Why Is the (3s) Different?
Mar, 19896 pages
Published in:
- Phys.Rev.Lett. 62 (1989) 2910
Report number:
- WIS-89/10-PH,
- UH-511-668-89
Citations per year
Abstract: (APS)
The Υ(3S) is much closer than lower Υ(nS) states to BB¯ and B*B¯ thresholds. These ‘‘s-channel singularities’’ may dominate Υ(3S) decay amplitudes, while ‘‘t-channel gluonic states’’ dominant in conventional models are more important for other decays. An ‘‘s-channel’’ decay mechanism of sequential pion emission via a heavy intermediate state such as BB¯ or B*B¯ predicts a qualitatively different pion spectrum from that predicted by conventional ‘‘t-channel’’ models for Υ(3S)→Υ(nS)ππ decays and the yet unobserved Υ(3S)→Υ(1P1)ππ decay and may explain the observed disagreement between experiment and previous predictions as well as the difference between the Υ(3S) and other states.- UPSILON(10350): MODEL
- UPSILON(10350): DECAY MODES
- DECAY MODES: UPSILON(10350)
- B: PAIR PRODUCTION
- PAIR PRODUCTION: B
- THRESHOLD
- PI: SPECTRUM
- SPECTRUM: PI
- DECAY: ANGULAR DISTRIBUTION
- ANGULAR DISTRIBUTION: DECAY
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