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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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(52)

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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(35)

Simplified dark matter models with two Higgs doublets: I. Pseudoscalar mediators / Bauer, Martin (U. Heidelberg, ITP) ; Haisch, Ulrich (Oxford U., Theor. Phys. ; CERN) ; Kahlhoefer, Felix (DESY)
We study a new class of renormalisable simplified models for dark matter searches at the LHC that are based on two Higgs doublet models with an additional pseudoscalar mediator. In contrast to the spin-0 simplified models employed in analyses of Run I data these models are self-consistent, unitary and bounds from Higgs physics typically pose no constraints. [...]
arXiv:1701.07427; CERN-TH-2017-011; DESY-17-010.- 2017-05-25 - 38 p. - Published in : JHEP 05 (2017) 138 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;

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(28)

Searching for new spin-0 resonances at LHCb / Haisch, Ulrich (Oxford U., Theor. Phys. ; CERN) ; Kamenik, Jernej F (CERN ; Stefan Inst., Ljubljana ; Ljubljana U.)
We study the phenomenology of light spin-0 particles and stress that they can be efficiently searched for at the LHCb experiment in the form of dimuon resonances. Given the large production cross sections in the forward rapidity region together with the efficient triggering and excellent mass resolution, it is argued that LHCb can provide unique sensitivity to such states. [...]
arXiv:1601.05110; CERN-TH-2016-010.- Geneva : CERN, 2016 - 13 p. - Published in : Phys. Rev. D 93 (2016) 055047 APS Open Access article: PDF; Fulltext: PDF; External link: Preprint

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(27)

Constraining Light-Quark Yukawa Couplings from Higgs Distributions / Bishara, Fady (Oxford U., Theor. Phys.) ; Haisch, Ulrich (CERN ; Oxford U., Theor. Phys.) ; Monni, Pier Francesco (Oxford U., Theor. Phys.) ; Re, Emanuele (Annecy, LAPTH)
We propose a novel strategy to constrain the bottom and charm Yukawa couplings by exploiting LHC measurements of transverse momentum distributions in Higgs production. Our method does not rely on the reconstruction of exclusive final states or heavy-flavour tagging. [...]
arXiv:1606.09253; OUTP-16-18P; CERN-TH-2016-136; LAPTH-026/16.- 2017-03-20 - 6 p. - Published in : Phys. Rev. Lett. 118 (2017) 121801 APS Open Access article: PDF; Fulltext: PDF; Preprint: PDF; External link: Preprint

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(26)

Determining the CP nature of spin-0 mediators in associated production of dark matter and $ t\overline{t} $ pairs / Haisch, Ulrich (Oxford U., Theor. Phys. ; CERN) ; Pani, Priscilla (Stockholm U. ; CERN) ; Polesello, Giacomo (INFN, Pavia ; CERN)
In the framework of spin-0 $s$-channel simplified models, we explore the possibility of assessing the structure of dark matter interactions through the associate production of dark matter and $t\bar{t}$ pairs. To this purpose, final states with two leptons are considered and the kinematic properties of the dilepton system is studied. [...]
arXiv:1611.09841; CERN-TH-2016-243; CERN-TH-2016-243.- 2017-02-27 - 24 p. - Published in : JHEP 02 (2017) 131 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF;

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(26)

On Light Resonance Interpretations of the B Decay Anomalies / Bishara, Fady (Oxford U., Theor. Phys.) ; Haisch, Ulrich (CERN ; Oxford U., Theor. Phys.) ; Monni, Pier Francesco (CERN)
We sketch a novel method to search for light di-leptonic resonances by exploiting precision measurements of Drell-Yan production. Motivated by the recent hints of lepton flavour universality violation in $B \to K^{\ast} \ell^+ \ell^-$, we illustrate our proposal by studying the case of spin-1 resonances that couple to muons and have masses in the range of a few GeV. [...]
arXiv:1705.03465; CERN-TH-2017-104.- 2017-09-05 - 5 p. - Published in : Phys. Rev. D 96 (2017) 055002 Fulltext: PDF; Preprint: PDF;

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(21)

Searching for heavy Higgs bosons in the $t \bar t Z$ and $t b W$ final states / Haisch, Ulrich (Oxford U., Theor. Phys. ; CERN) ; Polesello, Giacomo (INFN, Pavia)
In the context of two-Higgs doublet models, we explore the possibility of searching for heavy Higgs bosons in the $t \bar t Z$ and $t bW$ final states. We develop realistic analyses strategies and in the case of the $t \bar t Z$ channel provide a detailed evaluation of the new-physics reach at the 14 TeV LHC. [...]
arXiv:1807.07734; CERN-TH-2018-155.- 2018-09-26 - 25 p. - Published in : JHEP 09 (2018) 151 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: arXiv:1807.07734 - PDF; 1807.07734 - PDF;

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(19)

Interpreting top-quark LHC measurements in the standard-model effective field theory / Aguilar-Saavedra, Juan Antonio (ed.) (Granada U., Theor. Phys. Astrophys.) ; Degrande, C. (ed.) (CERN) ; Durieux, G. (ed.) (DESY) ; Maltoni, F. (ed.) (Louvain U., CP3) ; Vryonidou, E. (ed.) (CERN) ; Zhang, C. (ed.) (Beijing, Inst. High Energy Phys.) ; Barducci, D. (INFN, Trieste ; SISSA, Trieste) ; Brivio, I. (Bohr Inst.) ; Cirigliano, V. (Los Alamos) ; Dekens, W. (Los Alamos ; Cray Research, Los Alamos) et al.
This note proposes common standards and prescriptions for the effective-field-theory interpretation of top-quark measurements at the LHC..
arXiv:1802.07237 ; CERN-LPCC-2018-01. - 2018. - 50 p.
Fulltext

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(17)

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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