The nature of states from a combined analysis of and

Wen-Sheng Huo; Guo-Ying Chen

doi:10.1140/epjc/s10052-016-4013-0

EPJ

The nature of $$Z_b$$

states from a combined analysis of $\Upsilon (5S)\rightarrow h_b(mP) \pi ^+ \pi ^-$ and $\Upsilon (5S)\rightarrow B^{(*)}\bar{B}^{(*)}\pi$

Wen-Sheng Huo¹ and Guo-Ying Chen¹^,2^*

¹ Department of Physics, Xinjiang University, Ürümqi, 830046, China
² State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, China

Received: 5 November 2015
Accepted: 11 March 2016
Published online: 29 March 2016

Abstract

With a combined analysis of data on $\Upsilon (5S)\rightarrow h_b(1P,2P)\pi ^+\pi ^-$ and $\Upsilon (5S)\rightarrow B^{(*)}\bar{B}^{(*)}\pi$ in an effective field theory approach, we determine resonance parameters of $$Z_b$$

states in two scenarios. In one scenario we assume that $$Z_b$$

states are pure molecular states, while in the other one we assume that $$Z_b$$

states contain compact components. We find that the present data favor that there should be some compact components inside $Z_b^{(\prime )}$ associated with the molecular components. By fitting the invariant mass spectra of $\Upsilon (5S)\rightarrow h_b(1P,2P)\pi ^+\pi ^-$ and $\Upsilon (5S)\rightarrow B^{(*)}\bar{B}^{*}\pi$ , we determine that the probability of finding the compact components in $$Z_b$$

states may be as large as about 40 %.

15th European Conference on Atoms Molecules and Photons (ECAMP)
June 30 to July 4, 2025
Innsbruck, Austria

EPJ

The nature of states from a combined analysis of $\Upsilon (5S)\rightarrow h_b(mP) \pi ^+ \pi ^-$ and $\Upsilon (5S)\rightarrow B^{()}\bar{B}^{()}\pi$

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