On the strong coupling N(*)N(*)

K. Azizi; Y. Sarac; H. Sundu

doi:10.1140/epja/i2016-16114-2

EPJ

On the strong coupling N^(*)N^(*) $Mathematical equation: $\pi$$

K. Azizi¹^*, Y. Sarac² and H. Sundu³

¹ Department of Physics, Doğuş University, Acıbadem-Kadıköy, 34722, Istanbul, Turkey
² Electrical and Electronics Engineering Department, Atilim University, 06836, Ankara, Turkey
³ Department of Physics, Kocaeli University, 41380, Izmit, Turkey

^* e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Received: 17 November 2015
Accepted: 21 February 2016
Published online: 26 April 2016

Abstract

We study the strong vertices $Mathematical equation: $ N^{*}N\pi$$ , $Mathematical equation: $ N^{*}N^{*}\pi$$ and $Mathematical equation: $ NN\pi$$ in QCD, where $Mathematical equation: $ N^{*}$$ denotes the negative-parity Mathematical equation: $ N(1535)$

state. We use the most general form of the interpolating currents to calculate the corresponding strong coupling constants. It is obtained that the coupling associated to $Mathematical equation: $ N^{*}N\pi$$ vertex is strongly suppressed compared to those related to two other vertices. The strong coupling corresponding to $Mathematical equation: $ N^{*}N^{*}\pi$$ is obtained to be roughly half of that of $Mathematical equation: $ NN\pi$$ vertex. We compare the obtained results on $Mathematical equation: $ N^{*}N\pi$$ and $Mathematical equation: $ NN\pi$$ vertices with the existing predictions of other theoretical studies as well as those extracted from the experimental data.

International School of Cosmic Ray Astrophysics
24th Course: “Particles and the Cosmos”
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EPJ

On the strong coupling N^()N^() $Mathematical equation: $\pi$$

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