3,198 research outputs found
Searches for LFV and LNV Decays at LHCb
The paper presents the latest progress on the searches for Lepton Number
Violating (LNV) B Meson decays, the Lepton Flavour Violating (LFV) decay
\Ptau^- \to \Pmu^-\Pmu^-\Pmu^+, and the Lepton and Baryon Number Violating
(LNV and BNV) decays \Ptau^- \to \mu^+ \mu^- \APproton and \Ptau^- \to \mu^-
\mu^- \Pproton at the LHCb. These searches have been performed at a hadron
collider for the first time. In the absence of signal we put upper limits,
which are as follows: , \mathcal{B}(\Ptau^- \to \mu^- \mu^+ \APproton) < 3.4 \times
10^{-7}, \mathcal{B}(\Ptau^- \to \mu^- \mu^- \Pproton) < 4.4 \times 10^{-7}
at 90% CL.Comment: 9 pages, 5 figures, Proceedings of CKM 2012, the 7th International
Workshop on the CKM Unitarity Triangl
Long-distance effects in from Analyticity
We discuss a novel approach to systematically determine the long-distance
contribution to decays in the kinematic region where the
dilepton invariant mass is below the open charm threshold. This approach
provides the most consistent and reliable determination to date and can be used
to compute Standard Model predictions for all observables of interest,
including the kinematic region where the dilepton invariant mass lies between
the and the resonances. We illustrate the power of our
results by performing a New Physics fit to the Wilson coefficient . This
approach is systematically improvable from theoretical and experimental sides,
and applies to other decay modes of the type ,
and .Comment: 10 pages, 5 figure
ML with PTIME complexity guarantees
Implicit Computational Complexity is a line of research where the possibility to inference a valid property for a program implies that the program runs in particular complexity class. Soft type systems are one of the research threads within the field. We present here a soft type system with ML-like polymorphism that enjoys decidable typechecking, type inference and typability problems and gives polynomial time computational guarantees for the running time of typed
programs
Increasing Quality of the Corpus of Frequency Dictionary of Contemporary Polish for Morphosyntactic Tagging of the Polish Language
The paper is devoted to the issue of correction of the erroneous and ambiguous corpus of Frequency Dictionary of Contemporary Polish (FDCP) and its application to morphosyntactic tagging of the Polish language. Several stages of corpus transformation are presented and baseline part-of-speech tagging algorithms are evaluated, too
A Case Study of Algorithms for Morphosyntactic Tagging of Polish Language
The paper presents an evaluation of several part-of-speech taggers, representing main tagging algorithms, applied to corpus of frequency dictionary of the contemporary Polish language. We report our results considering two tagging schemes: IPI PAN positional tagset and its simplified version. Tagging accuracy is calculated for different training sets and takes into account many subcategories (accuracy on known and unknown tokens, word segments, sentences etc.) The comparison of results with other inflecting and analytic languages is done. Performance aspects (time demands) of used tagging tools are also discussed
Restricted Positive Quantification Is Not Elementary
We show that a restricted variant of constructive predicate logic with positive (covariant) quantification is of super-elementary complexity. The restriction is to limit the number of eigenvariables used in quantifier introductions rules to a reasonably usable level. This construction suggests that the known non-elementary decision algorithms for positive logic may actually be best possible
Physics Opportunities with the FCC-hh Injectors
In this chapter we explore a few examples of physics opportunities using the
existing chain of accelerators at CERN, including potential upgrades. In this
context the LHC ring is also considered as a part of the injector system. The
objective is to find examples that constitute sensitive probes of New Physics
that ideally cannot be done elsewhere or can be done significantly better at
theCERN accelerator complex. Some of these physics opportunities may require a
more flexible injector complex with additional functionality than that just
needed to inject protons into the FCC-hh at the right energy, intensity and
bunch structure. Therefore it is timely to discuss these options concurrently
with the conceptual design of the FCC-hh injector system.Comment: 13 pages, chapter 5 in Physics at the FCC-hh, a 100 TeV pp collide
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