Probing SU(2) symmetry breaking in the nucleon sea
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Data
1997-05-29
Autores
Arash, Firooz [UNESP]
Tomio, Lauro [UNESP]
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Resumo
Investigation of invariant cross-sections for production of K*- and K*0, in the fragmentation region of the proton, in p - p and γ - p reactions, gives a direct and unambiguous probe to the symmetry breaking of the nucleon sea. Based on existing data, we clearly found a large asymmetry of the sea. Our result is in excellent agreement with NA51 measurement, signaling lack of any nuclear effect. The measurement can be carried out in a single experimental set up. The ratio K*-/K*0 is equivalent to ū/d̄, with easy access to the x-dependence of the asymmetry. The observed asymmetry from available experimental data is used to improve the valon-recombination model. © 1997 Elsevier Science B.V.
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Experimental tests, Flavor symmetries, Meson production, Quark models
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 401, n. 3-4, p. 207-212, 1997.