum chamber with uniform strong axial magnetic fields to radially confine the muons. The positrons resulting from muon decays can be detected by their cyclotron radiation, which can be transported to low-noise electronic devices through waveguides coupled to the chamber. The decay positron's energy can be precisely measured down to eV level in the low energy region, which is sensitive to new physics effects such as Majorana neutrinos and new structures of weak interactions.

physics.ins-det↗