Confirmation of the 1⁻⁺ meson exotics in the ηπ⁰ system

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• 作者：G.S. Adams ; T. Adams ; Z. Bar-Yam ; J.M. Bishop ; V.A. Bodyagin ; D.S. Brown ; N.M. Cason ; S.U. Chung ; J.P. Cummings ; A.I. Demianov ; K. Danyo ; J.P. Dowd ; P. Eugenio ; X.L. Fan ; A.M. Gribushin ; R.W. Hackenbu
• 关键词：Meson spectroscopy ; Exotic mesons
• 刊名：Physics Letters B
• 出版年：2007
• 出版时间：29 November 2007
• 年：2007
• 卷：657
• 期：1-3
• 页码：27-31
• 全文大小：381 K

文摘

The exclusive reaction <a name=""mml12"">a><a style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4PD4XBH-1&_mathId=mml12&_user=10&_cdi=5539&_rdoc=6&_acct=C000050221&_version=1&_userid=10&md5=5299464e8a6a352164437320b85ef0c9"" title=""Click to view the MathML source"">π⁻p→ηπ⁰na>, <a name=""mml13"">a><a style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4PD4XBH-1&_mathId=mml13&_user=10&_cdi=5539&_rdoc=6&_acct=C000050221&_version=1&_userid=10&md5=d7e61ee3a155e94ea7344e48d1a61db4"" title=""Click to view the MathML source"">η→π⁺π⁻π⁰a> at <a name=""mml14"">a><a href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4PD4XBH-1&_mathId=mml14&_user=10&_cdi=5539&_rdoc=6&_acct=C000050221&_version=1&_userid=10&md5=0b10f1e5e118dff73b12fdd3e06bb2ef"">ache/MiamiImageURL/B6TVN-4PD4XBH-1-58/0?wchp=dGLzVlz-zSkWA"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=14 width=65>a> has been studied with a partial wave analysis on a sample of 23 492 <a name=""mml15"">a><a style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4PD4XBH-1&_mathId=mml15&_user=10&_cdi=5539&_rdoc=6&_acct=C000050221&_version=1&_userid=10&md5=60de73460d510108f42cab59eed53e28"" title=""Click to view the MathML source"">ηπ⁰na> events from BNL experiment E852. A mass-dependent fit is consistent with a resonant hypothesis for the <a name=""mml16"">a><a style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4PD4XBH-1&_mathId=mml16&_user=10&_cdi=5539&_rdoc=6&_acct=C000050221&_version=1&_userid=10&md5=1a9c424f51431b132b78b5f51924c7aa"" title=""Click to view the MathML source"">P₊a> wave, thus providing evidence for a neutral exotic meson with <a name=""mml17"">a><a style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4PD4XBH-1&_mathId=mml17&_user=10&_cdi=5539&_rdoc=6&_acct=C000050221&_version=1&_userid=10&md5=ef24b5497577395be571aff340797d7d"" title=""Click to view the MathML source"">J^PC=1⁻⁺a>, a mass of <a name=""mml18"">a><a href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4PD4XBH-1&_mathId=mml18&_user=10&_cdi=5539&_rdoc=6&_acct=C000050221&_version=1&_userid=10&md5=9aaa8865d41ac2a56070938cc1e87470"">ache/MiamiImageURL/B6TVN-4PD4XBH-1-6V/0?wchp=dGLzVlz-zSkWA"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=17 width=160>a>, and a width of <a name=""mml19"">a><a href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4PD4XBH-1&_mathId=mml19&_user=10&_cdi=5539&_rdoc=6&_acct=C000050221&_version=1&_userid=10&md5=de10592fcc38fa5c2a6c8f5eaa1bcde1"">ache/MiamiImageURL/B6TVN-4PD4XBH-1-V/0?wchp=dGLzVlz-zSkWA"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=17 width=153>a>. New interpretations of the meson exotics in neutral <a name=""mml20"">a><a style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4PD4XBH-1&_mathId=mml20&_user=10&_cdi=5539&_rdoc=6&_acct=C000050221&_version=1&_userid=10&md5=e44a25761b1da6e39ef168565c61145a"" title=""Click to view the MathML source"">ηπ⁰a> system observed in E852 and Crystal Barrel experiments are discussed.