Measurement of differential cross sections for Sigma(+) p elastic scattering in the momentum range 0.44-0.80 GeV/c

초록

We performed a novel Sigma(+)p scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 Sigma(+)p elastic scattering events were identified from 4.9 x 10(7) tagged Sigma(+) particles in the Sigma(+) momentum range 0.44-0.80 GeV/c. The differential cross sections of the Sigma(+) p elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the S-3(1) and P-1(1) channels for the first time. The phase shift of the S-3(1) channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated as 20 degrees < vertical bar delta(3) (S1)vertical bar < 35 degrees.

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