Production mechanism of heavy quarks for hadron - hadron and electron - positron collisisons
| Project/Area Number |
59420007
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | Faculty of Science, Tokyo Metropolitan University |
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Principal Investigator |
HIROSE Tachishige Faculty of Science, Tokyo Metropolitan University Associate Professor, 理学部, 助教授 (70087162)
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| Co-Investigator(Kenkyū-buntansha) |
CHIBA Masami Faculty of Science,Tokyo Metropolitan University, Assistant, 理学部, 助手 (60128577)
KITAMURA Shoichi Faculty of Science,Tokyo Metropolitan University, Assistant, 理学部, 助手 (60106599)
HAMATSU Ryosuke Faculty of Science,Tokyo Metropolitan University, Assistant, 理学部, 助手 (20087092)
YAMAGATA Taketora Faculty of Science,Tokyo Metropolitan University, Professor, 理学部, 教授 (90086984)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥34,800,000 (Direct Cost: ¥34,800,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1985: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1984: ¥32,800,000 (Direct Cost: ¥32,800,000)
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| Keywords | diquark / hadronization of a quark / cascade model / string model charmed particle / proton - nucleus collision / 陽子-原子核反応 / ルミノシティーモニター / 飛跡認識 / ハドロン化 / 二重クォーク |
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| Research Abstract |
1. Confirmation of a diquark and the construction of a quark - diquark model.
In order to clarify reaction mechanisms of soft hadronic processes, we adopted the cascade model and the string model whose parameters were fixed from the comparison of the model predictions with data of <e^+> + <e^-> <Forward Arrow> hadrons. Concerning the quark structure of a proton, we assume two viewpoints ; ( <i> ) three independent quarks and ( <ii> ) a single quark and a diquark. The momentum distribution of the quark (or diquark) was formulated on the basis of two viewpoints and then coupled to each hadronization model. It was found that the model with the diquark could describe fairly well all single particle distributions of P+P <Forward Arrow> hadron + X at 360 GeV/c while the model without the diquark showed large deviation from the <X_F> (Feyman variable) distributions especially for the baryon production i.e. P+P <Forward Arrow> <LAMBDA> +X, P+X, <DELTA^(++)> +X.
2. The EHS experiments has provided us single particle distributions of various reaction channels. The lifetimes of charmed particles D゜, <D^> +!- <> , <LAMBDA_c> were measured Proton - nucleus collisions, i. e. p+Al and p+Au were also observed and the results were compared with the multi - chain model.
3. Construction of the luminosity monitor and development of track finding algorithm for the VENUS detector of TRISTAN.
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Report
(2 results)
Research Products
(10 results)
