2016 Fiscal Year Final Research Report
Unveiling novel QCD mechanism in high-energy photon-photon collision
| Project/Area Number |
25610058
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Juntendo University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Keywords | QCD / 光子・光子衝突 / エクスクルーシヴ / 光円錐波動関数 / QCD因子化 / ベクトル中間子生成 / グルーオン / QCD和則 |
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| Outline of Final Research Achievements |
Forward exclusive productions of two mesons in high-energy photon-photon collision are dominated by the transition of each photon into a forward neutral vector meson, through the virtual quark-antiquark intermediate states and the gluon exchanges between two such virtual pairs. We show that the final states with the longitudinal vector meson and transverse vector meson can be generated by the twist-3 effect in QCD, although they are not allowed by the conventional helicity selection rules. Calculating this effect by the QCD factorization is suffered by infrared divergences. We have performed a QCD calculation of the corresponding soft contributions by the light-cone sum rules based on dispersion relation and duality, and obtained a quantitative estimate of the corresponding cross section. We show that the results are not suppressed compared with those for the final states allowed by the helicity selection rules, and this prediction is to be tested by comparing with future experiments.
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| Free Research Field |
ハドロン物理、素粒子物理の理論
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