# Publications database

 2020-12-0413:05 [PUBDB-2020-04785] Journal Article/Contribution to a conference proceedings Knittel, D. Operating the Belle II Collaborative Services and Tools 24th International Conference on Computing in High Energy and Nuclear Physics, CHEP2019, AdelaideAdelaide, Australia, 4 Nov 2019 - 8 Nov 2019   In 2016 the Belle II collaboration reviewed and consolidated their collaborative services and tools. Services and tools were migrated into the existing IT infrastructure at DESY. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2020-12-0412:02 [PUBDB-2020-04784] Master Thesis Govoni, P. Search for $\it tZq$ in dilepton final states with Machine Learning techniques 55 pp. (2020) [10.3204/PUBDB-2020-04784] = Masterarbeit, Universit`a degli Studi di Milano - Bicocca, 2020   In this work, events in which a single top quark is produced in association with a Z-boson are investigated. Particular focus is on final states in which two leptons originate from the Z boson and the top quark decays hadronically. [...] OpenAccess: PDF PDF (PDFA); 2020-12-0317:09 [PUBDB-2020-04758] Talk (non-conference) (Invited) Quintavalle, L. An integrability-based approach to Multipoint Conformal Blocks Durham journal club, Durham UniversityDurham, Durham University, United Kingdom, 11 Nov 2020 The conformal bootstrap program has proven to be a very effective strategy to obtain bounds and predictions for conformal theories’ observables from symmetry constraints. Almost all the data there produced, however, has been derived by constraining only four-point functions. [...] Restricted: PDF PDF (PDFA); 2020-12-0314:24 [PUBDB-2020-04752] Journal Article et al Plasma channel formation in the knife-like focus of laser beam Journal of plasma physics 86(3), 905860307 (1-24) (2020) [10.1017/S0022377820000458]   The plasma channel formation in the focus of a knife-like nanosecond laser pulse irradiating a gas target is studied theoretically, and in gas-dynamics computer simulations. The distribution of the electromagnetic field in the focus region, obtained analytically, is used to calculate the energy deposition in the plasma, which then is implemented in the magnetohydrodynamic computer code. [...] Restricted: PDF PDF (PDFA); 2020-12-0314:11 [PUBDB-2020-04751] Journal Article et al Gas Density Structure of Supersonic Flows Impinged on by Thin Blades for Laser–Plasma Accelerator Targets Physics of fluids 32(6), 066108 (2020) [10.1063/5.0005888]   Density transition injection is an effective technique for controllably loading electrons into a trapped phase for laser plasma accelerators. One common technique to achieve the required fluid structure is to impinge a thin blade on the plume of a supersonic nozzle. [...] External link: Fulltext 2020-12-0313:32 [PUBDB-2020-04748] Journal Article et al A Compact, High Resolution Energy, and Emittance Diagnostic for Electron Beams Using Active Plasma Lenses Applied physics letters 116(23), 234108 (1-5) (2020) [10.1063/5.0005114]   High-resolution (sub-%), single-shot energy distribution, and emittance measurements of GeV-class electron beams generated by laser plasma accelerators (LPAs) have been enabled through the use of an active plasma lens combined with relatively short dipole magnets. This setup, with only 60 cm between the LPA source and the final diagnostic screen, was facilitated through the use of a replenishable ∼20–40 nm thick liquid crystal plasma mirror to separate remnant laser radiation from the electron beam without emittance degradation. [...] Restricted: PDF PDF (PDFA); 2020-12-0313:18 [PUBDB-2020-04747] Journal Article et al Search for a doubly charged $D D K$ bound state in $ϒ ( 1 S , 2 S )$ inclusive decays and via direct production in $e^+ e^−$ collisions at $\sqrt{s}$ = 10.520, 10.580, and 10.867 GeV [Belle Preprint # 2020-10; KEK Preprint # 2020-11; arXiv:2008.13341] Physical review / D 102(11), 112001 (1-14) (2020) [10.1103/PhysRevD.102.112001]   We report the results of a first search for a doubly-charged $DDK$ bound state, denoted the $R^{++}$, in $\Upsilon(1S)$ and $\Upsilon(2S)$ inclusive decays and via direct production in $e^+e^-$ collisions at $\sqrt{s}$ = 10.520, 10.580, and 10.867 GeV. The search uses data accumulated with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2020-12-0312:46 [PUBDB-2020-04746] Preprint et al Measurement of time-dependent CP violation parameters in $B^0 \to K_0^SK_0^SK_0^S$ decays at Belle [Belle Preprint 2020-17; KEK Preprint 2020-34; arXiv:2011.00793]   We measure the time-dependent $C\!P$ violation parameters in $B^{0} \to K^{0}_{S}K^{0}_{S}K^{0}_{S}$ decays using $772 \times 10^6$ $B {\mkern 1.5mu\overline{\mkern-1.5mu B \mkern-0.1mu}\mkern 0.1mu}$ pairs collected at the $\Upsilon (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The obtained mixing-induced and direct $C\!P$ asymmetries are $-0.71 \pm 0.23~{\rm(stat)} \pm 0.05~{\rm(syst)}$ and $0.12 \pm 0.16~{\rm(stat)} \pm 0.05~{\rm(syst)}$, respectively. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2020-12-0311:58 [PUBDB-2020-04745] Preprint et al Search for lepton-number- and baryon-number-violating tau decays at Belle [Belle Preprint 2020-16; KEK Preprint 2020-33; arXiv:2010.15361]   We search for lepton-number- and baryon-number-violating decays $\tau^{-}\to\overline{p}e^{+}e^{-}$, $pe^{-}e^{-}$, $\overline{p}e^{+}\mu^{-}$, $\overline{p}e^{-}\mu^{+}$, $\overline{p}\mu^{+}\mu^{-}$, and $p\mu^{-}\mu^{-}$ using 921 fb$^{-1}$ of data, equivalent to $(841\pm12)\times 10^6$ $\tau^{+}\tau^{-}$ events, recorded with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. In the absence of a signal, $90\%$ confidence-level upper limits are set on the branching fractions of these decays in the range $(1.8$-$4.0)\times 10^{-8}$. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2020-12-0311:57 [PUBDB-2020-04744] Journal Article et al Corrigendum: An Accurate and Efficient Laser-Envelope Solver for the Modeling of Laser-Plasma Accelerators Plasma physics and controlled fusion 62(8), 089501 (2020) [10.1088/1361-6587/ab9a63]   Corrigendum: "An accurate and efficient laser-envelope solver for themodeling of laser-plasma accelerators ", Plasma Phys. Control [...] OpenAccess: PDF PDF (PDFA);