OpenAccess

 2020-02-1412:59 [PUBDB-2020-00741] Report/Journal Article Lukyanov, S. L. Spectrum of the reflection operators in different integrable structures [DESY-19-168] Journal of high energy physics 2020(2), 29 (2020) [10.1007/JHEP02(2020)029]   The reflection operators are the simplest examples of the non-local integrals of motion, which appear in many interesting problems in integrable CFT. For the so- called Fateev, quantum AKNS, paperclip and KdV integrable structures, they are built from the (chiral) reflection S-matrices for the Liouville and cigar CFTs. [...] OpenAccess: PDF PDF (PDFA); 2020-02-1412:54 [PUBDB-2020-00740] Report/Journal Article Westphal, A. Flattened axion monodromy beyond two derivatives [DESY-19-160] Physical review / D D 101(4), 043501 (2020) [10.1103/PhysRevD.101.043501]   We study string inspired two-field models of large-field inflation based on axion monodromy in the presence of an interacting heavier modulus. This class of models has enough structure to approximate at least part of the backreaction effects known in full string theory, such as kinetic mixing with the axion, and flattening of the scalar potential. [...] OpenAccess: PDF PDF (PDFA); 2020-02-1412:52 [PUBDB-2020-00739] Report/Journal Article Pokorski, S. Chiral Froggatt-Nielsen models, gauge anomalies and flavourful axions [DESY-19-154] Journal of high energy physics 2020(1), 191 (2020) [10.1007/JHEP01(2020)191]   We study UV-complete Froggatt-Nielsen-like models for the generation of mass and mixing hierarchies, assuming that the integrated heavy fields are chiral with respect to an abelian Froggatt-Nielsen symmetry. It modifies the mixed anomalies with respect to the Standard Model gauge group, which opens up the possibility to gauge the Froggatt-Nielsen symmetry without the need to introduce additional spectator fermions, while keeping mass matrices usually associated to anomalous flavour symmetries. [...] OpenAccess: PDF PDF (PDFA); 2020-02-1412:45 [PUBDB-2020-00738] Report/Journal Article et al Invisible and displaced dark matter signatures at Belle II [DESY-19-141, OUTP-19-10P, TTK-19-46] Journal of high energy physics 2020(2), 39 (2020) [10.1007/JHEP02(2020)039]   Many dark matter models generically predict invisible and displaced signatures at Belle II, but even striking events may be missed by the currently implemented search programme because of inefficient trigger algorithms. Of particular interest are final states with a single photon accompanied by missing energy and a displaced pair of electrons, muons, or hadrons. [...] OpenAccess: PDF PDF (PDFA); 2020-02-1412:42 [PUBDB-2020-00737] Report/Journal Article et al Testing the Seesaw Mechanism and Leptogenesis with Gravitational Waves [DESY-19-138] Physical review letters 124(4), 041804 (2020) [10.1103/PhysRevLett.124.041804]   We present the possibility that the seesaw mechanism with thermal leptogenesis can be tested using the stochastic gravitational background. Achieving neutrino masses consistent with atmospheric and solar neutrino data, while avoiding nonperturbative couplings, requires right handed neutrinos lighter than the typical scale of grand unification. [...] OpenAccess: PDF PDF (PDFA); 2020-02-1412:35 [PUBDB-2020-00736] Report/Journal Article Talbert, J. Finite family groups for fermionic and leptoquark mixing patterns [DESY-19-091] Journal of high energy physics 2020(1), 194 (2020) [10.1007/JHEP01(2020)194]   We employ a bottom-up and model-independent technique to search for non-Abelian discrete flavour symmetries capable of predicting viable CKM and PMNS matrices alongside of special patterns of leptoquark couplings. In particular, we analyze patterns de- rived when an ultra-violet flavour theory is assumed to break to global Abelian symmetries in Standard Model fermion masses and new Yukawa-like terms sourced by the leptoquark representation. [...] OpenAccess: PDF PDF (PDFA); 2020-02-1412:32 [PUBDB-2020-00735] Report/Journal Article Stienemeier, P. Gluons and sea quarks in the proton at low scales [DESY-19-068]   We study the evolution of parton distributions down to low scales by considering several of their Mellin moments. For the initial conditions, we use a broad array of current parton density fits. [...] OpenAccess: PDF PDF (PDFA); 2020-02-1412:30 [PUBDB-2020-00734] Report/Journal Article Sobko, E. Superconformal blocks: general theory [DESY-19-057] Journal of high energy physics 2020(1), 159 (2020) [10.1007/JHEP01(2020)159]   In this work we launch a systematic theory of superconformal blocks for four­point functions of arbitrary supermultiplets. Our results apply to a large class of superconformal field theories including 4-dimensional models with any number $\mathcal{N}$ of supersymmetries. [...] OpenAccess: PDF PDF (PDFA); 2020-02-1314:32 [PUBDB-2020-00723] Report et al Monte Carlo event generators for high energy particle physics event simulation [arXiv:1902.01674; MCnet-19-02] 7 pp. (2019) [10.3204/PUBDB-2020-00723]   Monte Carlo event generators (MCEGs) are the indispensable workhorses of particle physics, bridging the gap between theoretical ideas and first-principles calculations on the one hand, and the complex detector signatures and data of the experimental community on the other hand. All collider physics experiments are dependent on simulated events by MCEG codes such as Herwig, Pythia, Sherpa, POWHEG, and MG5_aMC@NLO to design and tune their detectors and analysis strategies. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2020-02-1313:58 [PUBDB-2020-00720] Report/Contribution to a conference proceedings et al TMD parton distributions from parton showers [arXiv:1907.09441] 27th International Workshop on Deep Inelastic Scattering and Related Subjects, DIS2019, TorinoTorino, Italy, 8 Apr 2019 - 12 Apr 2019Contributions / Info 134 pp. (2019) [10.22323/1.352.0134]   We present the determination of Transverse Momentum Dependent (TMD) parton distributions from Monte Carlo parton showers. We investigate the effective TMD distributions obtained from the PYTHIA8 and HERWIG6 parton showers and compare them to the TMD distributions determined within the Parton Branching method.. OpenAccess: PDF PDF (PDFA); External link: Fulltext