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2017-04-19
08:09
Flavour anomalies after the $R_{K^*}$ measurement / D'Amico, Guido (CERN) ; Nardecchia, Marco (CERN) ; Panci, Paolo (CERN) ; Sannino, Francesco (CERN ; U. Southern Denmark, CP3-Origins ; U. Southern Denmark, Odense, DIAS) ; Strumia, Alessandro (CERN ; Pisa U. ; INFN, Pisa) ; Torre, Riccardo (EPFL, Lausanne, LPTP) ; Urbano, Alfredo (CERN)
The LHCb measurement of the $\mu/e$ ratio $R_{K^*}$ indicates a deficit with respect to the Standard Model prediction, supporting earlier hints of lepton universality violation observed in the $R_K$ ratio. We show that the $R_K$ and $R_{K^*}$ ratios alone constrain the chiralities of the states contributing to these anomalies, and we find deviations from the Standard Model at the $4\sigma$ level. [...]
CERN-TH-2017-086; CP3-ORIGINS-2017-014; IFUP-TH-2017; arXiv:1704.05438.- 2017-09-04 - 31 p. - Published in : JHEP 09 (2017) 010 Article from SCOAP3: PDF; Preprint: PDF;

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2017-04-15
08:30
Anomaly-Free Dark Matter Models are not so Simple / Ellis, John (King's Coll. London ; CERN) ; Fairbairn, Malcolm (King's Coll. London) ; Tunney, Patrick (King's Coll. London)
We explore the anomaly-cancellation constraints on simplified dark matter (DM) models with an extra U(1)$^\prime$ gauge boson $Z'$. We show that, if the Standard Model (SM) fermions are supplemented by a single DM fermion $\chi$ that is a singlet of the SM gauge group, and the SM quarks have non-zero U(1)$^\prime$ charges, the SM leptons must also have non-zero U(1)$^\prime$ charges, in which case LHC searches impose strong constraints on the $Z'$ mass. [...]
KCL-PH-TH-2017-21; CERN-TH-2017-084; arXiv:1704.03850.- 2017-08-16 - 19 p. - Published in : JHEP 08 (2017) 053 Article from SCOAP3: PDF; Preprint: PDF;

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2017-04-13
08:29
Single top polarisation as a window to new physics / Aguilar-Saavedra, J.A. (Granada U., Theor. Phys. Astrophys.) ; Degrande, C. (CERN) ; Khatibi, S. (IPM, Tehran)
We discuss the effect of heavy new physics, parameterised in terms of four-fermion operators, in the polarisation of single top (anti-)quarks in the $t$-channel process at the LHC. It is found that for operators involving a right-handed top quark field the relative effect on the longitudinal polarisation is twice larger than the relative effect on the total cross section. [...]
CERN-TH-2017-013; arXiv:1701.05900.- 2017-06-10 - 9 p. - Published in : Phys. Lett. B 769 (2017) 498-502 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF;

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2017-04-12
07:18
Colorful Twisted Top Partners and Partnerium at the LHC / Kats, Yevgeny (CERN ; Ben Gurion U. of Negev ; Weizmann Inst.) ; McCullough, Matthew (CERN) ; Perez, Gilad (Weizmann Inst.) ; Soreq, Yotam (MIT, Cambridge, CTP) ; Thaler, Jesse (MIT, Cambridge, CTP)
In scenarios that stabilize the electroweak scale, the top quark is typically accompanied by partner particles. In this work, we demonstrate how extended stabilizing symmetries can yield scalar or fermionic top partners that transform as ordinary color triplets but carry exotic electric charges. [...]
MIT-CTP-4897; CERN-TH-2017-073; arXiv:1704.03393.- 2017-06-23 - 34 p. - Published in : JHEP 06 (2017) 126 Article from SCOAP3: PDF; Preprint: PDF;

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2017-04-08
07:18
An Investigation of New Methods for Numerical Stochastic Perturbation Theory in $\varphi^4$ Theory / Dalla Brida, Mattia (Milan Bicocca U. ; INFN, Milan Bicocca) ; Garofalo, Marco (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Kennedy, A.D. (U. Edinburgh, Higgs Ctr. Theor. Phys.)
Numerical stochastic perturbation theory is a powerful tool for estimating high-order perturbative expansions in lattice field theory. The standard algorithms based on the Langevin equation, however, suffer from several limitations which in practice restrict the potential of this technique. [...]
CERN-TH-2017-059; arXiv:1703.04406.- 2017-09-06 - 22 p. - Published in : Phys. Rev. D 96 (2017) 054502 Preprint: PDF;

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2017-03-31
07:54
Wilson lines and UV sensitivity in magnetic compactifications / Ghilencea, D.M. (Bucharest, IFIN-HH) ; Lee, Hyun Min (Chung-Ang U.)
We investigate the ultraviolet (UV) behaviour of 6D N=1 supersymmetric effective (Abelian) gauge theories compactified on a two-torus ($T_2$) with magnetic flux. To this purpose we compute offshell the one-loop correction to the Wilson line state self-energy. [...]
CERN-TH-2017-072; arXiv:1703.10418.- 2017-06-07 - 13 p. - Published in : JHEP 06 (2017) 039 Article from SCOAP3: PDF; Preprint: PDF;

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2017-03-31
07:54
Higher order perturbations of Anti-de Sitter space and time-periodic solutions of vacuum Einstein equations / Rostworowski, Andrzej (Jagiellonian U.)
Motivated by the problem of stability of Anti-de Sitter (AdS) spacetime, we discuss nonlinear gravitational perturbations of maximally symmetric solutions of vacuum Einstein equations in general and the case of AdS in particular. We present the evidence that, similarly to the self-gravitating scalar field at spherical symmetry, the negative cosmological constant allows for the existence of globally regular, asymptotically AdS, time-periodic solutions of vacuum Einstein equations whose frequencies bifurcate from linear eigenfrequencies of AdS. [...]
CERN-TH-2017-023; arXiv:1701.07804.- 2017-06-26 - 16 p. - Published in : Phys. Rev. D 95 (2017) 124043 Fulltext: 10.1103_PhysRevD.95.124043 - PDF; arXiv:1701.07804 - PDF;

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2017-03-30
07:25
NLO predictions for Higgs boson pair production with full top quark mass dependence matched to parton showers / Heinrich, G. (Munich, Max Planck Inst.) ; Jones, S.P. (Munich, Max Planck Inst.) ; Kerner, M. (Munich, Max Planck Inst.) ; Luisoni, G. (CERN) ; Vryonidou, E. (NIKHEF, Amsterdam)
We present the first combination of NLO QCD matrix elements for di-Higgs production, retaining the full top quark mass dependence, with a parton shower. Results are provided within both the POWHEG-BOX and MadGraph5_aMC@NLO Monte Carlo frameworks. [...]
CERN-TH-2017-069; MPP-2017-41; NIKHEF-2017-020; arXiv:1703.09252.- 2017-08-21 - 24 p. - Published in : JHEP 08 (2017) 088 Article from SCOAP3: PDF; Preprint: PDF;

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2017-03-30
07:24
$W^\pm Z$ production at the LHC: fiducial cross sections and distributions in NNLO QCD / Grazzini, Massimiliano (Zurich U.) ; Kallweit, Stefan (CERN) ; Rathlev, Dirk (Zurich U.) ; Wiesemann, Marius (Zurich U. ; CERN)
We report on the first fully differential calculation for $W^\pm Z$ production in hadron collisions up to next-to-next-to-leading order (NNLO) in QCD perturbation theory. Leptonic decays of the $W$ and $Z$ bosons are consistently taken into account, i.e. [...]
ZU-TH-06-17; CERN-TH-2017-065; arXiv:1703.09065.- 2017-05-26 - 37 p. - Published in : JHEP 05 (2017) 139 Article from SCOAP3: PDF; Preprint: PDF;

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2017-03-30
07:24
Standard Model Parton Distributions at Very High Energies / Bauer, Christian W. (LBNL, Berkeley ; CERN) ; Ferland, Nicolas (LBNL, Berkeley) ; Webber, Bryan R. (Cambridge U.)
We compute the leading-order evolution of parton distribution functions for all the Standard Model fermions and bosons up to energy scales far above the electroweak scale, where electroweak symmetry is restored. Our results include the 52 PDFs of the unpolarized proton, evolving according to the SU(3), SU(2), U(1), mixed SU(2) x U(1) and Yukawa interactions. [...]
CAVENDISH-HEP-17-03; CERN-TH-2017-067; arXiv:1703.08562.- 2017-08-09 - 31 p. - Published in : JHEP 08 (2017) 036 Article from SCOAP3: PDF; Preprint: PDF;

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