We have measured the cross section for π^＋π^- production in two-photon collisions using a data sample with an integrated luminosity of 85.9 fb^-1 collected with the Belle detector. The f0（980） resonance is observ...We have measured the cross section for π^＋π^- production in two-photon collisions using a data sample with an integrated luminosity of 85.9 fb^-1 collected with the Belle detector. The f0（980） resonance is observed as a peak in the energy spectrum of the cross section. We also report preliminary results for γγ→ π^0π^0 with two-photon center-of-mass energies ranging from 0.6 to 4.0 GeV, based on a 95 fb-1 data sample. We find at least four resonant structures including a peak from f0（980）. In addition, there is evidence for Xc0 production. We also make a preliminary discussion of the angular dependence and cross section ratio of γγ →π^＋π^- and γγ→π^oπ^o.展开更多
We review recent measurements of pure neutral final state production in the two-photon processes, γγ→π^0π^0 and ηπ^0 at the Belle experiment. In the lower invariant mass region, properties of light scalar meson...We review recent measurements of pure neutral final state production in the two-photon processes, γγ→π^0π^0 and ηπ^0 at the Belle experiment. In the lower invariant mass region, properties of light scalar mesons are measured by partial wave analysis. In the higher energy region the total and differential cross section are compared with QCD models.展开更多
A new fluorescent sensor (1) for Pb2+ containing a 1,4-dicyano-2,5-bis(styryl)benzene fluorophore and 2-(N,N’-bis(carboxylmethyl))amino-1-carboxylmethoxylbenzene as receptor has been synthesized. The sensor selective...A new fluorescent sensor (1) for Pb2+ containing a 1,4-dicyano-2,5-bis(styryl)benzene fluorophore and 2-(N,N’-bis(carboxylmethyl))amino-1-carboxylmethoxylbenzene as receptor has been synthesized. The sensor selectively responds to Pb2+ in the aqueous environment, and brings about similar and significant changes in one- and two-photon excited emission spectra: λmax red-shift from 460 (519) to 590 nm. The selective response is pH-independent in a large physiological pH range, and two-photon action cross section (Φδ ) is 51 GM (1 GM = 1×10-50 cm4·s·photon-1·molecule-1) at 740 nm.展开更多
文摘We have measured the cross section for π^＋π^- production in two-photon collisions using a data sample with an integrated luminosity of 85.9 fb^-1 collected with the Belle detector. The f0（980） resonance is observed as a peak in the energy spectrum of the cross section. We also report preliminary results for γγ→ π^0π^0 with two-photon center-of-mass energies ranging from 0.6 to 4.0 GeV, based on a 95 fb-1 data sample. We find at least four resonant structures including a peak from f0（980）. In addition, there is evidence for Xc0 production. We also make a preliminary discussion of the angular dependence and cross section ratio of γγ →π^＋π^- and γγ→π^oπ^o.
文摘We review recent measurements of pure neutral final state production in the two-photon processes, γγ→π^0π^0 and ηπ^0 at the Belle experiment. In the lower invariant mass region, properties of light scalar mesons are measured by partial wave analysis. In the higher energy region the total and differential cross section are compared with QCD models.
基金Supported by the National Natural Science Foundation of China (Grant Nos. 20705621 & 20706008)the National Basic Research Project of China (Grant No. 2009CB724706)+1 种基金the Ministry of Education of China, Changjiang Scholars Innovative Research Team in University (Grant No. IRT0711)Cultivation Fund of the Key Scientific and Technical Innovation Project (Grant No. 707016)
文摘A new fluorescent sensor (1) for Pb2+ containing a 1,4-dicyano-2,5-bis(styryl)benzene fluorophore and 2-(N,N’-bis(carboxylmethyl))amino-1-carboxylmethoxylbenzene as receptor has been synthesized. The sensor selectively responds to Pb2+ in the aqueous environment, and brings about similar and significant changes in one- and two-photon excited emission spectra: λmax red-shift from 460 (519) to 590 nm. The selective response is pH-independent in a large physiological pH range, and two-photon action cross section (Φδ ) is 51 GM (1 GM = 1×10-50 cm4·s·photon-1·molecule-1) at 740 nm.
