Particle Physics
First Evidence for B-Meson Decays to Paired Charmed Baryon-Antibaryon States
Belle and Belle II collaborations report the first observation of B-meson decays to pairs of charmed baryon-antibaryon states: B⁺ → Σc(2455)⁺⁺ Ξ̄c'⁻ and B⁰ → Σc(2455)⁰ Ξ̄c'⁰, with statistical significances of 6.4σ and 5.3σ respectively. The measured branching fractions are (1.68 ± 0.31 ± 0.12⁺¹·⁴⁹₋₀…
ALICE ITS2 MAPS Calibration: Scaling to 12.6 Billion Pixels for LHC Run 3 Stability
ALICE's ITS2, deployed in LHC Run 3, pioneers large-scale MAPS with 24,120 sensors totaling 12.6e9 pixels, 10 m² area, 5 μm resolution, and 0.36% X0 budget in inner layers. It enhances pointing resolution, low-pT tracking, and readout rates over predecessors. Calibration targets in-pixel thresholds …
LHCb Discovers New Excited Charm-Strange Meson D_{s1}(2933)^+ with 1^+ Spin-Parity
LHCb reports observation of a new charm-strange meson D_{s1}(2933)^+ via amplitude analysis of B^0 → D^+ D^- K^+ π^- decays using 5.4 fb^{-1} of pp collision data at 13 TeV. The state has Breit-Wigner mass 2933 MeV and width 72 MeV, with J^P = 1^+ quantum numbers and statistical significance exceedi…
Enhanced W-boson Production Cross-section Measurement at LHCb
The LHCb experiment precisely measured the W-boson production cross-sections in proton-proton collisions at 13 TeV using the W to muon-neutrino decay channel. The study, based on 5.1 fb^-1 integrated luminosity, focused on muons with specific transverse momentum and pseudorapidity ranges. The result…
Observation of the Exotic Meson π1(1600) at BESIII
The BESIII experiment reports the first observation of the exotic meson π1(1600) in the charmonium decay of χc1. This discovery, made with high statistical significance, provides strong evidence for the existence of an exotic hadron with JPC=1−+ quantum numbers, a state not allowed for conventional …
Enhanced Background Rejection in LUX-ZEPLIN Dark Matter Experiment through Advanced Pulse Shape Discrimination
The LUX-ZEPLIN (LZ) experiment, designed for WIMP dark matter detection, faces the challenge of discriminating WIMP signals from background noise. This work presents an optimized pulse shape discrimination (PSD) analysis framework that significantly reduces electronic recoil (ER) backgrounds, reachi…
Finite Temperature Effects on Vector and Axial-Vector Spectral Functions
This paper updates the analysis of vector and axial-vector spectral functions, demonstrating that resonant contributions to spectral integrals can be expressed as multiples of 4π²fπ². This relationship indicates the scale of spontaneous chiral symmetry breaking in QCD. The study further asserts that…
Enhanced Precision in CKM Angle Gamma Measurement Through a Joint LHCb-BESIII Analysis
This research presents a novel, unbinned, model-independent approach to precisely measure the CKM angle gamma. By jointly analyzing data from LHCb and BESIII experiments, the study combines charge-parity violating observables from B-meson decays with strong-phase parameters from D-meson decays. This…
TM020 Cavity Mode Achieves 1.7x KSVZ Axion Sensitivity at 21 μeV
Researchers utilized the TM020 mode in a cylindrical cavity haloscope with an innovative tuning mechanism to search for axion dark matter at masses around 21 μeV, extending beyond the conventional <10 μeV range. This approach delivered sensitivity 1.7 times better than the KSVZ benchmark across a…