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Destefanis, M.

Publications and source records attributed to Destefanis, M..

At least 379 records · Page 21
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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↗
DOE OSTI2020

Measurement of the integrated luminosity of the Phase 2 data of the Belle II experiment

From April to July 2018, a data sample at the peak energy of the Υ(4S) resonance was collected with the Belle II detector at the SuperKEKB electron-positron collider. This is the first data sample of the Belle II experiment. Using Bhabha and digamma events, we measure the integrated luminosity of the data sample to be (496.3±0.3±3.0)pb –1 , where the first uncertainty is statistical and the second is systematic. This work provides a basis for future luminosity measurements at Belle II.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2019

Amplitude analysis of D + → K S 0 π + π + π -

The decay D + → K S 0 π + π + π - is studied with an amplitude analysis using a data set of 2.93 fb - 1 of e + e - collisions at the ψ ( 3770 ) peak accumulated by the BESIII detector. Intermediate states and nonresonant components, and their relative fractions and phases, have been determined. The significant amplitudes, which contribute to the model that best fits the data, are composed of five quasitwo-body decays K S 0 a 1 ( 1260 ) + , K ¯ 1 ( 1270 ) 0 π + K ¯ 1 ( 1400 ) 0 π + , K ¯ 1 ( 1650 ) 0 π + , and K ¯ ( 1460 ) 0 π + , a three-body decay K S 0 π + ρ 0 , as well as a nonresonant component K S 0 π + π + π - . The dominant amplitude is K S 0 a 1 ( 1260 ) + , with a fit fraction of ( 40.3 ± 2.1 ± 2.9 ) % , where the first and second uncertainties are statistical and systematic, respectively.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗