J. S. Lange

Bio: J. S. Lange is an academic researcher from University of Hamburg. The author has contributed to research in topics: Large Hadron Collider & Physics. The author has an hindex of 160, co-authored 2083 publications receiving 145919 citations. Previous affiliations of J. S. Lange include National Technical University of Athens & University of Trento.

Observation of ψ(4040) and ψ(4160) decay into ηJ/ψ

Abstract: The cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\eta}J/\ensuremath{\psi}$ between $\sqrt{s}=3.8\text{ }\text{ }\mathrm{GeV}$ and 5.3 GeV is measured via initial state radiation using $980\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data on and around the $\ensuremath{\Upsilon}(nS)(n=1,2,3,4,5)$ resonances collected with the Belle detector at KEKB. Two resonant structures at the $\ensuremath{\psi}(4040)$ and $\ensuremath{\psi}(4160)$ are observed in the $\ensuremath{\eta}J/\ensuremath{\psi}$ invariant mass distribution. Fitting the mass spectrum with the coherent sum of two Breit-Wigner functions, one obtains $\mathcal{B}(\ensuremath{\psi}(4040)\ensuremath{\rightarrow}\ensuremath{\eta}J/\ensuremath{\psi})\ifmmode\cdot\else\textperiodcentered\fi{}{\ensuremath{\Gamma}}_{{e}^{+}{e}^{\ensuremath{-}}}^{\ensuremath{\psi}(4040)}=(4.8\ifmmode\pm\else\textpm\fi{}0.9\ifmmode\pm\else\textpm\fi{}1.5)\text{ }\text{ }\mathrm{eV}$ and $\mathcal{B}(\ensuremath{\psi}(4160)\ensuremath{\rightarrow}\ensuremath{\eta}J/\ensuremath{\psi})\ifmmode\cdot\else\textperiodcentered\fi{}{\ensuremath{\Gamma}}_{{e}^{+}{e}^{\ensuremath{-}}}^{\ensuremath{\psi}(4160)}=(4.0\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\pm\else\textpm\fi{}1.4)\text{ }\text{ }\mathrm{eV}$ for one solution and $\mathcal{B}(\ensuremath{\psi}(4040)\ensuremath{\rightarrow}\ensuremath{\eta}J/\ensuremath{\psi})\ifmmode\cdot\else\textperiodcentered\fi{}{\ensuremath{\Gamma}}_{{e}^{+}{e}^{\ensuremath{-}}}^{\ensuremath{\psi}(4040)}=(11.2\ifmmode\pm\else\textpm\fi{}1.3\ifmmode\pm\else\textpm\fi{}2.1)\text{ }\text{ }\mathrm{eV}$ and $\mathcal{B}(\ensuremath{\psi}(4160)\ensuremath{\rightarrow}\ensuremath{\eta}J/\ensuremath{\psi})\ifmmode\cdot\else\textperiodcentered\fi{}{\ensuremath{\Gamma}}_{{e}^{+}{e}^{\ensuremath{-}}}^{\ensuremath{\psi}(4160)}=(13.8\ifmmode\pm\else\textpm\fi{}1.3\ifmmode\pm\else\textpm\fi{}2.1)\text{ }\text{ }\mathrm{eV}$ for the other solution, where the first errors are statistical and the second are systematic. This is the first measurement of this hadronic transition mode of these two states, and the partial widths to $\ensuremath{\eta}J/\ensuremath{\psi}$ are found to be about 1 MeV. There is no evidence for the $Y(4260)$, $Y(4360)$, $\ensuremath{\psi}(4415)$, or $Y(4660)$ in the $\ensuremath{\eta}J/\ensuremath{\psi}$ final state, and upper limits of their production rates in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation are determined.

Measurement of fiducial and differential W+W− production cross-sections at s√=13 TeV with the ATLAS detector

Abstract: A measurement of fiducial and differential cross-sections for W+W- production in proton-proton collisions at root s = 13 TeV with the ATLAS experiment at the Large Hadron Collider using data corres ...

Search for an H-Dibaryon with a Mass near 2mΛ in Υ(1S) and Υ(2S) Decays

Abstract: We report the results of a high-statistics search for $H$ dibaryon production in inclusive $\ensuremath{\Upsilon}(1S)$ and $\ensuremath{\Upsilon}(2S)$ decays. No indication of an $H$ dibaryon with a mass near the ${M}_{H}=2{m}_{\ensuremath{\Lambda}}$ threshold is seen in either the $H\ensuremath{\rightarrow}\ensuremath{\Lambda}p{\ensuremath{\pi}}^{\ensuremath{-}}$ or $\ensuremath{\Lambda}\ensuremath{\Lambda}$ decay channels and 90% confidence level branching-fraction upper limits are set that are between one and two orders of magnitude below the measured branching fractions for inclusive $\ensuremath{\Upsilon}(1S)$ and $\ensuremath{\Upsilon}(2S)$ decays to antideuterons. Since $\ensuremath{\Upsilon}(1S,2S)$ decays produce flavor-$SU(3)$-symmetric final states, these results put stringent constraints on $H$ dibaryon properties. The results are based on analyses of 102 million $\ensuremath{\Upsilon}(1S)$ and 158 million $\ensuremath{\Upsilon}(2S)$ events collected with the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider.

Search for supersymmetry in events with a τ lepton pair and missing transverse momentum in proton-proton collisions at √ s = 13 TeV

Abstract: A search for the electroweak production of supersymmetric particles in protonproton collisions at a center-of-mass energy of 13TeV is presented in final states with a tau lepton pair. Both hadronic and leptonic decay modes are considered for the tau leptons. Scenarios involving the direct pair production of tau sleptons, or their indirect production via the decays of charginos and neutralinos, are investigated. The data correspond to an integrated luminosity of 35: 9 fb collected with the CMS detector in 2016. The observed number of events is consistent with the standard model background expectation. The results are interpreted as upper limits on the cross section for tau slepton pair production in di ff erent scenarios. The strongest limits are observed in the scenario of a purely left-handed low mass tau slepton decaying to a nearly massless neutralino. Exclusion limits are also set in the context of simpli fi ed models of chargino-neutralino and chargino pair production with decays to tau leptons, and range up to 710 and 630 GeV, respectively.

Determination of the number of ψ(3686) events at BESIII

Abstract: The number of ψ' events accumulated by the BESIII experiment from March 3 through April 14, 2009, is determined by counting inclusive hadronic events. The result is 106.41×(1.00±0.81%)×106. The error is systematic dominant; the statistical error is negligible.

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python

Abstract: SciPy is an open source scientific computing library for the Python programming language. SciPy 1.0 was released in late 2017, about 16 years after the original version 0.1 release. SciPy has become a de facto standard for leveraging scientific algorithms in the Python programming language, with more than 600 unique code contributors, thousands of dependent packages, over 100,000 dependent repositories, and millions of downloads per year. This includes usage of SciPy in almost half of all machine learning projects on GitHub, and usage by high profile projects including LIGO gravitational wave analysis and creation of the first-ever image of a black hole (M87). The library includes functionality spanning clustering, Fourier transforms, integration, interpolation, file I/O, linear algebra, image processing, orthogonal distance regression, minimization algorithms, signal processing, sparse matrix handling, computational geometry, and statistics. In this work, we provide an overview of the capabilities and development practices of the SciPy library and highlight some recent technical developments.

Phd by thesis

Abstract: Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These