Eur. Phys. J. C (2018) 78: 456
https://doi.org/10.1140/epjc/s10052-018-5945-3

Regular Article - Theoretical Physics

X(16.7) production in electron–positron collision

¹ School of Physical Sciences, University of Chinese Academy of Sciences, YuQuan Road 19A, Beijing, 100049, China
² School of Physics and Electronic Engineering, Guangzhou University, Guangzhou, 510006, China
³ CAS Center for Excellence in Particle Physics, Beijing, 100049, China

^* e-mail: qiaocf@ucas.ac.cn

Received: 13 February 2018
Accepted: 29 May 2018
Published online: 6 June 2018

Abstract

The anomaly found in the excited nuclear transition to its ground state is attributed to a spin-1 gauge boson X(16.7). To hunt for this boson, we propose two traps: and , both following with decay. We adopt the “vector minus axial-vector” interaction hypothesis. Analysis on the X(16.7) decay length, production rates, differential distribution with respect to the invariant-mass spectrum, and the signal-to-noise ratios (SNR) after the smearing at BESIII detector are discussed in detail. Given the coupling strength of X to vector/axial-vector currents at BESIII: (1) there would be about 6000 X measurable events per year in electron–positron collision, yet with a large background after smearing; (2) while in decays, we find that the axial-vector current may come into play; though merely 52 events may appear, the SNR are inspiring even after smearing.