Helicity Amplitude Analysis of ${Z_{\rm c}(3900)^\pm}$ in ${e^+e^-}\to\pi^+\pi^-{J/\psi}$

doi:10.1088/0256-307X/33/6/061401

Chin. Phys. Lett.

2016, Vol. 33

Issue (06): 061401 DOI: 10.1088/0256-307X/33/6/061401

THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Helicity Amplitude Analysis of ${Z_{\rm c}(3900)^\pm}$ in ${e^+e^-}\to\pi^+\pi^-{J/\psi}$

Rong-Gang Ping^1**, J. G. Messchendorp², Chang-Zheng Yuan¹

¹Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
²KVI-CART, University of Groningen, Groningen NL-9747 AA, Netherlands

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Rong-Gang Ping, J. G. Messchendorp, Chang-Zheng Yuan 2016 Chin. Phys. Lett. 33 061401

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Abstract It is crucial to determine the spin and parity ($J^{P}$) of ${Z_{\rm c}(3900)^\pm}$ for understanding its structure. We perform a helicity amplitude analysis on ${Z_{\rm c}(3900)^\pm}$ in the process ${e^+e^-}\to\pi^+\pi^-{J/\psi}$ with the hypotheses $J^{P}=0^-$, $1^+$, $1^-$, $2^+$ and $2^-$. To estimate the significance of $J^{P}=1^+$ over other hypotheses, we perform a Monte Carlo simulation study, and we also discuss the prospect of measuring the spin parity in the future experiment with a large data sample.

Received: 10 March 2016 Published: 30 June 2016

PACS:	14.40.Rt	(Exotic mesons)
	14.40.Pq	(Heavy quarkonia)
	13.30.Eg	(Hadronic decays)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/33/6/061401 OR https://cpl.iphy.ac.cn/Y2016/V33/I06/061401

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	Rong-Gang Ping
	J. G. Messchendorp
	Chang-Zheng Yuan

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