# OpenAccess

 2020-03-2613:27 [PUBDB-2020-01252] Report/Journal Article Wittbrodt, J. 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. [...] OpenAccess: PDF PDF (PDFA); 2020-03-2310:55 [PUBDB-2020-01206] Report/Internal Report Ebert, M. Subsequent Titanium Coating of RF Input Coupler Windows [DESY-Technical-Note-20-01] 15 pp. (2020) [10.3204/PUBDB-2020-01206]   OpenAccess: PDF PDF (PDFA); 2020-03-1815:14 [PUBDB-2020-01104] Journal Article et al Anisotropic and heterogeneous dynamics in an aging colloidal gel Soft matter 16(11), 2864-2872 (2020) [10.1039/C9SM02230A]   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. [...] Fulltext: PDF PDF (PDFA); Published on 2020-02-20. Available in OpenAccess from 2021-02-20.: PDF PDF (PDFA); 2020-03-1713:42 [PUBDB-2020-01085] Preprint/Report Westphal, A. A landscape of orientifold vacua [arXiv:2003.04902; DESY-20-046]   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 [...] OpenAccess: PDF PDF (PDFA); 2020-03-1713:34 [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]   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}. [...] OpenAccess: PDF PDF (PDFA); 2020-03-1712:52 [PUBDB-2020-01083] Preprint/Report Jegerlehner, F. $\alpha_{QED, eff}$(s) for precision physics at the FCC-ee/ILC [DESY-19-074]   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.. OpenAccess: PDF PDF (PDFA); 2020-03-1712:05 [PUBDB-2020-01081] Preprint/Report et al The landscape of QCD axion models [arXiv:2003.01100; DESY-20-036]   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. [...] OpenAccess: PDF PDF (PDFA); 2020-03-1711:41 [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:10.22323/1.375.001314th International Symposium on Radiative Corrections, Palais des PapesPalais des Papes, Avignon, 9 Sep 2019 - 13 Sep 2019 Sissa Medialab Trieste, Italy PoS(RADCOR2019)013 (2019) [10.22323/1.375.0013]   We present results for the heavy-fermionic corrections to the non-singlet heavy-quark form factors at three-loop order recently obtained.. OpenAccess: PDF PDF (PDFA); 2020-03-1709:49 [PUBDB-2020-01077] Report/Journal Article Lipatov, A. 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. [...] OpenAccess: PDF PDF (PDFA); 2020-03-1709:45 [PUBDB-2020-01076] Preprint/Report van de Vis, J. Higgs Inflation as Nonlinear Sigma Model and Scalaron as its $\sigma$-meson [arXiv:2002.11739; DESY-20-031]   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. [...] OpenAccess: PDF PDF (PDFA);