Observation of the Hadronic Transitions χ b 1 , 2 ( 2 P ) → ω Υ ( 1 S ) ∗
نویسندگان
چکیده
The CLEO Collaboration has observed the first hadronic transition among bottomonium (bb̄) states other than the dipion transitions among vector states, Υ(nS)→ππΥ(mS). In our study of Υ(3S) decays, we find a significant signal for Υ(3S)→γωΥ(1S) that is consistent with radiative decays Υ(3S)→γχb1,2(2P ), followed by χb1,2(2P )→ωΥ(1S). The branching ratios we obtain are B(χb1(2P )→ωΥ(1S)) = 1.63 +0.35 −0.31 +0.16 −0.15% and B(χb2(2P )→ωΥ(1S)) = 1.10 +0.32 −0.28 +0.11 −0.10%, in which the first error is statistical and the second is systematic. ∗Submitted to XXI International Symposium on Lepton and Photon Interactions at High Energies, August 11-16, 2003, Fermi National Accelerator Laboratory, Batavia, IL
منابع مشابه
CLEO Results on Upsilons a
I present highlights of recent CLEO studies on the Υ(1S), Υ(2S), and Υ(3S). The preliminary results presented here include the first observation of a hadronic cascade in the Υ system not involving pions, Υ(3S) → γχ b1,2 (2P) followed by χ b1,2 (2P) → ωΥ(1S). I also present preliminary results on a search for inclusive ψ production in Υ(1S) decays. I end with a search for nine different two body...
متن کاملIs Υ ( 3 S ) a pure S − wave ?
Assuming the QCD multipole expansion is applicable to hadronic transitions of Υ(3S) into lower level bottomonia, we consider the possibility that Υ(3S) has a D−wave component. This assumption leads to a natural explanation of the ππ spectrum in Υ(3S) → Υ(1S) ππ. Consequences of this assumption on other hadronic and radiative transitions of Υ(3S) are also discussed in the same context. PACS numb...
متن کاملar X iv : 0 70 5 . 03 42 v 1 [ he p - ex ] 2 M ay 2 00 7 Υ ( 5 S ) : What has been learned and what can be learned
The Υ(5S) was discovered about 20 years ago in ee collisions at CLEO [1] and CUSB [2]. Its mass is (10865 ± 8) MeV, about 300 MeV higher than the Υ(4S) resonance, and its width of (110± 13) MeV is about five times larger than the Υ(4S) resonance. Its production cross-section was measured to be about 0.3 nb, about ten times lower than the Υ(4S) cross-section. Owing to its mass, the Υ(5S) can dec...
متن کاملLemme — — — - Weak vector and scalar potentials . Applications to Poincaré ’ s theorem and Korn ’ s inequality in Sobolev spaces with negative exponents .
In this paper, we present several results concerning vector potentials and scalar potentials with data in Sobolev spaces with negative exponents, in a not necessarily simply-connected, three-dimensional domain. We then apply these results to Poincaré’s theorem and to Korn’s inequality. 1 Weak versions of a classical theorem of Poincaré In this work, (the results of which were announced in [2]),...
متن کامل