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                                 Abstract:In virtue of the simple physical picture of quark combination model and the probability for the production of a qfqf of a flavor f which is given by treating the pair creation of the qq as a quantum mechanical tunneling effect, an universal mass relation for direct hadron production rates, =Aexp(-bm), is obtained without any additional assumption. It is satisfied by various high energy reactions. This universal mass relation is in agreement with a simple empirical regulation proposed recently and is independent of the mass-center energy and the process of the reactions. This suggests that the mass of hadrons is the primary factor for describing the particle multiplicities.
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                        References
	
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				| [1] | BES Collaboration
								. Experimental Study of Resonance f2(1270) in the J/ψ Hadronic Decay. Chinese Physics C,
							1993, 17(2): 97-106. |  
				| [2] | SANG Jian-Ping
								, LIU Chao-Shan
								, LIU Yong
								. Relation Between the Gap at Z=64 Subshell and the Abrupt Transition in the Region N=88~90. Chinese Physics C,
							1991, 15(2): 150-157. |  
 
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