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Alekseev, M.

Publications and source records attributed to Alekseev, M..

12 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2022

ATHENA detector proposal—a totally hermetic electron nucleus apparatus proposed for IP6 at the Electron-Ion Collider

ATHENA has been designed as a general purpose detector capable of delivering the full scientific scope of the Electron-Ion Collider. Careful technology choices provide fine tracking and momentum resolution, high performance electromagnetic and hadronic calorimetry, hadron identification over a wide kinematic range, and near-complete hermeticity. This article describes the detector design and its expected performance in the most relevant physics channels. It includes an evaluation of detector technology choices, the technical challenges to realizing the detector and the R&D required to meet those challenges.

47 OTHER INSTRUMENTATION↗
DOE OSTI2020

Observation of X(2370) and search for X(2120) in $J/\psi \rightarrow \gamma K{\bar{K}} \eta '$: BESIII Collaboration

Using a sample of 1.31 × 10 9 J/ψ events collected with the BESIII detector, we perform a study of J/ψ → γKK¯η'. X(2370) is observed in the KK¯η' invariant-mass distribution with a statistical significance of 8.3σ. Its resonance parameters are measured to be M = 2341.6 ± 6.5(stat.) ± 5.7(syst.) MeV/c 2 and Γ = 117 ± 10(stat.) ± 8(syst.) MeV. The product branching fractions for J/ψ → γX(2370), X(2370) → K + K – η' and J/ψ → γX(2370), X(2370) → $K$ $^{0}_{S}$ $K$ $^{0}_{S}$η' are determined to be (1.79 ± 0.23(stat.) ± 0.65(syst.)) × 10 –5 and (1.18 ± 0.32(stat.) ± 0.39(syst.)) × 10 –5 , respectively. No evident signal for X(2120) is observed in the KK¯η' invariant-mass distribution. The upper limits for the product branching fractions of B(J/ψ → γX(2120) → γK + K – η') and B(J/ψ → γX(2120) → $K$ $^{0}_{S}$ $K$ $^{0}_{S}$η') are determined to be 1.49 × 10 –5 and 6.38 × 10 –6 at the 90% confidence level, respectively.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2020

Future Physics Programme of BESIII

There has recently been a dramatic renewal of interest in hadron spectroscopy and charm physics. This renaissance has been driven in part by the discovery of a plethora of charmonium-like XYZ states at BESIII and B factories, and the observation of an intriguing proton-antiproton threshold enhancement and the possibly related X(1835) meson state at BESIII, as well as the threshold measurements of charm mesons and charm baryons. We present a detailed survey of the important topics in tau-charm physics and hadron physics that can be further explored at BESIII during the remaining operation period of BEPCII. This survey will help in the optimization of the data-taking plan over the coming years, and provides physics motivation for the possible upgrade of BEPCII to higher luminosity.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗