Abstract
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.
Highlights
1.1 MotivationThe purpose of this White Paper is to examine the BESIII program [1], to consider further physics opportunities, and to plan for possible upgrades to the BEPCII accelerator and the BESIII detector [2], in order to fulfill the physics potentials with the BESIII experiment
In this chapter we have presented the t√a corresponding s =4.178 GeV, to integrated and 5 fb−1 at lu√minosities s = 4.64 pohf y2s0icsfbs−t1udaites√tsha=t are possible 3.773 GeV, with da6 fb−1 at
Such samples at threshold allow a double-tag technique to be employed where the full event can be reconstructed, even if it contains one undetected particle such as a ν or KL0 meson. These samples provide a unique environment to measure the absolute branching fraction (BF) of charmed hadrons to leptonic, SL and hadronic final states, with very low levels of background
Summary
1.1 MotivationThe purpose of this White Paper is to examine the BESIII program [1], to consider further physics opportunities, and to plan for possible upgrades to the BEPCII accelerator and the BESIII detector [2], in order to fulfill the physics potentials with the BESIII experiment. The spectrum of charmonium states with masses below the open charm threshold has been well-established for several decades These states can be used to precisely test predictions based on various theoretical techniques, ranging from models (like the quark model) to approximations of QCD (like non-relativistic QCD, described below) to numerical calculations of the full QCD Lagrangian (i.e., LQCD). BESIII has already demonstrated that the high statistics and accuracy of the data, illustrated, allow to measure form factors of mesons and baryons with unprecedented accuracy and with paramount impact on hadron structure investigations. These form factors are accessible in the timelike domain via electron-positron annihilations, but can be determined in the spacelike domain in two-photon scattering.
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