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Higgs two-gluon decay and the top-quark chromomagnetic moment
We obtain the effective interaction ${\cal L}_{hgg}$, which is driven by the fluctuations of the top quark, as a function of the top quark chromomagnetic factor $\kappa_t$. We show that for $\kappa_t\ne 2$ the Higgs-to-two gluon, $h\to gg$, decay rate is always significantly suppressed as compared t...
| Autores principales: | , |
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| Lenguaje: | eng |
| Publicado: |
2012
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| Materias: | |
| Acceso en línea: | http://cds.cern.ch/record/1484572 |
| _version_ | 1780926050262319104 |
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| author | Labun, Lance Rafelski, Johann |
| author_facet | Labun, Lance Rafelski, Johann |
| author_sort | Labun, Lance |
| collection | CERN |
| description | We obtain the effective interaction ${\cal L}_{hgg}$, which is driven by the fluctuations of the top quark, as a function of the top quark chromomagnetic factor $\kappa_t$. We show that for $\kappa_t\ne 2$ the Higgs-to-two gluon, $h\to gg$, decay rate is always significantly suppressed as compared to the standard case $\kappa_t= 2$, which would be contributing $\cal{O}$(8.5%) of the total Higgs decay width. We show that $h\to gg$ rate can vanish due to the negative interference with the bottom quark vacuum fluctuation amplitude. We discuss potential paths to obtain experimental information for the $h\to gg$ rate. |
| id | cern-1484572 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2012 |
| record_format | invenio |
| spelling | cern-14845722023-03-15T19:12:46Zhttp://cds.cern.ch/record/1484572engLabun, LanceRafelski, JohannHiggs two-gluon decay and the top-quark chromomagnetic momentParticle Physics - PhenomenologyWe obtain the effective interaction ${\cal L}_{hgg}$, which is driven by the fluctuations of the top quark, as a function of the top quark chromomagnetic factor $\kappa_t$. We show that for $\kappa_t\ne 2$ the Higgs-to-two gluon, $h\to gg$, decay rate is always significantly suppressed as compared to the standard case $\kappa_t= 2$, which would be contributing $\cal{O}$(8.5%) of the total Higgs decay width. We show that $h\to gg$ rate can vanish due to the negative interference with the bottom quark vacuum fluctuation amplitude. We discuss potential paths to obtain experimental information for the $h\to gg$ rate.We study the top quark chromomagnetic factor $\kappa_t$-dependence of the effective interaction ${\cal L}_{hgg}$ and apply the result to the case of Higgs two gluon decay rate $\Gamma_{h\to gg}$. Perturbative standard model provides $\kappa_t< 2$, and for the standard model value $\Gamma_{h\to gg}(\kappa_t)$ is suppressed by 9% as compared to $\kappa_t= 2$. We further show that in the leading order $\Gamma_{h\to gg}$ for $\kappa_t\simeq \pm 1.2$ can be very small due to complete cancelation between the top and bottom quark fluctuations. We discuss the extension of our results to $\kappa_t>2$ and consider potential paths to obtain experimental information for the $h\to gg$ rate.arXiv:1210.3150CERN-PH-TH-2012-265CERN-PH-TH-2012-265oai:cds.cern.ch:14845722012-10-12 |
| spellingShingle | Particle Physics - Phenomenology Labun, Lance Rafelski, Johann Higgs two-gluon decay and the top-quark chromomagnetic moment |
| title | Higgs two-gluon decay and the top-quark chromomagnetic moment |
| title_full | Higgs two-gluon decay and the top-quark chromomagnetic moment |
| title_fullStr | Higgs two-gluon decay and the top-quark chromomagnetic moment |
| title_full_unstemmed | Higgs two-gluon decay and the top-quark chromomagnetic moment |
| title_short | Higgs two-gluon decay and the top-quark chromomagnetic moment |
| title_sort | higgs two-gluon decay and the top-quark chromomagnetic moment |
| topic | Particle Physics - Phenomenology |
| url | http://cds.cern.ch/record/1484572 |
| work_keys_str_mv | AT labunlance higgstwogluondecayandthetopquarkchromomagneticmoment AT rafelskijohann higgstwogluondecayandthetopquarkchromomagneticmoment |