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Constraints on the trilinear Higgs coupling from vector boson fusion and associated Higgs production at the LHC
/ Bizon, Wojciech (Oxford U., Theor. Phys.) ; Gorbahn, Martin (Liverpool U., Dept. Math.) ; Haisch, Ulrich (CERN ; Oxford U., Theor. Phys.) ; Zanderighi, Giulia (CERN ; Oxford U., Theor. Phys.)
We examine the constraints on the trilinear Higgs coupling $\lambda$ that originate from associated ($Vh$) and vector boson fusion (VBF) Higgs production in $pp$ collisions in the context of the Standard Model effective field theory. The 1-loop contributions to $pp \to V h$ and $pp \to jj h$ that stem from insertions of the dimension-6 operator $O_6 = - \lambda \left (H^\dagger H \right )^3$ are calculated and combined with the ${\cal O} (\lambda)$ corrections to the partial decay widths of the Higgs boson. [...]
arXiv:1610.05771; CERN-TH-2016-215; LTH-1104; OUTP-16-23P.-
2017-07-17 - 24 p.
- Published in : JHEP 07 (2017) 083
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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2.
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Indirect probes of the trilinear Higgs coupling: $gg \to h$ and $h \to \gamma \gamma$
/ Gorbahn, Martin (Liverpool U., Dept. Math.) ; Haisch, Ulrich (Oxford U., Theor. Phys. ; CERN)
In the framework of the Standard Model effective field theory, we examine the indirect constraints on the trilinear Higgs coupling $\lambda$ that arise from Higgs production in gluon-gluon-fusion and diphoton Higgs decays. We calculate 2-loop contributions to the $gg \to h$ and $h \to \gamma \gamma$ amplitudes that are affected by modifications of the trilinear Higgs-boson vertex. [...]
arXiv:1607.03773; LTH-1092; CERN-TH-2016-161; LTH 1092; CERN-TH-2016-161.-
2016-10-18 - 18 p.
- Published in : JHEP 10 (2016) 094
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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Constraints on the quartic Higgs self-coupling from double-Higgs production at future hadron colliders
/ Bizoń, Wojciech (KIT, Karlsruhe, TTP ; KIT, Karlsruhe, IKP ; Oxford U., Theor. Phys.) ; Haisch, Ulrich (Munich, Max Planck Inst. ; Oxford U., Theor. Phys. ; CERN) ; Rottoli, Luca (Milan Bicocca U. ; Oxford U., Theor. Phys.)
We study the indirect constraints on the quartic Higgs self-coupling that arise from double-Higgs production at future hadron colliders. To this purpose, we calculate the two-loop contributions to the $gg \to hh$ amplitudes that involve a modified $h^4$ vertex. [...]
arXiv:1810.04665; CERN-TH-2018-218; OUTP-17-21P.-
2019-10-30 - 23 p.
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: document - PDF; 1810.04665 - PDF;
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4.
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Momentum-space resummation for transverse observables and the Higgs $p_\perp$ at N$^3$LL+NNLO
/ Bizon, Wojciech (Oxford U., Theor. Phys.) ; Monni, Pier Francesco (CERN) ; Re, Emanuele (CERN ; Annecy, LAPTH) ; Rottoli, Luca (Oxford U., Theor. Phys.) ; Torrielli, Paolo (Turin U. ; INFN, Turin)
We present an approach to the momentum-space resummation of global, recursive infrared and collinear safe observables featuring kinematic zeros away from the Sudakov limit. In the hadro-production of a generic colour singlet, we consider the family of inclusive observables which do not depend on the rapidity of the radiation, prime examples being the transverse momentum of the singlet, and $\phi^*$ in Drell-Yan pair production. [...]
arXiv:1705.09127; OUTP-17-05P; CERN-TH-2017-111; LAPTH-018-17.-
2018-02-19 - 50 p.
- Published in : JHEP 02 (2018) 108
Article from SCOAP3: PDF; Fulltext: arXiv:1705.09127 - PDF; 1705.09127 - PDF;
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5.
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Let there be light from a second light Higgs doublet
/ Haisch, Ulrich (CERN ; Oxford U., Theor. Phys.) ; Malinauskas, Augustinas (Oxford U., Theor. Phys.)
In this article, we demonstrate that the unexpected peak at around $95 \, {\rm GeV}$ as seen recently by CMS in the di-photon final state can be explained within the type-I~two-Higgs-doublet model by means of a moderately-to-strongly fermiophobic CP-even Higgs $H$. Depending on the Higgs mass spectrum, the production of such~a~$H$ arises dominantly from vector boson fusion or through a cascade in either $pp \to t \bar t$ with $\overset{(-)}{t} \to H^{\pm} \overset{(-)}{b} \to W^{\pm \, \ast} H \overset{(-)}{b}$ or $pp \to A$ with $A \to W^{\mp} H^{\pm} \to W^{\mp} W^{\pm} H$ or via $pp \to W^{\pm \, \ast} \to H^\pm H$. [...]
arXiv:1712.06599; CERN-TH-2017-276.-
2018-03-22 - 21 p.
- Published in : JHEP 03 (2018) 135
Article from SCOAP3: PDF; Fulltext: PDF;
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6.
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Parton distributions with threshold resummation
/ Bonvini, Marco (Oxford U., Theor. Phys.) ; Marzani, Simone (MIT, Cambridge, CTP) ; Rojo, Juan (Oxford U., Theor. Phys.) ; Rottoli, Luca (Oxford U., Theor. Phys.) ; Ubiali, Maria (Cambridge U.) ; Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys. ; CERN) ; Bertone, Valerio (CERN) ; Carrazza, Stefano (Milan U. ; INFN, Milan) ; Hartland, Nathan P. (Oxford U., Theor. Phys.)
We construct a set of parton distribution functions (PDFs) in which fixed-order NLO and NNLO calculations are supplemented with soft-gluon (threshold) resummation up to NLL and NNLL accuracy respectively, suitable for use in conjunction with any QCD calculation in which threshold resummation is included at the level of partonic cross sections. These resummed PDF sets, based on the NNPDF3.0 analysis, are extracted from deep-inelastic scattering, Drell-Yan, and top quark pair production data, for which resummed calculations can be consistently used. [...]
arXiv:1507.01006; OUTP-15-03P; MIT-CTP-4657; CAVENDISH-HEP-15-02; CERN-PH-TH-2015-060; EDINBURGH-2015-04; TIF-UNIMI-2015-6; OUTP-15-03P; MIT-CTP 4657; CAVENDISH-HEP-15-02; CERN-PH-TH-2015-060; EDINBURGH 2015-04; TIF-UNIMI-2015-6.-
Geneva : CERN, 2015-09-28 - 44 p.
- Published in : JHEP 09 (2015) 191
Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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Collider constraints on light pseudoscalars
/ Haisch, Ulrich (Oxford U., Theor. Phys. ; CERN) ; Kamenik, Jernej F. (Stefan Inst., Ljubljana ; Ljubljana U.) ; Malinauskas, Augustinas (Oxford U., Theor. Phys.) ; Spira, Michael (PSI, Villigen)
We investigate the bounds on light pseudoscalars that arise from a variety of collider searches. Special attention is thereby devoted to the mass regions $[3, 5] \, {\rm GeV}$ and $[9,11] \, {\rm GeV}$, in which a meaningful theoretical description has to include estimates of non-perturbative effects such as the mixing of the pseudoscalar with QCD bound states. [...]
arXiv:1802.02156; CERN-TH-2018-025; PSI-PR-18-03.-
2018-03-28 - 17 p.
- Published in : JHEP 03 (2018) 178
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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