Comparison of coupling constant by using momentum spectra and event shape variables in different interactions
| Autor: | R. Saleh-Moghaddam, Mohammad Ebrahim Zomorrodian |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Quantum chromodynamics Coupling constant 010308 nuclear & particles physics General Physics and Astronomy 01 natural sciences Spectral line Momentum Renormalization 0103 physical sciences Strong coupling Statistical physics 010306 general physics Constant (mathematics) Event (particle physics) |
| Zdroj: | Canadian Journal of Physics. 98:900-906 |
| ISSN: | 1208-6045 0008-4204 |
| DOI: | 10.1139/cjp-2019-0080 |
| Popis: | We describe in this paper the quantum chromodynamics prediction to calculate the strong coupling constant by using event shape variables as well as momentum spectra. By fitting the dispersive model and employing our parameters on event shape distribution, we obtain the perturbative value of [Formula: see text] = 0.1305 ± 0.0474 and also the non-perturbative value of α0 = 0.5246 ± 0.0516 GeV for electron–proton interactions. Next, by using momentum spectra for the same interactions, we obtain αs = 0.1572 ± 0.029. Our values in both methods are consistent with those obtained from electron–positron annihilations measured previously. When we find coupling constant for different flavours, we observe that they do not affect our results considerably. This is in accordance with quantum chromodynamics theory. All these features will be explained in the main text. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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