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2017-06-26
12:34
OpenAccess [PUBDB-2017-06090] Journal Article
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Nuclear Resonant Surface Diffraction of Synchrotron Radiation
ddc:550
Nuclear resonant x-ray diffraction in grazing incidence geometry is used to determine the lateral magnetic configuration in a one-dimensional lattice of ferromagnetic nanostripes. During magnetic reversal, strong nuclear superstructure diffraction peaks appear in addition to the electronic ones due to an antiferromagnetic order in the nanostripe lattice [...]
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2017-06-23
13:36
OpenAccess [PUBDB-2017-05996] Journal Article
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Crystallographic and SAXS studies of S -adenosyl- L -homocysteine hydrolase from Bradyrhizobium elkanii
IUCrJ 4(3), 271 - 282 (2017) [10.1107/S2052252517002433]  GO
ddc:530
S-Adenosyl-L-homocysteine hydrolase (SAHase) from the symbiotic bacterium Bradyrhizobium elkanii (BeSAHase) was crystallized in four ligand complexes with (i) mixed adenosine (Ado) and cordycepin (Cord; 3′-deoxyadenosine), (ii) adenine (Ade), (iii) Ado and (iv) mixed 2′-deoxyadenosine (2′-dAdo) and Ade. The crystal structures were solved at resolutions of 1.84, 1.95, 1.95 and 1.54 Å, respectively. [...]
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2017-06-23
13:10
OpenAccess [PUBDB-2017-05993] Journal Article
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Signatures of Dirac and Majorana sterile neutrinos in trilepton events at the LHC
ddc:530
Heavy sterile neutrinos with masses below MW can induce trilepton events at the 14 TeV LHC through purely leptonic $W$ decays of $W^{±}→ e^{±}e^{±}μ^{∓}ν$ and $μ^{±}μ^{±}e^{∓}ν$ where the heavy neutrino will be in an intermediate state on its mass shell. Discovery and exclusion limits for the heavy neutrinos are found using both cut-and-count (CC) and multivariate analysis (MVA) methods in this study [...]
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2017-06-23
13:04
OpenAccess [PUBDB-2017-05992] Report/Journal Article
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Improved determination of the Higgs mass in the MSSM with heavy superpartners
[DESY-17-033; arXiv:1703.08166] ddc:530
We present several advances in the effective field theory calculation of the Higgs mass in MSSM scenarios with heavy superparticles. In particular, we compute the dominant two-loop threshold corrections to the quartic Higgs coupling for generic values of the relevant SUSY-breaking parameters, including all contributions controlled by the strong gauge coupling and by the third-family Yukawa couplings. [...]
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2017-06-23
13:01
OpenAccess [PUBDB-2017-05991] Report/Journal Article
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Exact deconstruction of the 6D (2,0) theory
[DESY-17-030; arXiv:1704.02986] ddc:530
The dimensional-deconstruction prescription of Arkani-Hamed, Cohen, Kaplan, Karch and Motl provides a mechanism for recovering the $A$-type (2,0) theories on $T^2$, starting from a four-dimensional $\mathcal N=2$ circular-quiver theory. We put this conjecture to the test using two exact-counting arguments: In the decompactification limit, we compare the Higgs-branch Hilbert series of the 4D $\mathcal N=2$ quiver to the 'half-BPS' limit of the (2,0) superconformal index. [...]
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2017-06-23
12:57
OpenAccess [PUBDB-2017-05989] Report/Journal Article
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Nucleon Structure Functions from Operator Product Expansion on the Lattice
[ADP-17-09-T1015; DESY-17-027; EDINBURGH-2017-04; LIVERPOOL-LTH-1122; arXiv:1703.01153] ddc:550
Deep-inelastic scattering, in the laboratory and on the lattice, is most instructive for understanding how the nucleon is built from quarks and gluons. The long-term goal is to compute the associated structure functions from first principles. [...]
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2017-06-23
12:51
OpenAccess [PUBDB-2017-05986] Report/Journal Article
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Double hard scattering without double counting
[DESY-17-013; NIKHEF-2017-007; arXiv:1702.06486] ddc:530
Double parton scattering in proton-proton collisions includes kinematic regions in which two partons inside a proton originate from the perturbative splitting of a single parton. This leads to a double counting problem between single and double hard scattering. [...]
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2017-06-23
12:47
OpenAccess [PUBDB-2017-05985] Preprint/Report
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Towards the exact Bremsstrahlung function of ABJM theory
[arXiv:1705.10780]
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We present the three-loop calculation of the Bremsstrahlung function associated to the 1/2-BPS cusp in ABJM theory, including color subleading corrections. Using the BPS condition we reduce the computation to that of a cusp with vanishing angle. [...]
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2017-06-23
12:44
OpenAccess [PUBDB-2017-05984] Report/Journal Article
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Simplified dark matter models with two Higgs doublets: I. Pseudoscalar mediators
[CERN-TH-2017-011; DESY-17-010; arXiv:1701.07427] ddc:530
We study a new class of renormalisable simplified models for dark matter searches at the LHC that are based on two Higgs doublet models with an additional pseudoscalar mediator. In contrast to the spin-0 simplified models employed in analyses of Run I data these models are self-consistent, unitary and bounds from Higgs physics typically pose no constraints. [...]
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2017-06-23
12:41
OpenAccess [PUBDB-2017-05983] Report/Journal Article

Revisiting the dilatation operator of the Wilson?Fisher fixed point
[DESY-17-002; arXiv:1701.04830] ddc:530
We revisit the order $\varepsilon$ dilatation operator of the Wilson-Fisher fixed point obtained by Kehrein, Pismak, and Wegner in light of recent results in conformal field theory. Our approach is algebraic and based only on symmetry principles. [...]
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