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Phenomenological analysis of associated production of $Z^0+b$ in the $b \rightarrow J/\psi X$ decay channel at the LHC
The ATLAS collaboration recently reported on the first observation of associated-production of a Z0 boson with a J/ψ . We recently claimed that the corresponding yield of the prompt J/ψ was dominated by double parton scatterings in the ATLAS acceptance with a somewhat small value of σeff . We also f...
Autores principales: | , |
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Lenguaje: | eng |
Publicado: |
2016
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/j.nuclphysb.2017.01.002 http://cds.cern.ch/record/2236670 |
_version_ | 1780952836169793536 |
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author | Lansberg, Jean-Philippe Shao, Hua-Sheng |
author_facet | Lansberg, Jean-Philippe Shao, Hua-Sheng |
author_sort | Lansberg, Jean-Philippe |
collection | CERN |
description | The ATLAS collaboration recently reported on the first observation of associated-production of a Z0 boson with a J/ψ . We recently claimed that the corresponding yield of the prompt J/ψ was dominated by double parton scatterings in the ATLAS acceptance with a somewhat small value of σeff . We also found out that single parton scatterings were only dominant at large transverse momenta. We present here the first phenomenological analysis of another part of the ATLAS data sample, namely of a Z0 boson plus a non-prompt J/ψ . Our study is performed at next-to-leading order in αs and includes parton-shower effects via the MadGraph 5_ aMC@NLO framework. We find out that the data, unlike the case of prompt J/ψ+Z0 , do not hint at significant DPS contributions. Owing to the current experimental and theoretical uncertainties, there is still a room for these but with a lower limit of σeff close to 5 mb. We stress the importance of QCD corrections to account for the ATLAS data. |
id | cern-2236670 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2016 |
record_format | invenio |
spelling | cern-22366702022-08-10T12:31:15Zdoi:10.1016/j.nuclphysb.2017.01.002http://cds.cern.ch/record/2236670engLansberg, Jean-PhilippeShao, Hua-ShengPhenomenological analysis of associated production of $Z^0+b$ in the $b \rightarrow J/\psi X$ decay channel at the LHCnucl-thNuclear Physics - Experimenthep-exParticle Physics - Experimenthep-phParticle Physics - Phenomenologynucl-exNuclear Physics - TheoryThe ATLAS collaboration recently reported on the first observation of associated-production of a Z0 boson with a J/ψ . We recently claimed that the corresponding yield of the prompt J/ψ was dominated by double parton scatterings in the ATLAS acceptance with a somewhat small value of σeff . We also found out that single parton scatterings were only dominant at large transverse momenta. We present here the first phenomenological analysis of another part of the ATLAS data sample, namely of a Z0 boson plus a non-prompt J/ψ . Our study is performed at next-to-leading order in αs and includes parton-shower effects via the MadGraph 5_ aMC@NLO framework. We find out that the data, unlike the case of prompt J/ψ+Z0 , do not hint at significant DPS contributions. Owing to the current experimental and theoretical uncertainties, there is still a room for these but with a lower limit of σeff close to 5 mb. We stress the importance of QCD corrections to account for the ATLAS data.The ATLAS collaboration recently reported on the first observation of associated-production of a $Z^0$ boson with a $J/\psi$. We recently claimed that the corresponding yield of the {\it prompt} $J/\psi$ was dominated by double parton scatterings in the ATLAS acceptance with a somewhat small value of $\sigma_{\rm eff}$. We also found out that single parton scatterings were only dominant at large transverse momenta. We present here the first phenomenological analysis of another part of the ATLAS data sample, namely of a $Z^0$ boson plus a {\it non-prompt} $J/\psi$. Our study is performed at next-to-leading order in $\alpha_s$ and includes parton-shower effects via the {\sc\small MadGraph5_aMC@NLO} framework. We find out that the data, unlike the case of prompt $J/\psi+Z^0$, do not hint at significant DPS contributions. Owing to the current experimental and theoretical uncertainties, there is still a room for these but with a lower limit of $\sigma_{\rm eff}$ close to 5 mb. We stress the importance of QCD corrections to account for the ATLAS data.CERN-TH-2016-244arXiv:1611.09303oai:cds.cern.ch:22366702016-11-28 |
spellingShingle | nucl-th Nuclear Physics - Experiment hep-ex Particle Physics - Experiment hep-ph Particle Physics - Phenomenology nucl-ex Nuclear Physics - Theory Lansberg, Jean-Philippe Shao, Hua-Sheng Phenomenological analysis of associated production of $Z^0+b$ in the $b \rightarrow J/\psi X$ decay channel at the LHC |
title | Phenomenological analysis of associated production of $Z^0+b$ in the $b \rightarrow J/\psi X$ decay channel at the LHC |
title_full | Phenomenological analysis of associated production of $Z^0+b$ in the $b \rightarrow J/\psi X$ decay channel at the LHC |
title_fullStr | Phenomenological analysis of associated production of $Z^0+b$ in the $b \rightarrow J/\psi X$ decay channel at the LHC |
title_full_unstemmed | Phenomenological analysis of associated production of $Z^0+b$ in the $b \rightarrow J/\psi X$ decay channel at the LHC |
title_short | Phenomenological analysis of associated production of $Z^0+b$ in the $b \rightarrow J/\psi X$ decay channel at the LHC |
title_sort | phenomenological analysis of associated production of $z^0+b$ in the $b \rightarrow j/\psi x$ decay channel at the lhc |
topic | nucl-th Nuclear Physics - Experiment hep-ex Particle Physics - Experiment hep-ph Particle Physics - Phenomenology nucl-ex Nuclear Physics - Theory |
url | https://dx.doi.org/10.1016/j.nuclphysb.2017.01.002 http://cds.cern.ch/record/2236670 |
work_keys_str_mv | AT lansbergjeanphilippe phenomenologicalanalysisofassociatedproductionofz0binthebrightarrowjpsixdecaychannelatthelhc AT shaohuasheng phenomenologicalanalysisofassociatedproductionofz0binthebrightarrowjpsixdecaychannelatthelhc |