A study of production at energies from 2.4 to 4.0 GeV at Belle

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• 作者：W.T. Chen ; K. Abe ; K. Abe ; I. Adachi ; H. Aihara ; D. Anipko ; V. Aulchenko ; A.M. Bakich ; E. Barberio ; A. Bay ; I. Bedny ; U. Bitenc ; I. Bizjak ; S. Blyth ; A. Bondar ; A. Bozek ; M. Brač ; ko ; T.E. Browder
• 关键词：Two-photon collisions ; Mesons ; QCD ; Charmonium
• 刊名：Physics Letters B
• 出版年：2007
• 出版时间：19 July 2007
• 年：2007
• 卷：651
• 期：1
• 页码：15-21
• 全文大小：535 K

文摘

l46"">href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4NWWW7S-1&_mathId=mml46&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=ea13330ad53d942a3cf84356b3f58a5a"">http://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4NWWW7S-1-Y/0?wchp=dGLbVzz-zSkzk"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=20 width=42> production in two-photon collisions has been studied using a 397.6 fb⁻¹ data sample collected with the Belle detector at the KEKB l47"">href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4NWWW7S-1&_mathId=mml47&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=2f00826a08700ac1543e6bce1ea5806e"" title=""Click to view the MathML source"">e⁺e⁻ collider. For the first time the cross sections are measured in the two-photon center-of-mass energy range between 2.4 GeV and 4.0 GeV and angular range l48"">href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4NWWW7S-1&_mathId=mml48&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=8a54724a392e593ed47fc58311228f32"">http://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4NWWW7S-1-3T/0?wchp=dGLbVzz-zSkzk"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=15 width=89>. Combining the results with measurements of l49"">href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4NWWW7S-1&_mathId=mml49&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=e36357e4fae2ff60556f1446640ac19a"" title=""Click to view the MathML source"">γγ→K⁺K⁻ from Belle, we observe that the cross section ratio href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4NWWW7S-1&_mathId=mml50&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=e582adc24912a8d2e4bfd1a1a2e9053e"">http://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-4NWWW7S-1-4K/0?wchp=dGLbVzz-zSkzk"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=20 width=144> decreases from http://www.sciencedirect.com/scidirimg/entities/223c.gif"" alt=""not, vert, similar"" border=0>0.13 to http://www.sciencedirect.com/scidirimg/entities/223c.gif"" alt=""not, vert, similar"" border=0>0.01 with increasing energy. Signals for the href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4NWWW7S-1&_mathId=mml51&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=9be5ebf9950201550ee6912fd961c4d6"" title=""Click to view the MathML source"">χ_c0 and href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVN-4NWWW7S-1&_mathId=mml52&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=44865d262afd7656801b43425f5fb8f3"" title=""Click to view the MathML source"">χ_c2 charmonium states are also observed.