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2019-09-09
11:03
arXiv [PUBDB-2019-03263] Preprint/Report
et al
A warped relaxion
[arXiv:1712.07635; DESY-17-103]
We construct a UV completion of the relaxion in a warped extra dimension. We identify the relaxion with the zero mode of the fifth component of a bulk gauge field and show how hierarchically different decay constants for this field can be achieved by different localizations of anomalous terms in the warped space. [...]
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2019-09-06
09:48
OpenAccess [PUBDB-2019-03256] Preprint/Report

A Practical and Consistent Parametrization of Dark Matter Self-Interactions
[DESY-19-137; arXiv:1908.06067]
 GO
Self-interacting dark matter has been proposed to explain the apparent mass deficit in astrophysical small-scale halos, while observations from galaxy clusters suggest that the corresponding cross section depends on the velocity. Accounting for this is often believed to be highly model-dependent with studies mostly focusing on scenarios with light mediators. [...]
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2019-09-05
13:19
OpenAccess [PUBDB-2019-03252] Preprint/Report

Soft corrections to inclusive DIS at four loops and beyond
[arXiv:1908.03071; DESY-19-104; LTH 1212]
Seminar, Meeting location,
Contributions / Info
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We study the threshold corrections to the structure functions in deep-inelastic scattering (DIS) at the fifth logarithmic (N$^4$LL) order of the soft-gluon exponentiation in massless perturbative QCD. Using recent results for the splitting functions and the quark form factor, we derive the fourth-order contribution to the coefficient $f^{\rm q}$ of the form factor and from it the N$^4$LL part of the exponentiation coefficient $B^{\rm DIS}$ in the limit of a large number of colours. [...]
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2019-09-05
13:15
OpenAccess [PUBDB-2019-03251] Report/Journal Article
et al
Several Problems in Particle Physics and Cosmology Solved in One SMASH
[arXiv:1904.05594; DESY-19-056; IFT-UAM/CSIC-19-39; MPP-2019-75; TUM-HEP-1196-19]
The Standard Model (SM) of particle physics is a big success. However, it lacks explanations for cosmic inflation, the matter-anti-matter asymmetry of the Universe, dark matter, neutrino oscillations, and the feebleness of CP violation in the strong interactions. [...]
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2019-09-05
13:13
[PUBDB-2019-03249] Journal Article
et al
Isospin splittings in the decuplet baryon spectrum from dynamical QCD+QED
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2019-09-05
13:08
OpenAccess [PUBDB-2019-03248] Report/Journal Article
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Discrete gauge theories of charge conjugation
[DESY-19-045; arXiv:1903.06662]
We define gauge theories whose gauge group includes charge conjugation as well as standard $\mathrm{SU}(N)$ transformations. When combined, these transformations form a novel type of group with a semidirect product structure. [...]
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2019-09-05
13:05
OpenAccess [PUBDB-2019-03247] Report/Journal Article
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New Physics in $b \to s \ell^+ \ell^-$ confronts new data on Lepton Universality
[arXiv:1903.09632; DESY-19-043; CERN-TH-2019-033; UCI-TR-2019-07]
In light of the very recent updates on the $R_K$ and $R_{K^*}$ measurements from the LHCb and Belle collaborations, we systematically explore here imprints of New Physics in $b \to s \ell^+ \ell^- $ transitions using the language of effective field theories. We focus on effects that violate Lepton Flavour Universality both in the Weak Effective Theory and in the Standard Model Effective Field Theory. [...]
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2019-09-05
13:03
OpenAccess [PUBDB-2019-03246] Report/Journal Article
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Six-Gluon Amplitudes in Planar ${\cal N}=4$ Super-Yang-Mills Theory at Six and Seven Loops
[arXiv:1903.10890; DESY-19-042; HU-EP-19/04; SLAC-PUB-17413]
We compute the six-particle maximally-helicity-violating (MHV) and next-to-MHV (NMHV) amplitudes in planar maximally supersymmetric Yang-Mills theory through seven loops and six loops, respectively, as an application of the extended Steinmann relations and using the cosmic Galois coaction principle. Starting from a minimal space of functions constructed using these principles, we identify the amplitude by matching its symmetries and predicted behavior in various kinematic limits. [...]
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2019-09-05
12:36
OpenAccess [PUBDB-2019-03245] Report/Journal Article
et al
Two-loop splitting in double parton distributions
[arXiv:1902.08019; DESY-19-024; CERN-TH-2019-013]
Double parton distributions (DPDs) receive a short-distance contribution from a single parton splitting to yield the two observed partons. We investigate this mechanism at next-to-leading order (NLO) in perturbation theory. [...]
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2019-09-05
12:30
OpenAccess [PUBDB-2019-03244] Journal Article/Report/Contribution to a conference proceedings

The Role of Positron Polarization for the initial 250 GeV stage of the ILC
[DESY-18-193; arXiv:1811.05263]
The 39th International Conference on High Energy Physics, SeoulSeoul, Korea, 4 Jul 2018 - 11 Jul 20182018-07-042018-07-11
Contributions / Info
Proceedings of Science / International School for Advanced Studies (ICHEP2018), 195 () [10.22323/1.340.0195]  GO
The International Linear Collider is now proposed with a staged machine design, with the first stage at $\sqrt{s}=250$ GeV and an integrated luminosity goal of 2 ab${}^{-1}$. One of the questions for the machine design is the importance of positron polarization. [...]
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