HYPERFINE SPLITTING OF B-MESONS AND BS PRODUCTION AT THE Y(5S)

被引：55

作者：

LEEFRANZINI, J ^{[1
]}

HEINTZ, U ^{[1
]}

LOVELOCK, DMJ ^{[1
]}

NARAIN, M ^{[1
]}

SCHAMBERGER, RD ^{[1
]}

WILLINS, J ^{[1
]}

YANAGISAWA, C ^{[1
]}

FRANZINI, P ^{[1
]}

TUTS, PM ^{[1
]}

机构：

[1] COLUMBIA UNIV,NEW YORK,NY 10027

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 65卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.65.2947

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using the Columbia University Stony Brook (CUSB-II) detector we have studied the inclusive photon spectrum from 2.9×104 (5S) decays. We observe a strong signal due to B*B decays. From this we obtain (i) the average B*-B mass difference, 46.7±0.4 MeV, (ii) the photon yield per (5S) decay, (5S)=1.09±0.06, and (iii) the average velocity of the B* 156±0.010, for a mix of nonstrange (B) and strange (Bs) B* mesons from (5S) decays. From the shape of the photon line, we find that both B and Bs mesons are produced with nearly equal values for the hyperfine splitting of the B and Bs meson systems. © 1990 The American Physical Society.

引用

页码：2947 / 2950

页数：4

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