CERN Accelerating science

TH Articles

Senast inlagda poster:
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 Geneva : CERN, 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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2016-03-09
09:00
Linear Versus Non-linear Supersymmetry, in General / Ferrara, Sergio (CERN ; INFN, Italy ; UCLA) ; Kallosh, Renata (Stanford U., ITP ; Stanford U., Phys. Dept.) ; Van Proeyen, Antoine (Leuven U.) ; Wrase, Timm (Vienna, Tech. U.)
We study superconformal and supergravity models with constrained superfields. The underlying version of such models with all unconstrained superfields and linearly realized supersymmetry is presented here, in addition to the physical multiplets there are Lagrange multiplier (LM) superfields. [...]
arXiv:1603.02653; CERN-TH-2016-052; TUW-16-05.- Geneva : CERN, 2016 - Published in : J. High Energy Phys. 04 (2016) 065 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2016-03-02
11:20
Photon Mass Limits from Fast Radio Bursts / Bonetti, Luca (Orleans U. ; LPCE, Orleans) ; Ellis, John (King's Coll. London ; CERN) ; Mavromatos, Nikolaos E (King's Coll. London ; CERN) ; Sakharov, Alexander S (New York U. ; Manhattan Coll., Riverdale ; CERN) ; Sarkisyan-Grinbaum, Edward K G (CERN ; Texas U., Arlington) ; Spallicci, Alessandro D A M (Orleans U. ; LPCE, Orleans)
The frequency-dependent time delays in fast radio bursts (FRBs) can be used to constrain the photon mass, if the FRB redshifts are known, but the similarity between the frequency dependences of dispersion due to plasma effects and a photon mass complicates the derivation of a limit on $m_\gamma$. The redshift of FRB 150418 has been measured to $\sim 2$% and its dispersion measure (DM) is known to $\sim 0.1$%, but the strength of the constraint on $m_\gamma$ is limited by uncertainties in the modelling of the host galaxy and the Milky Way, as well as possible inhomogeneities in the intergalactic medium (IGM). [...]
arXiv:1602.09135; KCL-PH-TH-2016-08; LCTS-2016-06; CERN-TH-2016-044.- Geneva : CERN, 2016 - 10 p. - Published in : Phys. Lett. B 757 (2016) 548-552 Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint

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2016-02-11
08:10
On the gravitational wave production from the decay of the Standard Model Higgs field after inflation / Figueroa, Daniel G (CERN) ; García-Bellido, Juan (Madrid, IFT) ; Torrentí, Francisco (Madrid, IFT)
During or towards the end of inflation, the Standard Model (SM) Higgs forms a condensate with a large amplitude. Following inflation, the condensate oscillates, decaying non-perturbatively into the rest of the SM species. [...]
arXiv:1602.03085; IFT-UAM-CSIC-16-012; CERN-TH-2016-031.- Geneva : CERN, 2016 - 16 p. - Published in : Phys. Rev. D 93 (2016) 103521 Fulltext: PDF; External link: Preprint

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2016-02-08
07:34
Symmetries for SM Alignment in multi-Higgs Doublet Models / Pilaftsis, Apostolos (Manchester U. ; CERN)
We derive the complete set of maximal symmetries for Standard Model (SM) alignment that may occur in the tree-level scalar potential of multi-Higgs Doublet Models, with $n > 2$ Higgs doublets. Our results generalize the symmetries of SM alignment, without decoupling of large mass scales or fine-tuning, previously obtained in the context of two-Higgs Doublet Models..
arXiv:1602.02017; MAN-HEP-2016-03; CERN-TH-2016-057.- Geneva : CERN, 2016 - 8 p. - Published in : Phys. Rev. D 93 (2016) 075012 Fulltext: PDF; External link: Preprint

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2016-02-06
07:35
The Price of an Electroweak Monopole / Ellis, John (King's Coll. London ; CERN) ; Mavromatos, Nick E (King's Coll. London ; CERN) ; You, Tevong (Cambridge U., DAMTP)
In a recent paper, Cho, Kim and Yoon (CKY) have proposed a version of the SU(2) $\times$ U(1) Standard Model with finite-energy monopole and dyon solutions. The CKY model postulates that the effective U(1) gauge coupling $\to \infty$ very rapidly as the Englert-Brout-Higgs vacuum expectation value $\to 0$, but in a way that is incompatible with LHC measurements of the Higgs boson $H \to \gamma \gamma$ decay rate. [...]
arXiv:1602.01745; KCL-PH-TH-2016-04; LCTS-2016-03; CERN-TH-2016-026; CAVENDISH-HEP-16-02; DAMTP-2016-20.- Geneva : CERN, 2016 - 15 p. - Published in : Phys. Lett. B 756 (2016) 29-35 Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint

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2016-02-04
08:22
On the maximal diphoton width / Salvio, Alberto (CERN) ; Staub, Florian (CERN) ; Strumia, Alessandro (CERN ; INFN, Pisa ; Pisa U.) ; Urbano, Alfredo (CERN)
Motivated by the 750 GeV diphoton excess found at LHC, we compute the maximal width into $\gamma\gamma$ that a neutral scalar can acquire through a loop of charged fermions or scalars as function of the maximal scale at which the theory holds, taking into account vacuum (meta)stability bounds. We show how an extra gauge symmetry can qualitatively weaken such bounds, and explore collider probes and connections with Dark Matter..
arXiv:1602.01460; CERN-TH-2016-028.- Geneva : CERN, 2016 - 16 p. - Published in : J. High Energy Phys. 03 (2016) 214 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.- Geneva : CERN, 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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2016-02-04
08:20
Assessing the role of nuclear effects in the interpretation of the MiniBooNE low-energy anomaly / Ericson, M (Lyon, IPN ; CERN) ; Garzelli, M V (Hamburg U., Inst. Theor. Phys. II) ; Giunti, C (INFN, Turin) ; Martini, M (IRFU, SPhN, Saclay)
We study the impact of the effect of multinucleon interactions in the reconstruction of the neutrino energy on the fit of the MiniBooNE data in terms of neutrino oscillations. We obtain some improvement of the fit of the MiniBooNE low-energy excess in the framework of two-neutrino oscillations and a shift of the allowed region in the $\sin^2 2\vartheta$--$\Delta{m}^2$ plane towards smaller values of $\sin^2 2\vartheta$ and larger values of $\Delta{m}^2$. [...]
arXiv:1602.01390; CERN-TH-2016-025; DESY 16-023.- Geneva : CERN, 2016 - 13 p. - Published in : Phys. Rev. D 93 (2016) 073008 Fulltext: PDF; External link: Preprint

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2016-02-02
07:36
Specialized minimal PDFs for optimized LHC calculations / Carrazza, Stefano (Milan U. ; INFN, Milan ; CERN) ; Forte, Stefano (Milan U. ; INFN, Milan) ; Kassabov, Zahari (Milan U. ; INFN, Milan ; Turin U. ; INFN, Turin) ; Rojo, Juan (Oxford U., Theor. Phys.)
We present a methodology for the construction of parton distribution functions (PDFs) designed to provide an accurate representation of PDF uncertainties for specific processes or classes of processes with a minimal number of PDF error sets: specialized minimal PDF sets, or SM-PDFs. We construct these SM-PDFs in such a way that sets corresponding to different input processes can be combined without losing information, specifically on their correlations, and that they are robust upon smooth variations of the kinematic cuts. [...]
arXiv:1602.00005; CERN-PH-TH-2015-243; TIF-UNIMI-2015-13; OUTP-15-24P.- Geneva : CERN, 2016 - 30 p. - Published in : Eur. Phys. J. C 76 (2016) 205 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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