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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2017-04-11
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
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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2017-03-30
07:25
pySecDec: a toolbox for the numerical evaluation of multi-scale integrals / 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) ; Zirke, T. (Munich, Max Planck Inst.)
We present pySecDec, a new version of the program SecDec, which performs the factorisation of dimensionally regulated poles in parametric integrals, and the subsequent numerical evaluation of the finite coefficients. [...]
MPP-2017-42 ; CERN-TH-2017-063 ; IPPP-17-24 ; arXiv:1703.09692.
- 28 p.
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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. [...]
CERN-TH-2017-069 ; MPP-2017-41 ; NIKHEF-2017-020 ; arXiv:1703.09252.
- 24 p.
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2017-03-30
07:25
A Worm Algorithm for the Lattice CP(N-1) Model / Rindlisbacher, Tobias (Zurich, ETH) ; de Forcrand, Philippe (Zurich, ETH ; CERN)
The CP(N-1) model in 2D is an interesting toy model for 4D QCD as it possesses confinement, asymptotic freedom and a non-trivial vacuum structure. [...]
CERN-TH-2017-060 ; arXiv:1703.08571.
- 7 p.
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