| Project/Area Number |
26800135
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
|
|---|
| Research Institution | Kyoto University |
|---|
Principal Investigator |
Hatta Yoshitaka 京都大学, 基礎物理学研究所, 准教授 (00512534)
|
|---|
| Project Period (FY) |
2014-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| Budget Amount *help |
¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
|
|---|
| Keywords | Quantum Chromodynamics / perturbation theory / resummation / nonglobal logarithms / nonglobal logarithm / QCD / Resummation in QCD / Nonglobal logarithms |
|---|
| Outline of Final Research Achievements |
Naive perturbative expansion in QCD often breaks down due to large logarithms originating from infrared divergences. These logarithms must be resummed to all orders. In this research, we performed the resummation of the so-called nonglobal logarithms for hemisphere jet mass distribution in electron-positron annihilation including finite-Nc effects. The nonglobal logarithms originate from the soft gluon emissions, and only arise when the measurement is restricted to a part of the phase space. Before our work, this resummation has only been carried out in the large-Nc approximation or in fixed-order perturbation theory. We have for the first time succeeded in carrying out the resummation for the physical value of the color, namely, Nc=3. Our result shows that the finite-Nc effects is sizable, especially when the shape variable becomes small.
|
