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Interference Effects in $\mathbf{gg \to H \to Z \gamma}$ Beyond Leading Order
/ Buccioni, Federico (Munich, Tech. U.) ; Devoto, Federica (U. Oxford (main)) ; Djouadi, Abdelhak (Granada U.) ; Ellis, John (King's Coll. London ; CERN) ; Quevillon, Jérémie (Annecy, LAPTH) ; Tancredi, Lorenzo (Munich, Tech. U.)
The ATLAS and CMS collaborations at the LHC have recently announced evidence for the rare Higgs boson decay into a $Z$ boson and a photon. We analyze the interference between the process $gg\! \to \! H \! \to \! Z \gamma$ induced by loops of heavy particles, which is by far the dominant contribution to the signal, and the continuum $gg \to Z \gamma$ QCD background process mediated by light quark loops. [...]
arXiv:2312.12384; KCL-PH-TH/2023-70; CERN-TH-2023-228; TUM-HEP-1488/23; OUTP-23-18P.-
2024-03-24 - 6 p.
- Published in : Phys. Lett. B 851 (2024) 138596
Fulltext: PDF;
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3.
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Higgs couplings: constraints and sensitivity on Supersymmetry
/ Mahmoudi, Farvah (IP2I, Lyon ; CERN) ; Arbey, Alexandre (IP2I, Lyon ; CERN) ; Battaglia, Marco (UC, Santa Cruz) ; Djouadi, Abdelhak (Annecy, LAPTH ; NICPB, Tallinn) ; Mühlleitner, Margarete (KIT, Karlsruhe) ; Spira, Michael (PSI, Villigen)
The determination of the fundamental properties of the Higgs boson with sufficient accuracy has crucial implications for physics beyond the Standard Model. Here, we consider Supersymmetry and highlight the complementarity of the Higgs measurements and the superparticle searches at the LHC, based on the 8 and 13 TeV results, in probing its phenomenological minimal version, the pMSSM. [...]
SISSA, 2021 - 6 p.
- Published in : PoS ICHEP2020 (2021) 261
Fulltext: PDF;
In : 40th International Conference on High Energy Physics (ICHEP), Prague, Czech Republic, 28 Jul - 6 Aug 2020, pp.261
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Interference Effects in $t{\bar t}$ Production at the LHC as a Window on New Physics
/ Djouadi, Abdelhak (Annecy, LAPTH ; NICPB, Tallinn) ; Ellis, John (NICPB, Tallinn ; King's Coll. London ; CERN) ; Popov, Andrey (Lyon, IPN ; SINP, Moscow) ; Quevillon, Jérémie (LPSC, Grenoble)
Many extensions of the Standard Model contain (pseudo)scalar bosons with masses in the TeV range. At hadron colliders, such particles would predominantly be produced in gluon fusion and would decay into top quark pair final sates, a signal that interferes with the large QCD background $gg \to t\bar t$. [...]
arXiv:1901.03417; CERN-TH-2019-001; KCL-PH-TH/2018-05; LAPTH/001/19.-
2019-03-21 - 44 p.
- Published in : JHEP 03 (2019) 119
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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Addendum to: Predictions for Higgs production at the Tevatron and the associated uncertainties
/ Baglio, Julien (Orsay, LPT) ; Djouadi, Abdelhak (Orsay, LPT ; CERN)
We update the theoretical predictions for the production cross sections of the Standard Model Higgs boson at the Fermilab Tevatron collider, focusing on the two main search channels, the gluon-gluon fusion mechanism $gg \to H$ and the Higgs-strahlung processes $q \bar q \to VH$ with $V=W/Z$, including all relevant higher order QCD and electroweak corrections in perturbation theory. We then estimate the various uncertainties affecting these predictions: the scale uncertainties which are viewed as a measure of the unknown higher order effects, the uncertainties from the parton distribution functions and the related errors on the strong coupling constant, as well as the uncertainties due to the use of an effective theory approach in the determination of the radiative corrections in the $gg \to H$ process at next-to-next-to-leading order. [...]
arXiv:1009.1363.-
2010 - 10 p.
Fulltext: PDF; Preprint: arXiv_1009.1363 - PDF; arXiv:1009.1363 - PDF;
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HDECAY: Twenty$_{++}$ Years After
/ Djouadi, Abdelhak (Orsay, LPT) ; Kalinowski, Jan (Warsaw U. ; CERN) ; Muehlleitner, Margarete (KIT, Karlsruhe, TP) ; Spira, Michael (PSI, Villigen)
/HDECAY Collaboration
The program HDECAY determines the partial decay widths and branching ratios of the Higgs bosons within the Standard Model with three and four generations of fermions, including the case when the Higgs couplings are rescaled, a general two--Higgs doublet model where the Higgs sector is extended and incorporates five physical states and its most studied incarnation, the minimal supersymmetric Standard Model (MSSM). The program addresses all decay channels including the dominant higher-order effects such as radiative corrections and multi-body channels. [...]
arXiv:1801.09506; LPT-ORSAY-18-04; CERN-TH-2017-262; LPT-Orsay-18-04; KA-TP-03-2018; PSI-PR-18-02.-
2019-05 - 18 p.
- Published in : Comput. Phys. Commun. 238 (2019) 214-231
Fulltext: arXiv:1801.09506 - PDF; 1801.09506 - PDF;
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The Higgs At The Tevatron: Predictions And Uncertainties
/ Baglio, Julien (CERN) ; Djouadi, Abdelhak (CERN ; Orsay, LAL)
We update the theoretical predictions for the production cross sections of the Standard Model Higgs boson at the Tevatron in the gluon–gluon fusion and the Higgs–strahlung channels, including all relevant higher order QCD and electroweak corrections in perturbation theory. We estimate the different sources of uncertainties: the scale uncertainties, the uncertainties from the parton distribution functions and the related errors on the strong coupling constant as well as the uncertainties coming from the use of an effective theory approach in the gg → H process. [...]
Paris, France : Moriond, 2010 - 6 p.
- Published in : , pp. 25-30
Fulltext: PDF;
In : 45th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 06 - 13 Mar 2010, pp.25-30
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Theoretical Uncertainties In Higgs Searches
/ Djouadi, Abdelhak (Orsay, LPT ; CERN)
In this talk, we respond to the comments and criticisms made by the representatives of the CDF and D0 collaborations on our recent papers in which we point out that the theoretical uncertainties in the Higgs production cross section have been largely underestimated and, if properly taken into account, will significantly loosen the Tevatron Higgs exclusion bounds. We show that our approach to the theoretical uncertainties is fully justified and, furthermore, provide additional details on our statistical analysis of the CDF and D0 exclusion limit which show that it is conceptually correct..
2011 - 4 p.
- Published in : , pp. 35-40
Fulltext: PDF;
In : 46th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Italy, 20 - 27 Mar 2011, pp.35-40
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Enhanced Rates for Diphoton Resonances in the MSSM
/ Djouadi, Abdelhak (Orsay, LPT ; CERN) ; Pilaftsis, Apostolos (CERN ; Manchester U.)
We propose a simple mechanism for copiously producing heavy Higgs bosons with enhanced decay rates to two photons at the LHC, within the context of the Minimal Supersymmetric extension of the Standard Model (MSSM). In the CP-conserving limit of the theory, such a diphoton resonance may be identified with the heavier CP-even $H$ boson, whose gluon-fusion production and decay into two photons are enhanced by loops of the lightest supersymmetric partner of the top quark $\tilde{t}_1$ when its mass $m_{\tilde{t}_1}$ happens to be near the $\tilde{t}^*_1\tilde{t}_1$ threshold, i.e.~for $m_{\tilde{t}_1}\!\simeq \!\frac12 M_H$. [...]
CERN-TH-2016-109; LPT-ORSAY-16-41; MAN-HEP-2016-07; arXiv:1605.01040.-
Geneva Geneva : CERN, CERN, 2017-02-10 - 6 p.
- Published in : Phys. Lett. B 765 (2017) 175-180
Article from SCOAP3: PDF; Preprint: PDF; External link: Preprint
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Interference effects in the decays of spin-zero resonances into $\gamma \gamma$ and $ t\overline{t} $
/ Djouadi, Abdelhak (Orsay, LPT ; CERN) ; Ellis, John (CERN ; King's Coll. London) ; Quevillon, Jérémie (King's Coll. London)
We consider interference effects in the production via gluon fusion in LHC collisions at 13 TeV and decays into $\gamma \gamma$ and $t {\bar t}$ final states of the putative 750 GeV state(s) $\Phi$, assumed here to be scalar and/or pseudo scalar particle(s). We revisit previous calculations of the interferences between the heavy-fermion loop-induced $gg \to \Phi \to \gamma \gamma$ signal and the continuum $gg\to \gamma\gamma$ QCD background, which can alter the production rate as well as modify the line-shape and apparent mass. [...]
arXiv:1605.00542; CERN-TH-2016-095; KCL-PH-TH-2016-20; LPT-ORSAY-16-39; LPT-ORSAY--16--39.-
Geneva : CERN, 2016-07-20 - 35 p.
- Published in : JHEP 07 (2016) 105
Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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