CERN Accelerating science

TH Articles

Ultimi arrivi:
2015-06-26
17:57
Integrating out lattice gauge fields / Vairinhos, Helvio (ETH, Zurich (main)) ; de Forcrand, Philippe (ETH, Zurich (main) ; CERN)
The sign problem is a major obstacle to our understanding of the phase diagram of QCD at finite baryon density. Several numerical methods have been proposed to tackle this problem, but a full solution to the sign problem is still elusive. [...]
arXiv:1506.07007; CERN-PH-TH-2015-140.- 2015 - 9 p. - Published in : CPOD (2014) , pp. 061 Fulltext: PDF; External link: Preprint

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2015-04-13
07:43
Dark Matter from the Supersymmetric Custodial Triplet Model / Delgado, Antonio (Notre Dame U. ; CERN) ; Garcia-Pepin, Mateo (Barcelona, Autonoma U.) ; Ostdiek, Bryan (Notre Dame U.) ; Quiros, Mariano (Barcelona, Autonoma U. ; ICREA, Barcelona)
The Supersymmetric Custodial Triplet Model (SCTM) adds to the particle content of the MSSM three $SU(2)_L$ triplet chiral superfields with hypercharge $Y=(0,\pm1)$. At the superpotential level the model respects a global $SU(2)_L \otimes SU(2)_R$ symmetry only broken by the Yukawa interactions. [...]
arXiv:1504.02486; CERN-PH-TH-2015-078.- 2015 - 26 p. - Published in : Phys. Rev. D 92 (2015) 015011 Fulltext: PDF; External link: Preprint

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2015-03-25
18:35
Cross-Order Integral Relations from Maximal Cuts / Johansson, Henrik (CERN ; NORDITA ; Stockholm U. ; Uppsala U.) ; Kosower, David A (Caltech ; IPhT, Saclay) ; Larsen, Kasper J (NIKHEF, Amsterdam ; Zurich, ETH) ; Sogaard, Mads (Bohr Inst.)
We study the ABDK relation using maximal cuts of one- and two-loop integrals with up to five external legs. We show how to find a special combination of integrals that allows the relation to exist, and how to reconstruct the terms with one-loop integrals squared. [...]
arXiv:1503.06711; CERN-PH-TH-2014-262; NORDITA-2014-141; UUITP-20-14; CALT-TH-2015-014; SACLAY-IPHT-T14-239; NIKHEF-2014-051.- 2015 - 58 p. - Published in : Phys. Rev. D 92 (2015) 025015 Fulltext: PDF; External link: Preprint

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2015-03-25
18:10
Higgs boson gluon-fusion production in N3LO QCD / Anastasiou, Charalampos (Zurich, ETH) ; Duhr, Claude (CERN ; Louvain U., CP3) ; Dulat, Falko (Zurich, ETH) ; Herzog, Franz (NIKHEF, Amsterdam) ; Mistlberger, Bernhard (Zurich, ETH)
We present the cross-section for the production of a Higgs boson at hadron-colliders at next-to- next-to-next-to-leading order (N3LO) in perturbative QCD. The calculation is based on a method to perform a series expansion of the partonic cross-section around the threshold limit to an arbitrary order. [...]
arXiv:1503.06056; CERN-PH-TH-2015-055; CP3-15-07.- 2015 - 5 p. - Published in : Phys. Rev. Lett. 114 (2015) 212001 Fulltext: PDF; External link: Preprint

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2015-03-13
07:51
Addressing the LHC flavour anomalies with horizontal gauge symmetries / Crivellin, Andreas (CERN) ; D'Ambrosio, Giancarlo (CERN ; INFN, Naples) ; Heeck, Julian (Brussels U.)
We study the impact of an additional $U(1)'$ gauge symmetry with flavour-dependent charges for quarks and leptons on the LHC flavour anomalies observed in $B \to K^* \mu^+\mu^-$, $R(K) = B \to K \mu^+\mu^-/B \to K e^+e^-$, and $h \to \mu\tau$. In its minimal version with two scalar doublets, the resulting model naturally explains the deviations from the Standard Model observed in $B \to K^* \mu^+\mu^-$ and $R(K)$. [...]
arXiv:1503.03477; CERN-PH-TH-2015-046; ULB-TH-15-03.- 2015 - 14 p. - Published in : Phys. Rev. D 91 (2015) 075006 Fulltext: PDF; External link: Preprint

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2015-03-11
07:48
On stability of electroweak vacuum during inflation / Shkerin, Andrey (IPT, Lausanne ; Moscow, INR) ; Sibiryakov, Sergey (IPT, Lausanne ; Moscow, INR ; CERN)
We study Coleman-De Luccia tunneling of the Standard Model Higgs field during inflation in the case when the electroweak vacuum is metastable. We verify that the tunneling rate is exponentially suppressed. [...]
arXiv:1503.02586; CERN-PH-TH-2015-043; INR-TH-2015-008.- 2015 - 9 p. - Published in : Phys. Lett. B 746 (2015) 257-260 Fulltext: PDF; External link: Preprint

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2015-03-05
08:11
Froissart Bound on Inelastic Cross Section Without Unknown Constants / Martin, André (CERN) ; Roy, S M (Tata Inst.)
Assuming that axiomatic local field theory results hold for hadron scattering, Andr\'e Martin and S. M. [...]
arXiv:1503.01261; CERN-PH-TH-2015-035.- 2015 - 9 p. - Published in : Phys. Rev. D 91 (2015) 076006 Fulltext: PDF; External link: Preprint

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2015-02-18
07:43
Robust collider limits on heavy-mediator Dark Matter / Racco, Davide (Geneva U., Dept. Theor. Phys. ; Geneva U., CAP) ; Wulzer, Andrea (Padua U. ; INFN, Padua) ; Zwirner, Fabio (Padua U. ; CERN ; INFN, Padua)
We discuss how to consistently use Effective Field Theories (EFTs) to set universal bounds on heavy-mediator Dark Matter at colliders, without prejudice on the model underlying a given effective interaction. We illustrate the method for a Majorana fermion, universally coupled to the Standard Model quarks via a dimension-6 axial-axial four-fermion operator. [...]
arXiv:1502.04701; CERN-PH-TH-2015-014; DFPD-2015-TH-05.- 2015 - 30 p. - Published in : J. High Energy Phys. 05 (2015) 009 Fulltext: PDF; External link: Preprint

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2015-02-10
08:06
Spot the stop with a b-tag / Ferretti, Gabriele (Chalmers U. Tech.) ; Franceschini, Roberto (CERN) ; Petersson, Christoffer (Chalmers U. Tech. ; Brussels U., PTM ; Intl. Solvay Inst., Brussels) ; Torre, Riccardo (Padua U. ; INFN, Padua)
The LHC searches for light compressed stop squarks have resulted in considerable bounds in the case where the stop decays to a neutralino and a charm quark. However, in the case where the stop decays to a neutralino, a bottom quark and two fermions via an off-shell W-boson, there is currently a significant unconstrained region in the stop-neutralino mass plane, still allowing for stop masses in the range 90-140 GeV. [...]
arXiv:1502.01721; CERN-PH-TH-2015-019; DFPD-2014-TH-03.- 2015 - 6 p. - Published in : Phys. Rev. Lett. 114 (2015) 201801 Fulltext: PDF; External link: Preprint

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2015-01-30
08:57
The Flavour Portal to Dark Matter / Calibbi, Lorenzo (Brussels U.) ; Crivellin, Andreas (CERN) ; Zaldivar, Bryan (Brussels U.)
We present a class of models in which dark matter (DM) is a fermionic singlet under the Standard Model (SM) gauge group but is charged under a symmetry of flavour that acts as well on the SM fermions. Interactions between DM and SM particles are mediated by the scalar fields that spontaneously break the flavour symmetry, the so-called flavons. [...]
arXiv:1501.07268; ULB-TH-15-01; CERN-PH-TH-2015-010.- 2015 - 6 p. - Published in : Phys. Rev. D 92 (2015) 016004 Fulltext: PDF; External link: Preprint

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