CERN Accelerating science

TH Preprints

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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. [...]
CERN-TH-2017-086 ; CP3-ORIGINS-2017-014 ; IFUP-TH-2017 ; arXiv:1704.05438.
- 30 p.
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2017-04-15
08:30
Multi-loop calculations: numerical methods and applications / Borowka, S. (CERN) ; Heinrich, G. (Munich, Max Planck Inst.) ; Jahn, S. (Munich, Max Planck Inst.) ; Jones, S.P. (Munich, Max Planck Inst.) ; Kerner, M. (Munich, Max Planck Inst.) ; Schlenk, J. (Durham U., IPPP)
We briefly review numerical methods for calculations beyond one loop and then describe new developments within the method of sector decomposition in more detail. [...]
CERN-TH-2017-051 ; IPPP-17-28 ; MPP-2017-62 ; arXiv:1704.03832.
- 10 p.
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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 $Z'$. [...]
KCL-PH-TH-2017-21 ; CERN-TH-2017-084 ; arXiv:1704.03850.
- 19 p.
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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. [...]
MIT-CTP-4897 ; CERN-TH-2017-073 ; arXiv:1704.03393.
- 38 p.
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2017-04-11
08:06
Where is Particle Physics Going? / Ellis, John (King's Coll. London ; CERN)
The answer to the question in the title is: in search of new physics beyond the Standard Model, for which there are many motivations, including the likely instability of the electroweak vacuum, dark matter, the origin of matter, the masses of neutrinos, the naturalness of the hierarchy of mass scales, cosmological inflation and the search for quantum gravity [...]
KCL-PH-TH-2017-18 ; CERN-TH-2017-080 ; arXiv:1704.02821.
- 20 p.
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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. [...]
arXiv:1703.04406 ; CERN-TH-2017-059.
- 42 p.
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2017-04-05
07:33
Radiative symmetry breaking from interacting UV fixed points / Abel, Steven (Durham U., IPPP ; CERN) ; Sannino, Francesco (CERN ; U. Southern Denmark, CP3-Origins ; U. Southern Denmark, Odense, DIAS)
It is shown that the addition of positive mass-squared terms to asymptotically safe gauge-Yukawa theories with perturbative UV fixed points leads to calculable radiative symmetry breaking in the IR. [...]
CERN-TH-2017-066 ; CP3-ORIGINS-2017-011-DNRF90 ; IPPP-2017-23 ; arXiv:1704.00700.
- 25 p.
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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. [...]
CERN-TH-2017-072 ; arXiv:1703.10418.
- 12 p.
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2017-03-31
07:54
Continuum limit and universality of the Columbia plot / de Forcrand, Philippe (ETH, Zurich (main) ; CERN) ; D'Elia, Massimo (INFN, Pisa ; Pisa U.)
Results on the thermal transition of QCD with 3 degenerate flavors, in the lower-left corner of the Columbia plot, are puzzling. [...]
arXiv:1702.00330 ; CERN-TH-2017-022.
- 7 p.
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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. [...]
CERN-TH-2017-023 ; arXiv:1701.07804.
- 16 p.
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