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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 - 38 p. - Published in : JHEP 1706 (2017) 126 Fulltext: PDF;

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2017-04-07
07:44
Long-range critical exponents near the short-range crossover / Behan, Connor (YITP, Stony Brook) ; Rastelli, Leonardo (YITP, Stony Brook) ; Rychkov, Slava (CERN ; Ecole Normale Superieure ; UPMC, Paris (main)) ; Zan, Bernardo (ITPP, Lausanne ; CERN)
The $d$-dimensional long-range Ising model, defined by spin-spin interactions decaying with the distance as the power $1/r^{d+s}$, admits a second order phase transition with continuously varying critical exponents. At $s = s_*$, the phase transition crosses over to the usual short-range universality class. [...]
YITP-SB-17-12; CERN-TH-2017-058; arXiv:1703.03430.- 2017-06-15 - 5 p. - Published in : Phys. Rev. Lett. 118 (2017) 241601 Fulltext: arXiv:1703.03430 - PDF; 10.1103_PhysRevLett.118.241601 - 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 - 12 p. - Published in : JHEP 06 (2017) 039 Fulltext: PDF; Springer Open Access Article: 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
07:24
$W^\pm Z$ 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.- 2017-03-27 - 38 p. - Published in : JHEP 05 (2017) 139 Fulltext: PDF;

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2017-03-30
07:23
Inflationary Perturbations in No-Scale Theories / Salvio, Alberto (CERN)
We study the inflationary perturbations in general (classically) scale-invariant theories. Such scenario is motivated by the hierarchy problem and provides natural inflationary potentials and dark matter candidates. [...]
CERN-TH-2017-068; arXiv:1703.08012.- 2017-04-27 - 38 p. - Published in : Eur. Phys. J. C 77 (2017) 267 Fulltext: PDF; Springer Open Access article: PDF;

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2017-03-30
07:22
Heat kernel methods for Lifshitz theories / Barvinsky, Andrei O. (Lebedev Inst. ; Tomsk State U.) ; Blas, Diego (CERN) ; Herrero-Valea, Mario (EPFL, Lausanne, LPPC) ; Nesterov, Dmitry V. (Lebedev Inst.) ; Pérez-Nadal, Guillem (Buenos Aires U.) ; Steinwachs, Christian F. (Freiburg U.)
We study the one-loop covariant effective action of Lifshitz theories using the heat kernel technique. The characteristic feature of Lifshitz theories is an anisotropic scaling between space and time. [...]
CERN-TH-2017-055; FR-PHENO-2017-006; arXiv:1703.04747.- 2017-06-13 - 36 p. - Published in : JHEP 1706 (2017) 063 Fulltext: PDF; Springer Open Access Article: PDF;

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2017-03-30
07:22
Right-handed charged currents in the era of the Large Hadron Collider / Alioli, S. (CERN) ; Cirigliano, V. (Los Alamos Natl. Lab., Theor. Div.) ; Dekens, W. (Los Alamos Natl. Lab., Theor. Div. ; New Mexico Consortium, Los Alamos) ; de Vries, J. (NIKHEF, Amsterdam) ; Mereghetti, E. (Los Alamos Natl. Lab., Theor. Div.)
We discuss the phenomenology of right-handed charged currents in the framework of the Standard Model Effective Field Theory, in which they arise due to a single gauge-invariant dimension-six operator. We study the manifestations of the nine complex couplings of the $W$ to right-handed quarks in collider physics, flavor physics, and low-energy precision measurements. [...]
CERN-TH-2017-043; LA-UR-17-21898; NIKHEF-2017-014; arXiv:1703.04751.- 2017-03-14 - 50 p. - Published in : JHEP 05 (2017) 086 Fulltext: PDF;

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2017-03-14
16:44
SMD-based numerical stochastic perturbation theory / Dalla Brida, Mattia (Milan Bicocca U. ; INFN, Milan Bicocca) ; Lüscher, Martin (CERN ; Bern U.)
The viability of a variant of numerical stochastic perturbation theory, where the Langevin equation is replaced by the SMD algorithm, is examined. In particular, the convergence of the process to a unique stationary state is rigorously established and the use of higher-order symplectic integration schemes is shown to be highly profitable in this context. [...]
CERN-TH-2017-057; arXiv:1703.04396.- 2017-05-13 - 35 p. - Published in : Eur. Phys. J. C 77 (2017) 308 Fulltext: PDF; Springer Open Access article: PDF;

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