We study prompt hadroproduction of the charged bottomonium-like states Zb± （10610） and Zb±（10650）, and the charged eharmonium-like states Zc± （3900） and Zc± （4020）, at the Tevatron and the ...We study prompt hadroproduction of the charged bottomonium-like states Zb± （10610） and Zb±（10650）, and the charged eharmonium-like states Zc± （3900） and Zc± （4020）, at the Tevatron and the LHC, provided that these states are S-wave hadronic molecules. Using two Monte Carlo event generators, Herwig and Pythia, to simulate the production of heavy meson pairs, we derive an order-of-magnitude estimate of the production rates for these four particles. Our estimates yield a cross section at the nb level for the Zb（10610） and Zb（10650）. The results for the Zc（3900） and Zc （4020） are larger by a factor of 2~30. These cross sections are large enough to be observed, and measurements at hadron colliders in the future will supplement the study using electron-positron collisions, and therefore allow to explore the mysterious nature of these exotic states.展开更多
The A（1405） resonance emerges in the meson-baryon scattering amplitude with the strangeness S = - 1 and isospin I = 0. It is the archetype of what is called a dynamically generated resonance, as pioneered by Dalitz ...The A（1405） resonance emerges in the meson-baryon scattering amplitude with the strangeness S = - 1 and isospin I = 0. It is the archetype of what is called a dynamically generated resonance, as pioneered by Dalitz and Tuan [1]. The most powerful and systematic approach for the low-energy regime of the strong interactions is chiral perturbation theory （ChPT）, see e.g. Ref. 2. A perturbative calculation is, however, not applicable to this sector because of the existence of the A（1405） just below the KN threshold. In this case, ChPT has to be combined with a non-perturbative resummation technique, just as in the case of the nuclear forces. By solving the Lippmann- Schwinger equation with the interaction kernel determined by ChPT and using a particular regularization, in Ref. 3 a successful description of the low-energy K-p scattering data as well as the mass distribution of the A（1405） was achieved （for further developments, see Ref. 4 and references therein）.展开更多
基金Supported in part by the DFG and the NSFC through funds provided to the Sino-German CRC 110 ＂Symmetries and the Emergence of Structure in QCD＂, and by the NSFC under Grant No. 11165005
文摘We study prompt hadroproduction of the charged bottomonium-like states Zb± （10610） and Zb±（10650）, and the charged eharmonium-like states Zc± （3900） and Zc± （4020）, at the Tevatron and the LHC, provided that these states are S-wave hadronic molecules. Using two Monte Carlo event generators, Herwig and Pythia, to simulate the production of heavy meson pairs, we derive an order-of-magnitude estimate of the production rates for these four particles. Our estimates yield a cross section at the nb level for the Zb（10610） and Zb（10650）. The results for the Zc（3900） and Zc （4020） are larger by a factor of 2~30. These cross sections are large enough to be observed, and measurements at hadron colliders in the future will supplement the study using electron-positron collisions, and therefore allow to explore the mysterious nature of these exotic states.
文摘The A（1405） resonance emerges in the meson-baryon scattering amplitude with the strangeness S = - 1 and isospin I = 0. It is the archetype of what is called a dynamically generated resonance, as pioneered by Dalitz and Tuan [1]. The most powerful and systematic approach for the low-energy regime of the strong interactions is chiral perturbation theory （ChPT）, see e.g. Ref. 2. A perturbative calculation is, however, not applicable to this sector because of the existence of the A（1405） just below the KN threshold. In this case, ChPT has to be combined with a non-perturbative resummation technique, just as in the case of the nuclear forces. By solving the Lippmann- Schwinger equation with the interaction kernel determined by ChPT and using a particular regularization, in Ref. 3 a successful description of the low-energy K-p scattering data as well as the mass distribution of the A（1405） was achieved （for further developments, see Ref. 4 and references therein）.
