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 |
Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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Research Institution | Juntendo University |
Principal Investigator |
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Project Period (FY) |
2013-04-01 – 2017-03-31
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Project Status |
Completed (Fiscal Year 2016)
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Budget Amount *help |
¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
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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 / ツイスト3 / QCD / QCD因子化 |
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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Report
(5 results)
Research Products
(45 results)
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[Presentation] γ→V impact factor in QCD2017
Author(s)
Kazuhiro Tanaka
Organizer
INT Workshop on "Probing QCD in Photon-Nucleus Interactions at RHIC and LHC: the Path to EIC" (INT-17-65W)
Place of Presentation
Institute for Nuclear Theory, Seattle, USA
Year and Date
2017-02-13
Related Report
Int'l Joint Research
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[Presentation] Exclusive Drell-Yan process2017
Author(s)
Kazuhiro Tanaka
Organizer
Workshop on hadron tomography at J-PARC and KEKB
Place of Presentation
High Energy Accelerator Research Organization (KEK), Tsukuba, Japan
Related Report
Int'l Joint Research / Invited
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[Presentation] High-energy hadron physics at J-PARC2015
Author(s)
K. Tanaka
Organizer
KEK theory center workshop on Hadron physics with high-momentum hadron beams at J-PARC in 2015
Place of Presentation
High Energy Accelerator Research Organization (KEK), Tsukuba, Japan
Year and Date
2015-03-13 – 2015-03-16
Related Report
Invited
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[Presentation] High-energy hadron physics at J-PARC2014
Author(s)
K. Tanaka
Organizer
4th Joint Meeting of the Nuclear Physics Divisions of the American Physical Society and the Physical Society of Japan
Place of Presentation
Hilton Waikaoloa Village, Hawaii Island, USA
Year and Date
2014-10-07 – 2014-10-11
Related Report
Invited
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[Presentation] Transverse-spin gluon distribution function2014
Author(s)
K. Tanaka
Organizer
4th Joint Meeting of the Nuclear Physics Divisions of the American Physical Society and the Physical Society of Japan
Place of Presentation
Hilton Waikaoloa Village, Hawaii Island, USA
Year and Date
2014-10-07 – 2014-10-11
Related Report
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