1,721,179 research outputs found
Search for Rare to Open-Charm Two-Body Decays of Baryons at LHCb
Get PDFA search for the rare two-body decays and is performed with proton-proton collision data, corresponding to an integrated luminosity of 6, collected by the LHCb experiment at a center-of-mass energy of 13 TeV. The decay is seen with a statistical significance of 5.5 standard deviations, and constitutes the discovery for this decay. The branching fraction, measured using the decay for normalization, is \begin{equation*} B(\Lambda_b\rightarrow D^0 \Lambda) = (9.9 \pm 2.3 \pm 1.6 \pm 1.1) \times 10^{-6} \,, \end{equation*} where the uncertainties are statistical, systematic, and external, respectively. An excess of candidates w.r.t. the background is observed with a statistical significance of 1.8 standard deviations and is used to estimate the upper limit \begin{equation*} \frac{f_{\Xi^0_b}}{f_{\Lambda_b}} \times \frac{B{(\Xi^0_c \rightarrow D^0\Lambda)}}{B{(\Lambda_b\rightarrow D^0\Lambda})} < 0.5 \quad (\text{CL}\,=\,95\,\%) \,, \end{equation*} where is the ratio of the fragmentation fractions of -quarks into and baryons
Inverted CERN School of Computing 2020
No full text"Leaving no room for a lower-level language", this has always been the declared mantra of the C++ language development. At the same time C++ is an old language and its legacy affects possible performance improvements in the STL due to ABI stability concerns. ABI stands for "Application Binary Interface" and its stability is often put over performance on the one hand while on the other hand, "ABI" or even its stability is not mentioned a single time in the entire C++ standard.
In this talk I will explain what ABI stability means, why it is not mentioned in the standard but is still lethal to many proposals, and discuss some recent implications. I will not be able to present solutions to the dilemma; the hope is to encourage attendees to make their mind and to attend ongoing discussions about this vital topic
Walking Your Frog Fast in 4 LoC
Get PDFGiven two polygonal curves, there are many ways to define a notion of
similarity between them. One popular measure is the Fr\'echet distance which
has many desirable properties but is notoriously expensive to calculate,
especially for non-trivial metrics. In 1994, Eiter and Mannila introduced the
discrete Fr\'echet distance which is much easier to implement and approximates
the continuous Fr\'echet distance with a quadratic runtime overhead. However,
this algorithm relies on recursions and is not well suited for modern hardware.
To that end, we introduce the Fast Fr\'echet Distance algorithm, a
recursion-free algorithm that calculates the discrete Fr\'echet distance with a
linear memory overhead and that can utilize modern hardware more effectively.
We showcase an implementation with only four lines of code and present
benchmarks of our algorithm running fast on modern CPUs and GPGPUs.Comment: 22 pages, 8 figures, a lot of fu
PyTorch and automatic differentiation
Get PDFI will explain automatic differentiation for the gifted amateur and how to use it in the PyTorch framework. You don't have to know the PyTorch framework but some experience with NumPy could help to follow the tutorial session. I would like to keep the session interactive but you will not need to run code on your laptops. Instead, I will present code snippets, discuss them and thus introduce some common pitfalls when using PyTorch. In the end I hope that you understand better what happens behind the curtain of PyTorch (and other autodiff libraries), helping you to more effectively debug your every day code
Discrete Symmetries in Particle, Nuclear and Atomic Physics and implications for our Universe
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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