Study of Neutral Mesons Decaying Into. Pi. . Pi. −3. Gamma. And. Pi. +. Pi. −4. Gamma. [Proposed Experiment]. PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
It is proposed to use the Charged and Neutral Spectrometer in Beam 8 to study the reactions ..pi..−p ..-->.. ..pi ... pi..−3..gamma..n and ..pi..−p ..-->.. ..pi..+..pi..−4..gamma..n at 8.5 GeV/c. Improvements to the spectrometer will allow a data collection rate 4 to 5 times better than achieved for these reactions in E-397. Of particular interest are the radiative decays eta' ..-->.. ..omega gamma.., ..omega.. ..-->.. eta..gamma.., rho ..-->.. eta..gamma..; the decay f ..-->.. ..pi../sup +/..pi..−..pi..°..pi..°, in which A1..pi.. may occur; the decay A2 ..-->.. ..omega pi../sup +/..pi..−, in connection with an isoscalar under the A2; study/search for B° and delta°; rare final states such as eta eta, eta..omega.., eta'..pi..° and eta'eta.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
It is proposed to use the Charged and Neutral Spectrometer in Beam 8 to study the reactions ..pi..−p ..-->.. ..pi ... pi..−3..gamma..n and ..pi..−p ..-->.. ..pi..+..pi..−4..gamma..n at 8.5 GeV/c. Improvements to the spectrometer will allow a data collection rate 4 to 5 times better than achieved for these reactions in E-397. Of particular interest are the radiative decays eta' ..-->.. ..omega gamma.., ..omega.. ..-->.. eta..gamma.., rho ..-->.. eta..gamma..; the decay f ..-->.. ..pi../sup +/..pi..−..pi..°..pi..°, in which A1..pi.. may occur; the decay A2 ..-->.. ..omega pi../sup +/..pi..−, in connection with an isoscalar under the A2; study/search for B° and delta°; rare final states such as eta eta, eta..omega.., eta'..pi..° and eta'eta.
Author: Publisher: ISBN: Category : Languages : en Pages : 231
Book Description
Apart from the mesons that the constituent quark model predicts, QCD allows for additional states beyond the qq system. Previous experiments have performed partial wave analysis on pion-production data and claim observation of an exotic JPC = 1-+ state decaying via p-[pi]. The g12 experiment took place at Jefferson Lab using the CLAS spectrometer, a liquid hydrogen target was used and a tagged photon beam. By studying the reactions [gamma]p → n-[pi]+[pi]+[pi]- and [gamma]p → [Delta]++[pi]+[pi]-[pi]-, the photoproduction of mesons decaying to 3-pi was studied using two different but complimentary channels. Events are selected with low four-momentum transfer to the baryon, in order to enhance one pion exchange production. For both 3-pi systems the data exhibit two intermediate decays, p-pi and f2[pi]. For the [gamma]p → n-[pi]+[pi]+[pi]- reaction over 600k events were acquired resulting in the largest 3 photoproduction dataset to date. The exotic JPC = 1-+ partial wave does not show resonant behavior and more so it is strongly consistent with a non-resonant non-interfering wave relative to a resonant [pi]2(1670). Furthermore, the partial wave analysis shows production of the a2(1320) and [pi]2(1670) mesons. For the first time we report observation of a photoproduced a1(1260) meson. For the [gamma]p → [Delta]++[pi]+[pi]-[pi]- reaction nearly 350k events were analyzed. A partial wave analysis was performed for the first time on this channel. The a1(1260), a2(1320), and the 2(1670) mesons were observed. Observation of the a1(1260) confirms the result first reported in [gamma]p → n-[pi]+[pi]+[pi]- reaction.
Author: Publisher: ISBN: Category : Research Languages : en Pages : 1428
Book Description
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
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