International Workshop
"The Structure and Dynamics of Hadrons"
Hirschegg, Kleinwalsertal, Austria -
Information

Title:	Dr.
Family Name:	Cao
First Name:	Xu
Gender:	male
E-Mail:	caoxuimpcas.ac.cn
Affiliation for Badge:	IMP, Lanzhou
Institute:
Address (Street):	Theory Division, 19B YuquanLu, Shijingshan District
Postal Code, City:	Beijing, 100049
Country:	China
Phone:	86-13051561619
Fax:
Arrival Date:	January 15
Departure Date:	January 22
	0
Accommodation:
Room Type:
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Author(s):	Xu Cao, Bing-Song Zou, Hu-Shan Xu
Institute(s):	Institute of Modern Physics, Lanzhou, China
Title of talk:	Double pion production in $NN$ and $\bar{N}N$ collisions
Abstract:	With an effective Lagrangian approach, we give a full analysis on the $NN \to NN\pi\pi$ and $\bar{N}N\to \bar{N}N\pi\pi$ reactions by exploring the roles of various resonances with mass up to 1.72 GeV. We find large contributions from $\Delta$, $N^*(1440)$, $\Delta(1600)$ and $\Delta(1620)$ resonances. Our calculations also indicate sizeable contributions from nucleon poles for the energies close to the threshold. A good description to the existing data of different isospin channels of $NN\to NN\pi\pi$ and $\bar{N}N\to \bar{N}N\pi\pi$ for beam energies up to 2.2 GeV is reached. Our results provide important implications to the ABC effect and guildlines to the future experimental projects at COSY, HADES and HIRFL-CSR. We point out that the \={P}ANDA at FAIR could be an essential place for studying the properties of baryon resonances and the data with baryon and anti-baryon in final states are worth analyzing.
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