OpenAccess

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2020-03-26
13:27
OpenAccess [PUBDB-2020-01252] Report/Journal Article

Two-real-scalar-singlet extension of the SM: LHC phenomenology and benchmark scenarios
[DESY-19-142]
We investigate the LHC phenomenology of a model where the Standard Model (SM) scalar sector is extended by two real scalar singlets. A ${{\mathbb {Z}}_2} \otimes {{\mathbb {Z}}_2} '$ discrete symmetry is imposed to reduce the number of scalar potential parameters, which is spontaneously broken by the vacuum expectation values of the singlet fields. [...]
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2020-03-23
10:55
OpenAccess [PUBDB-2020-01206] Report/Internal Report

Subsequent Titanium Coating of RF Input Coupler Windows
[DESY-Technical-Note-20-01]
15 pp. () [10.3204/PUBDB-2020-01206]  GO
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2020-03-18
15:14
Embargoed OpenAccess [PUBDB-2020-01104] Journal Article
et al
Anisotropic and heterogeneous dynamics in an aging colloidal gel
Soft matter 16(11), 2864-2872 () [10.1039/C9SM02230A]  GO
We investigate the out-of-equilibrium dynamics of a colloidal gel obtained by quenching a suspension of soft polymer-coated gold nanoparticles close to and below its gelation point using X-ray Photon Correlation Spectroscopy (XPCS). A faster relaxation process emergent from the localized motions of the nanoparticles reveals a dynamically-arrested network at the nanoscale as a key signature of the gelation process. [...]
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2020-03-17
13:42
OpenAccess [PUBDB-2020-01085] Preprint/Report

A landscape of orientifold vacua
[arXiv:2003.04902; DESY-20-046]
 GO
We present a vast landscape of O3/O7 orientifolds that descends from the famous set of complete intersection Calabi-Yau threefolds (CICY). We give distributions of topological data relevant for phenomenology such as the orientifold-odd Hodge numbers, the D3-tadpole, and multiplicities of O3 and O7-planes [...]
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2020-03-17
13:34
OpenAccess [PUBDB-2020-01084] Preprint/Report
et al
Testing binary dynamics in gravity at the sixth post-Newtonian level
[DESY-20-044; DO--TH 20/02; SAGEX--20--06; arXiv:2003.07145]
 GO
We calculate the motion of binary mass systems in gravity up to the sixth post--Newtonian order to the $G_N^3$ terms ab initio using momentum expansions within an effective field theory approach based on Feynman amplitudes in harmonic coordinates. For these contributions we construct a canonical transformation to isotropic and to EOB coordinates at 5PN and agree with the results in the literature \cite{Bern:2019nnu,Damour:2019lcq}. [...]
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2020-03-17
12:52
OpenAccess [PUBDB-2020-01083] Preprint/Report

$\alpha_{QED, eff}$(s) for precision physics at the FCC-ee/ILC
[DESY-19-074]
 GO
Discovering “Physics behind precision” at future linear or circular colliders (ILC/FCC projects) requires improved SM predictions based on more precise input parameters. I will review the role αQED, eff at future collider energies and report on possible progress based on results from low energy machines..
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2020-03-17
12:05
OpenAccess [PUBDB-2020-01081] Preprint/Report
et al
The landscape of QCD axion models
[arXiv:2003.01100; DESY-20-036]
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We review the landscape of QCD axion models. Theoretical constructions that extend the window for the axion mass and couplings beyond conventional regions are highlighted and classified. [...]
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2020-03-17
11:41
OpenAccess [PUBDB-2020-01079] Report/Contribution to a conference proceedings/Contribution to a book
et al
Heavy quark form factors at three loops
[DESY-19-219]
Proceedings of 14th International Symposium on Radiative Corrections — PoS(RADCOR2019) - Sissa Medialab Trieste, Italy, 2019. - ISBN - doi:10.22323/1.375.0013
14th International Symposium on Radiative Corrections, Palais des PapesPalais des Papes, Avignon, 9 Sep 2019 - 13 Sep 20192019-09-092019-09-13
Sissa Medialab Trieste, Italy PoS(RADCOR2019)013 () [10.22323/1.375.0013]  GO
We present results for the heavy-fermionic corrections to the non-singlet heavy-quark form factors at three-loop order recently obtained..
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2020-03-17
09:49
OpenAccess [PUBDB-2020-01077] Report/Journal Article

Prompt $\eta _c$ meson production at the LHC in the NRQCD with $k_T$-factorization
[arXiv:1904.00400; DESY-19-101]
In the framework of the $k_T$-factorization approach, the prompt production of $\eta _c$ mesons at the LHC conditions is studied. Our consideration is based on the off-shell amplitudes for hard partonic subprocesses and on the nonrelativistic QCD (NRQCD) formalism for the formation of bound states. [...]
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2020-03-17
09:45
OpenAccess [PUBDB-2020-01076] Preprint/Report

Higgs Inflation as Nonlinear Sigma Model and Scalaron as its $\sigma$-meson
[arXiv:2002.11739; DESY-20-031]
 GO
We point out that a model with scalar fields with a large nonminimal coupling to the Ricci scalar, such as Higgs inflation, can be regarded as a nonlinear sigma model (NLSM). The $\sigma$-meson, which is induced by quantum corrections, is identified as the scalaron in this model. [...]
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