ar X iv : h ep - p h / 01 04 25 3 v 1 2 4 A pr 2 00 1 Production of the η b ( nS ) states 1
نویسنده
چکیده
The rates for magnetic dipole (M1) transitions Υ(nS) → ηb(n S) + γ, n ≤ n, are compared. The photon energies for allowed (n = n) M1 transitions are very small, so hindered (n < n) transitions could be more favorable for discovering the ηb(1S, 2S). The question then arises whether Υ(2S) or Υ(3S) is a better source of ηb(1S). Whereas one nonrelativistic model favors ηb(1S) production from Υ(2S), this advantage is lost when relativistic corrections are taken into account, and is not common to all sets of wave functions even in the purely nonrelativistic limit. Thus, the prospects for discovering ηb(1S) in Υ(3S) radiative decays could be comparable to those in Υ(2S) decays. We also discuss a suggestion for discovering the ηb via Υ(3S) → hb( P1)ππ, followed by hb → ηbγ.
منابع مشابه
ar X iv : h ep - p h / 01 04 25 3 v 2 2 6 A pr 2 00 1 Production of the η b ( nS ) states 1
The rates for magnetic dipole (M1) transitions Υ(nS) → ηb(n S) + γ, n ≤ n, are compared. The photon energies for allowed (n = n) M1 transitions are very small, so hindered (n < n) transitions could be more favorable for discovering the ηb(1S, 2S). The question then arises whether Υ(2S) or Υ(3S) is a better source of ηb(1S). Whereas one nonrelativistic model favors ηb(1S) production from Υ(2S), ...
متن کاملar X iv : h ep - p h / 04 05 03 9 v 1 5 M ay 2 00 4 η , η ′ → π + π − γ with coupled channels
متن کامل
ar X iv : h ep - t h / 01 04 16 1 v 1 1 9 A pr 2 00 1 Gravitating monopoles in SU ( 3 ) gauge theory
We consider the Einstein-Yang-Mills-Higgs equations for an SU(3) gauge group in a spherically symmetric ansatz. Several properties of the gravitating monopole solutions are obtained an compared with their SU(2) counterpart.
متن کاملar X iv : h ep - p h / 01 04 25 3 v 3 2 5 M ay 2 00 1 Production of the η b ( nS ) states 1
The rates for magnetic dipole (M1) transitions Υ(nS) → ηb(n S) + γ, n ≤ n, are compared. The photon energies for allowed (n = n) M1 transitions are very small, so hindered (n < n) transitions could be more favorable for discovering the ηb(1S, 2S). The question then arises whether Υ(2S) or Υ(3S) is a better source of ηb(1S). Whereas one nonrelativistic model favors ηb(1S) production from Υ(2S), ...
متن کاملar X iv : h ep - p h / 01 04 19 6 v 2 2 2 A pr 2 00 1 DIFFRACTION AT HERA
A review is presented of diffraction studies at HERA. a a Talk given at the First Workshop on Forward Physics and Luminosity Determination at the LHC, Helsinki, Finland, November 2000.
متن کامل