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

Record dettagliato - Record simili
2015-05-25
07:25
Precise determination of the Higgs mass in supersymmetric models with vectorlike tops and the impact on naturalness in minimal GMSB / Nickel, Kilian (Bonn U.) ; Staub, Florian (CERN)
We present a precise analysis of the Higgs mass corrections stemming from vectorlike top partners in supersymmetric models. We reduce the theoretical uncertainty compared to previous studies in the following aspects: (i) including the one-loop threshold corrections to SM gauge and Yukawa couplings due to the presence of the new states to obtain the $\bar{\text{DR}}$ parameters entering all loop calculations, (ii) including the full momentum dependence at one-loop, and (iii) including all two-loop corrections but the ones involving $g_1$ and $g_2$. [...]
arXiv:1505.06077; BONN-TH-2015-07; CERN-PH-TH-2015-123.- 2015 - 64 p. - Published in : J. High Energy Phys. 07 (2015) 139 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

Record dettagliato - Record simili
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

Record dettagliato - Record simili
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

Record dettagliato - Record simili
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

Record dettagliato - Record simili
2015-03-25
18:10
Constraining Dark Sectors with Monojets and Dijets / Chala, Mikael (DESY) ; Kahlhoefer, Felix (DESY) ; McCullough, Matthew (CERN) ; Nardini, Germano (DESY) ; Schmidt-Hoberg, Kai (DESY)
We consider dark sector particles (DSPs) that obtain sizeable interactions with Standard Model fermions from a new mediator. While these particles can avoid observation in direct detection experiments, they are strongly constrained by LHC measurements. [...]
arXiv:1503.05916; DESY 15-036; CERN-PH-TH-2015-057.- 2015 - 28 p. - Published in : J. High Energy Phys. 07 (2015) 089 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

Record dettagliato - Record simili
2015-03-25
18:07
Doubly Self-Dual Actions in Various Dimensions / Ferrara, S (CERN ; Frascati ; UCLA) ; Sagnotti, A (CERN ; INFN, Pisa ; Pisa U.) ; Yeranyan, A (Frascati ; Enrico Fermi Ctr., Rome)
The self-duality of the N=1 supersymmetric Born--Infeld action implies a double self-duality of the tensor multiplet square-root action when the scalar and the antisymmetric tensor are interchanged via Poincare' duality. We show how this phenomenon extends to D space-time dimensions for non-linear actions involving pairs of forms of rank p and D-p-2. [...]
arXiv:1503.04731; CERN-PH-TH-2015-050.- 2015 - 17 p. - Published in : J. High Energy Phys. 2015 (2015) 51 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

Record dettagliato - Record simili
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

Record dettagliato - Record simili
2015-03-13
07:48
Light stops, blind spots, and isospin violation in the MSSM / Crivellin, Andreas (CERN ; Bern U.) ; Hoferichter, Martin (Bern U. ; Darmstadt, Tech. Hochsch. ; Darmstadt, EMMI) ; Procura, Massimiliano (Bern U. ; Vienna U.) ; Tunstall, Lewis C (Bern U.)
In the framework of the MSSM, we examine several simplified models where only a few superpartners are light. This allows us to study WIMP--nucleus scattering in terms of a handful of MSSM parameters and thereby scrutinize their impact on dark matter direct-detection experiments. [...]
arXiv:1503.03478; UWTHPH-2015-5; CERN-PH-TH-2015-047.- 2015 - 35 p. - Published in : J. High Energy Phys. 07 (2015) 129 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

Record dettagliato - Record simili
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 Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint

Record dettagliato - Record simili