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E.J. Sacharidis W. Blum H. Dietl G. Grayer G. Hentschel W. Koch E. Lorenz G. Lütjens G. Lutz W. Männer J. Meissburger R. Richter U. Stierlin V. Chabaud C. Jones P. Weilhammer W. Hoogland 《Nuclear Physics B》1981,179(1):9-32
We have measured 618 K+p → π+KS0p events at 12.7 GeV/c incident lab momentum, mass range 790 ? mπ+Ks0 ? 990 MeV and t range 0.01 ? ?t ? 0.60 (GeV/c)2. The π+KS0 mass spectrum is dominated by the K1+ (892) resonance and a Breit-Wigner fit yields a mass m = 893.5 ± 1.1 MeV and a width Γ = 33.2 ± 4.1 MeV which is much narrower than measured hitherto. The t distribution of K1+ (892) events shows a dip in the forward direction and an exponential fall off thereafter, consistent with dominance of helicity flip amplitudes. The spin density matrix is almost saturated by ρ11 and ρ1?1 which are very close to their maximum allowed value of throughout the measured t range except in the very forward direction where ρ00 and Re ρ10 deviate from zero. Natural parity exchanges, therefore, dominate with unnatural parity exchanges being restricted to a small region in the forward direction. A Regge pole analysis of the differential cross sections of the present measurement in conjunction with previously measured total cross sections supports the f-coupled-pomeron hypothesis. 相似文献
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BłAŻEJ JAN WRÓBEL 《Proceedings Mathematical Sciences》2011,121(1):45-75
We examine weighted L
p
boundedness of g-functions based on semigroups related to multi-dimensional Laguerre function expansions of Hermite type. A technique of vector-valued
Calderón–Zygmund operators is used. 相似文献
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