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pro vyhledávání: '"Nikolay Kivel"'
Autor:
Nikolay Kivel
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 7, Pp 1-36 (2024)
Abstract We study χ cJ → VV decays using the QCD effective field theory approach. The helicity suppressed decay amplitudes are also considered. The colour-singlet contributions of these amplitudes suffer from the endpoint singularities, it is show
Externí odkaz:
https://doaj.org/article/87c0088b938c4a6881d12fc285b08b54
Autor:
Nikolay Kivel
Publikováno v:
Physical Review D. 107
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8f3e9d74e7c13cf7199d86d7a7f07b93
https://doi.org/10.1103/physrevd.107.094015
https://doi.org/10.1103/physrevd.107.094015
Autor:
Nikolay Kivel
Publikováno v:
Physical Review D. 107
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9ab1887c8c8bb7ab4fbd4a343229e314
https://doi.org/10.1103/physrevd.107.054026
https://doi.org/10.1103/physrevd.107.054026
Autor:
Nikolay Kivel
Decays $J/\psi\to B\bar B$ into octet baryon-antibaryons pairs are studied within the QCD factorisation framework. The next-to-leading power correction to the leading-order decay amplitude is calculated for the first time. The phenomenological analys
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c0898174d9bb8e8abc11333fe0e564dc
http://arxiv.org/abs/2203.00377
http://arxiv.org/abs/2203.00377
Autor:
Nikolay Kivel
We investigate $J/\psi$ decays into octet baryon-antibaryons pairs. The decay amplitudes are computed within the collinear QCD factorisation framework. The subleading amplitude, which describes the decay of longitudinally polarised charmonium, is com
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9c149201676fe6a7213da950b1b2edcf
http://arxiv.org/abs/2109.05847
http://arxiv.org/abs/2109.05847
Autor:
Nikolay Kivel
Publikováno v:
The European Physical Journal A. 57
Few typos and two mistakes has been found in the text of the published version of the paper. Unfortunately these errors provide a strong impact on the numerical results and therefore some of the discussed observations has been changed. The updated te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bc690ddb2afb20062e2a0ee1923e6329
https://doi.org/10.1140/epja/s10050-021-00575-9
https://doi.org/10.1140/epja/s10050-021-00575-9
Autor:
Nikolay Kivel
Publikováno v:
The European Physical Journal A. 56
The power suppressed amplitude which describes the Pauli ($\sigma^{\mu\nu}$) coupling in the $J/\psi\to p\bar p$ decay is calculated within the effective field theory framework. It is shown that at the leading-order approximation this contribution is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f47d2b0418980f4f594bdeb98916bab
https://doi.org/10.1140/epja/s10050-020-00064-5
https://doi.org/10.1140/epja/s10050-020-00064-5
Autor:
Nikolay Kivel
Publikováno v:
The European Physical Journal A. 54
We study hadronic decays $ \chi_{cJ}\rightarrow K^{\ast}(892)\bar{K}$ within the effective field theory framework. We consider the colour-singlet and colour-octet contributions and study their properties using (p)NRQCD effective theory. We show that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9fc599610a520a64a29a7d526900f96e
https://doi.org/10.1140/epja/i2018-12582-6
https://doi.org/10.1140/epja/i2018-12582-6
Autor:
Nikolay Kivel
Publikováno v:
Proceedings of Sixth International Conference on Quarks and Nuclear Physics — PoS(QNP2012).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6083afc8adbce39729035ffc696c3d4
https://doi.org/10.22323/1.157.0140
https://doi.org/10.22323/1.157.0140
Autor:
Nikolay Kivel
Publikováno v:
EPJ Web of Conferences, Vol 112, p 01011 (2016)
Existing data for the electromagnetic proton form factors and for the cross section of the wide angle Compton scattering (WACS) show that the hard two-gluon exchange mechanism (collinear factorization) is still not applicable in the kinematical regio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bc14b59fc72b61981aeb351360844cc3
https://doi.org/10.1051/epjconf/201611201011
https://doi.org/10.1051/epjconf/201611201011