CERN Accelerating science

TH Articles

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2016-04-27
07:38
Charm in Deep-Inelastic Scattering / Ball, Richard D (U. Edinburgh, Higgs Ctr. Theor. Phys. ; CERN) ; Bonvini, Marco (Oxford U., Theor. Phys.) ; Rottoli, Luca (Oxford U., Theor. Phys.)
We show how to extend systematically the FONLL scheme for inclusion of heavy quark mass effects in DIS to account for the possible effects of an intrinsic charm component in the nucleon. We show that when there is no intrinsic charm, FONLL is equivalent to S-ACOT to any order in perturbation theory, while when an intrinsic charm component is included FONLL is identical to ACOT, again to all orders in perturbation theory. [...]
arXiv:1510.02491; EDINBURGH-2015-06; CERN-PH-TH-2015-118; OUTP-15-25P.- Geneva : CERN, 2015 - 43 p. - Published in : J. High Energy Phys. 11 (2015) 122 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2016-02-04
08:22
Sigma Models with Negative Curvature / Alonso, Rodrigo (UC, San Diego) ; Jenkins, Elizabeth E (UC, San Diego ; CERN) ; Manohar, Aneesh V (UC, San Diego ; CERN)
We construct Higgs Effective Field Theory (HEFT) based on the scalar manifold H^n, which is a hyperbolic space of constant negative curvature. The Lagrangian has a non-compact O(n,1) global symmetry group, but it gives a unitary theory as long as only a compact subgroup of the global symmetry is gauged. [...]
arXiv:1602.00706; CERN-TH-2016-024.- 2016 - 8 p. - Published in : Phys. Lett. B 756 (2016) 358-364 Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint

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2016-01-21
09:02
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.- 2016 - 13 p. - Published in : Phys. Rev. D 93 (2016) 055047 Fulltext: PDF; External link: Preprint

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2016-01-16
08:21
Statistical anisotropy from inflationary magnetogenesis / Giovannini, Massimo (CERN ; INFN, Milan Bicocca)
Provided the quantum fluctuations are amplified in the presence of a classical gauge field configuration the resulting curvature perturbations exhibit a mild statistical anisotropy which should be sufficiently weak not to conflict with current observational data. The curvature power spectra induced by weakly anisotropic initial states are computed here for the first time when the electric and the magnetic gauge couplings evolve at different rates as it happens, for instance, in the relativistic theory of van der Waals interactions. [...]
arXiv:1601.03556; CERN-PH-TH-2015-196.- 2016 - 27 p. - Published in : Phys. Rev. D 93 (2016) 043543 Fulltext: PDF; External link: Preprint

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2016-01-11
08:24
The Virtual Diphoton Excess / Stolarski, Daniel (CERN ; Ottawa Carleton Inst. Phys.) ; Vega-Morales, Roberto (Granada U., Theor. Phys. Astrophys.)
Interpreting the excesses around 750 GeV in the diphoton spectra to be the signal of a new heavy scalar decaying to photons, we point out the possibility of looking for correlated signals with virtual photons. In particular, we emphasize that the effective operator that generates the diphoton decay will also generate decays to two leptons and a photon, as well as to four leptons, independently of the new resonance couplings to $Z\gamma$ and $ZZ$. [...]
arXiv:1601.02004; CERN-TH-2016-005.- 2016 - 8 p. - Published in : Phys. Rev. D 93 (2016) 055008 Fulltext: PDF; External link: Preprint

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2016-01-08
07:48
Mean distribution approach to spin and gauge theories / Akerlund, Oscar (Zurich, ETH) ; de Forcrand, Philippe (Zurich, ETH ; CERN)
We formulate self-consistency equations for the distribution of links in spin models and of plaquettes in gauge theories. This improves upon known mean-field, mean-link, and mean-plaquette approximations in such that we self-consistently determine all moments of the considered variable instead of just the first. [...]
arXiv:1601.01175; CERN-PH-TH-2015-291.- 2016 - 11 p. - Published in : Nucl. Phys. B 905 (2016) 1-15 Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint

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2015-12-24
08:39
Trinification can explain the di-photon and di-boson LHC anomalies / Pelaggi, Giulio Maria (Pisa U. ; INFN, Pisa) ; Strumia, Alessandro (Pisa U. ; INFN, Pisa ; CERN) ; Vigiani, Elena (Pisa U. ; INFN, Pisa)
LHC data show a diphoton excess at 750 GeV and a less significant diboson excess around 1.9 TeV. We propose trinification as a common source of both anomalies. [...]
arXiv:1512.07225; CERN-PH-TH-2015-311; IFUP-TH-2015.- 2016 - 14 p. - Published in : J. High Energy Phys. 03 (2016) 025 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2015-12-19
08:34
Post-Inflationary Gravitino Production Revisited / Ellis, John (King's Coll. London ; CERN) ; Garcia, Marcos A G (Minnesota U., Theor. Phys. Inst.) ; Nanopoulos, Dimitri V (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A (Minnesota U., Theor. Phys. Inst.) ; Peloso, Marco (Minnesota U., Theor. Phys. Inst.)
We revisit gravitino production following inflation. As a first step, we review the standard calculation of gravitino production in the thermal plasma formed at the end of post-inflationary reheating when the inflaton has completely decayed. [...]
arXiv:1512.05701; KCL-PH-TH-2015-46; LCTS-2015-33; CERN-PH-TH-2015-239; ACT-10-15; MI-TH-1541; UMN-TH-3511-15; FTPI-MINN-15-48.- 2016 - 34 p. - Published in : J. Cosmol. Astropart. Phys. 03 (2016) 008 Fulltext: PDF; IOP Open Access article: PDF; External link: Preprint

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2015-12-11
08:17
ALPtraum: ALP production in proton beam dump experiments / Döbrich, Babette (CERN) ; Jaeckel, Joerg (U. Heidelberg, ITP) ; Kahlhoefer, Felix (DESY) ; Ringwald, Andreas (DESY) ; Schmidt-Hoberg, Kai (DESY)
With their high beam energy and intensity, existing and near-future proton beam dumps provide an excellent opportunity to search for new very weakly coupled particles in the MeV to GeV mass range. One particularly interesting example is a so-called axion-like particle (ALP), i.e. [...]
arXiv:1512.03069; CERN-PH-TH-2015-293; DESY 15-237.- 2016 - 21 p. - Published in : J. High Energy Phys. 02 (2016) 018 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2015-12-09
09:31
Renormalization of Horava Gravity / Barvinsky, Andrei O (Lebedev Inst. ; Tomsk State U. ; British Columbia U.) ; Blas, Diego (CERN) ; Herrero-Valea, Mario (Madrid, IFT ; Madrid, Autonoma U.) ; Sibiryakov, Sergey M (CERN ; IPT, Lausanne ; Moscow, INR) ; Steinwachs, Christian F (Freiburg U.)
We prove perturbative renormalizability of projectable Horava gravity. The key element of the argument is the choice of a gauge which ensures the correct anisotropic scaling of the propagators and their uniform falloff at large frequencies and momenta. [...]
arXiv:1512.02250; CERN-PH-TH-2015-287; INR-TH-2015-032; IFT-UAM-CSIC-15-127; FTUAM-15-44.- 2016 - 35 p. - Published in : Phys. Rev. D 93 (2016) 064022 Fulltext: PDF; External link: Preprint

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