Strange quarkonium states at BESIII

Abstract

We present physics opportunities and topics with the ss states (strangeonia) that can be studied with the BESIII detector operating at the BEPCII collider. Though the φ and η/η ′ states have long been established experimentally, only a handful of strangeonia are well known, in contrast to the rich cc charmoium system. An overview of the ss states and their experimental status is presented in this paper. The BESIII experiment has collected the world's largest samples of J/ψ, ψ(2S), ψ(3770), and direct e + e − annihilations at energies below the J/ψ and above 3.8 GeV, and will continue to accumulate high quality, large integrated luminosity in the τ -charm energy region. These data, combined with the excellent performance of the BE-SIII detector, will offer unprecedent opportunities to explore the ss system. In this paper we describe the experimental techniques to explore strangeonia with the BESIII detector.

Analysis of the CMD-3 detector data: selection of low-energy electron-positron annihilation into KKππ0

“…The process has rich intermediate dynamics [10]. So, by analysing partial decay widths, we might glean insight into ϕ'' composition [11,12,13]. The data obtained is to be used in (g-2)μ HVP contribution calculation.…”

Experimental Review of Hadron Spectroscopy

“…The low momentum K * andK * mesons easily interact with each other and finally transit to φπ by exchanging a K ( * ) meson 34 . Therefore, it is important to perform an experimental search for the strangeoniumlike structure Z s , since its observation may help us to understand the nature of Z c states 35 .…”

Measurement of cross sections of the interactions e+e−→ϕϕω and e+e−→ϕϕϕ at center-of-mass energies from 4.008 to 4.600 GeV

“…i. Luminosity. The time-integrated luminosity [18] of each sample is measured with a precision of 1% with Bhabha events. j. Branching fractions.…”

“…The integrated luminosity has been determined using Bhabha scattering and its uncertainty is found to be 1% [44]. The systematic uncertainty of the tracking efficiency has been determined using a J/ψ → ppπ + π − control sample [47] and estimated to be 1% per track.…”