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A study of production at energies from 2.4 to 4.0 GeV at Belle
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l46"">l46&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=ea13330ad53d942a3cf84356b3f58a5a"">p://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 fbp>−1p> data sample collected with the Belle detector at the KEKB l47"">l47&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=2f00826a08700ac1543e6bce1ea5806e"" title=""Click to view the MathML source"">ep>+p>ep>−p> 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"">l48&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=8a54724a392e593ed47fc58311228f32"">p://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"">l49&_user=10&_cdi=5539&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=e36357e4fae2ff60556f1446640ac19a"" title=""Click to view the MathML source"">γγKp>+p>Kp>−p> from Belle, we observe that the cross section ratio 4912a8d2e4bfd1a1a2e9053e"">p://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 p://www.sciencedirect.com/scidirimg/entities/223c.gif"" alt=""not, vert, similar"" border=0>0.13 to p://www.sciencedirect.com/scidirimg/entities/223c.gif"" alt=""not, vert, similar"" border=0>0.01 with increasing energy. Signals for the χc0 and χc2 charmonium states are also observed.

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