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The anomalous production of multi-lepton and its impact on the measurement of $Wh$ production at the LHC
/ Hernandez, Yesenia (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Kumar, Mukesh (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Cornell, Alan S. (Johannesburg U.) ; Dahbi, Salah-Eddine (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Fang, Yaquan (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Lieberman, Benjamin (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Mellado, Bruce (U. Witwatersrand, Johannesburg, Sch. Phys. ; iThemba LABS) ; Monnakgotla, Kgomotso (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Ruan, Xifeng (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Xin, Shuiting (Beijing, GUCAS ; Beijing, Inst. High Energy Phys.)
Anomalies in multi-lepton final states at the Large Hadron Collider (LHC) have been reported in Refs.~\cite{vonBuddenbrock:2017gvy,vonBuddenbrock:2019ajh}. These can be interpreted in terms of the production of a heavy boson, $H$, decaying into a Standard Model (SM) Higgs boson, $h$, and a singlet scalar, $S$, which is treated as a SM Higgs-like boson. [...]
arXiv:1912.00699.-
2021-04-27 - 13 p.
- Published in : Eur. Phys. J. C 81 (2021) 365
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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2.
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Accumulating evidence for the associated production of a new Higgs boson at the LHC
/ Crivellin, Andreas (Zurich U. ; PSI, Villigen ; CERN) ; Fang, Yaquan (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Fischer, Oliver (Liverpool U.) ; Bhattacharya, Srimoy (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Kumar, Mukesh (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Malwa, Elias (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Mellado, Bruce (U. Witwatersrand, Johannesburg, Sch. Phys. ; iThemba LABS) ; Rapheeha, Ntsoko (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Ruan, Xifeng (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Sha, Qiyu (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS)
In the last decades, the Standard Model (SM) of particle physics has been extensively tested and confirmed, with the announced discovery of the Higgs boson in 2012 being the last missing puzzle piece. Even though since then the search for new particles and interactions has been further intensified, the experiments ATLAS and CMS at the Large Hadron Collider (LHC) at CERN did not find evidence for the direct production of a new state. [...]
arXiv:2109.02650; ICPP-057; PSI-PR-21-21; ZU-TH 38/21; CERN-TH-2021-129; LTH 1267.-
2023-12-01 - 9 p.
- Published in : Phys. Rev. D 108 (2023) 115031
Fulltext: 2109.02650 - PDF; Publication - PDF;
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3.
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Unveiling Hidden Physics at the LHC
/ Fischer, Oliver (Liverpool U.) ; Mellado, Bruce (U. Witwatersrand, Johannesburg, Sch. Phys. ; iThemba LABS) ; Antusch, Stefan (Basel U.) ; Bagnaschi, Emanuele (PSI, Villigen) ; Banerjee, Shankha (CERN) ; Beck, Geoff (U. Witwatersrand, Johannesburg, Sch. Phys. ; iThemba LABS) ; Belfatto, Benedetta (Pisa U. ; INFN, Pisa) ; Bellis, Matthew (Siena Coll., Loudonville) ; Berezhiani, Zurab (L'Aquila U. ; INFN, Aquila) ; Blanke, Monika (KIT, Karlsruhe ; KIT, Karlsruhe, TTP) et al.
The field of particle physics is at the crossroads. The discovery of a Higgs-like boson completed the Standard Model (SM), but the lacking observation of convincing resonances Beyond the SM (BSM) offers no guidance for the future of particle physics. [...]
arXiv:2109.06065.-
2022-08-03 - 109 p.
- Published in : Eur. Phys. J. C
Fulltext: 2109.06065 - PDF; document - PDF;
In : Unveiling hidden Physics Beyond the Standard Model at the LHC, Online, 1 - 3 Mar 2021
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4.
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Radiation hardness of plastic scintillators for the Tile Calorimeter of the ATLAS detector
/ Jivan, H (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Mellado, B (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Sideras-Haddad, E (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Erasmus, R (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Liao, S (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Madhuku, M (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Peters, G (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Solvyanov, O (CERN)
The radiation damage in polyvinyl toluene based plastic scintillator EJ200 obtained from ELJEN technology was investigated. This forms part of a comparative study conducted to aid in the upgrade of the Tile Calorimeter of the ATLAS detector during which the Gap scintillators will be replaced. [...]
2015 - 7 p.
- Published in : J. Phys.: Conf. Ser. 623 (2015) 012016
IOP Open Access article: PDF;
In : Kruger2014: The International Workshop on Discovery Physics at the LHC, Skukuza, Mpumulanga, South Africa, 1 - 5 Dec 2014, pp.012016
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5.
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Radiation hardness of plastic scintillators for the Tile Calorimeter of the ATLAS detector
/ Jivan, H (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Sideras-Haddad, E (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Erasmus, R (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Liao, S (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Madhuku, M (iThemba LABS) ; Peters, G (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Sekonya, K (U. Witwatersrand, Johannesburg, Sch. Phys. ; iThemba LABS) ; Solvyanov, O (CERN)
The radiation damage in polyvinyl toluene based plastic scintillator EJ200 obtained from ELJEN technology was investigated. This forms part of a comparative study conducted to aid in the upgrade of the Tile Calorimeter of the ATLAS detector during which the Gap scintillators will be replaced. [...]
2015 - 6 p.
- Published in : J. Phys.: Conf. Ser. 645 (2015) 012019
Fulltext: PDF; IOP Open Access article: PDF;
In : Workshop on High Energy Particle Physics, Johannesburg, South Africa, 11 - 13 Feb 2015, pp.012019
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6.
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An Experiment for Electron-Hadron Scattering at the LHC
/ André, K.D. J. (CERN ; Liverpool U.) ; Aperio Bella, L. (DESY) ; Armesto, N. (Santiago de Compostela U., IGFAE) ; Bogacz, S.A. (Jefferson Lab) ; Britzger, D. (Munich, Max Planck Inst.) ; Brüning, O.S. (CERN) ; D'Onofrio, M. (Liverpool U.) ; Ferreiro, E.G. (Santiago de Compostela U., IGFAE) ; Fischer, O. (Liverpool U.) ; Gwenlan, C. (Oxford U.) et al.
Novel considerations are presented on the physics, apparatus and accelerator designs for a future, luminous, energy frontier electron-hadron ($eh$) scattering experiment at the LHC in the thirties for which key physics topics and their relation to the hadron-hadron HL-LHC physics programme are discussed. Demands are derived set by these physics topics on the design of the LHeC detector, a corresponding update of which is described. [...]
arXiv:2201.02436.-
2022-01-15 - 27 p.
- Published in : Eur. Phys. J. C 82 (2022) 40
Fulltext: 2201.02436 - PDF; document - PDF;
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7.
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Study of energy response and resolution of the ATLAS Tile Calorimeter to hadrons of energies from 16 to 30 GeV
/ Abdallah, Jalal (Texas U., Arlington) ; Angelidakis, Stylianos (Athens U.) ; Arabidze, Giorgi (Michigan State U., East Lansing (main)) ; Atanov, Nikolay (Dubna, JINR) ; Bernhard, Johannes (CERN) ; Bonnefoy, Romeo (Clermont-Ferrand U.) ; Bossio, Jonathan (McGill U.) ; Bouabid, Ryan (U. Chicago (main)) ; Carrio, Fernando (Valencia U.) ; Davidek, Tomas (Charles U.) et al.
Three spare modules of the ATLAS Tile Calorimeter were exposed to test beams from the Super Proton Synchrotron accelerator at CERN in 2017. The measurements of the energy response and resolution of the detector to positive pions and kaons and protons with energy in the range 16 to 30 GeV are reported. [...]
arXiv:2102.04088.-
2021-06-25 - 21 p.
- Published in : Eur. Phys. J. C 81 (2021) 549
Fulltext: document - PDF; 2102.04088 - PDF;
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8.
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Paramagnetism in Mn/Fe implanted ZnO
/ Gunnlaugsson, HP (Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark.) ; Fanciulli, M (CNR IMM MDM Lab, I-20041 Agrate Brianza, MB, Italy. ; Univ Milano Bicocca, Dept Mat Sci, I-20125 Milan, Italy.) ; Weyer, G (Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark.) ; Kobayashi, Y (RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan.) ; Bharuth-Ram, K (Univ KwaZulu Natal, Sch Phys, ZA-4001 Durban, South Africa. ; iThemba Labs, ZA-7129 Somerset W, South Africa.) ; Olafsson, S (Univ Iceland, Inst Sci, IS-107 Reykjavik, Iceland.) ; Gislason, H P (Univ Iceland, Inst Sci, IS-107 Reykjavik, Iceland.) ; Gunnlaugsson, H P (Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark.) ; Yoshida, Y (Shizuoka Inst Sci & Technol, Shizuoka 4378555, Japan.) ; Langouche, G (Univ Louvain, Inst Kern En Stralings Fys, B-3001 Louvain, Belgium.) et al.
Prompted by the generally poor understanding of the nature of magnetic phenomena in 3d-metal doped ZnO, we have undertaken on-line Fe-57 Mossbauer spectroscopy on ZnO single crystals in an external magnetic field of 0.6 T, following the implantation of radioactive Mn-57 ions at room temperature. The Mossbauer spectra of the dilute Fe impurities are dominated by sextets whose angular dependence rules out an ordered magnetic state (which had been previously proposed) but are well accounted for on the basis of Fe3+ paramagnetic centers on substitutional Zn sites with unusually long relaxation times (> 20 ns) [...]
2010
- Published in : Appl. Phys. Lett. 97 (2010) 142501
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9.
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Characterization of a potential 4-$\alpha$ cluster state
/ Neveling, R (iThemba LABS) ; Li, K C W (NITheP, Matieland) ; Adsley, P (iThemba LABS ; NITheP, Matieland) ; Papka, P (iThemba LABS ; NITheP, Matieland) ; Smit, F D (iThemba LABS) ; Brümmer, J W (NITheP, Matieland) ; Freer, M (Birmingham U.) ; Kokalova, Tz (Birmingham U.) ; Nemulodi, F (iThemba LABS ; NITheP, Matieland) ; Pellegri, L (iThemba LABS ; U. Witwatersrand, Johannesburg, Sch. Phys.) et al.
Geneva : CERN, 2015
Published version from CERN: PDF;
In : 14th International Conference on Nuclear Reaction Mechanisms, Villa Monastero, Varenna, Italy, 15 - 19 Jun 2015, pp.79
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