787 research outputs found

    Hidden Valley searches at CLIC

    Full text link
    The sensitivity studies to observe long-lived particles predicted by a set of beyond the Standard Model theoretical models are reported. The analysis is based on a data sample of e+e−e^+e^- collisions at sqrt(s) = 3 TeV, simulated with the CLIC_ILD detector model and corresponding to an integrated luminosity of 3 ab-1. Long-lived particle decay products are subsequently combined to reconstruct the parent bosons employing secondary vertices displaced from the beam axis. The upper limits on the production cross section for the long-lived particle lifetimes from 1 to 300 ps, masses between 25 and 50 GeV/c2, and a parent Higgs mass of 126 GeV/c2 are determined.Comment: Talk presented at the International Workshop on Future Linear Colliders (LCWS2018), Arlington, Texas, 22-26 October 2018. C18-10-2

    Track Finding with Deep Neural Networks

    Get PDF
    High Energy Physics experiments require fast and efficient methods toreconstruct the tracks of charged particles. Commonly used algorithms aresequential and the CPU required increases rapidly with a number of tracks.Neural networks can speed up the process due to their capability to modelcomplex non-linear data dependencies and finding all tracks in parallel.In this paper we describe the application of the Deep Neural Networkto the reconstruction of straight tracks in a toy two-dimensional model. It isplanned to apply this method to the experimental data taken by the MUonEexperiment at CERN

    The analysis of suburban housing features based on the example of development investments realised in the vicinity of Krakow

    Get PDF
    Krakow, as many other developing metropolitan areas, undergoes dynamic suburban processes. Underinvested areas located in direct range of influence of large scale urban centers are becoming a scene of spontaneous city-creating processes. The paper presents results of analyses of new building complexes in the Krakow suburbia. Studies have proved weak spatial relation between particular investments, which may bear witness to an increasing role of network type relation in creating contemporary urban structures. Network type urban relations are not conducive to large-scale social structures in the way public spaces of streets and squares used to be in the traditional urban design. The “new order”, that is being shaped in suburban areas, seems to question some traditional social rules. Therefore the question of relation between these two: social and spatial dimensions of a city became up-to-date. Are new urban structures going to shape a new society, or maybe on the contrary – suburban neoplasm is a result of a contemporary civilization disease

    WpƂyw haƂasu drogowego na ptaki

    Get PDF
    The dynamic development of road infrastructure negatively influences the natural environment and animals using habitats near roads. The main negative effects of this process are primarily: loss and fragmentation of habitats. Another problem is an increase in pollutants and noise intensity in the vicinity of roads. An important problem is negative influence of traffic noise on animals and especially birds. Road noise generate by vehicles disturb vocal communication between birds, mainly in the time of pair formation and early incubation period. Difficulties in communication evoked by noise seem to be one of the main problems in functioning in noisy surroundings. The main functions of birds’ singing are related with territorial defence and mating a partner. Another important effect on birds’ functioning near roads results in the masking of important biological signals due to noise. Masking important signals for territorial defence or partner selection can have as a consequence a negative influence on reproductive success. Species of birds which emit low frequency sounds are particularly exposed to this negative impact. As a results of traffic noise the changes in the volume and frequency of emitted sounds during singing are observed. Some authors pay attention to such factors as local climate or habitat and vegetation structure, because they have an important influence on the propagation of traffic noise. Most of the studies carried out previously concerns the breeding season, and only a few works to describe the impact of noise on birds during migration or wintering. The most frequently reported problem for researchers is to assess the densities of breeding birds near the roadside. The majority of species react with a drop in numbers at roadsides. There are species which are also known to appear with higher density at roadsides. Usually this is related with a richer plant vegetation structure at roadsides and the appearance of the so-called “edge effect”. Some results indicate that bird density at forest peripheries can reach values 40% higher than in the deep forest. An explanation of causes for such a state of matters are the higher numbers of invertebrates found at forest edges. The important factor influencing bird populations breeding at roadsides is also nest predation. Noise and visual disturbance can modifying predator pressure near roads.Szybki rozwĂłj sieci drogowej oraz infrastruktury z nią związanej wywiera silną presję na ƛrodowisko oraz ĆŒywe organizmy, wykorzystujące siedliska zlokalizowane w pobliĆŒu drĂłg. Negatywne skutki tego procesu polegają na utracie i fragmentacji siedlisk uĆŒytkowanych przez zwierzęta. Osobnym zagadnieniem jest wzrost zanieczyszczeƄ powietrza i gleby w sąsiedztwie szlakĂłw komunikacyjnych. WaĆŒnym problemem jest oddziaƂywanie haƂasu na zwierzęta egzystujące w pobliĆŒu drĂłg, w tym szczegĂłlnie na ptaki. HaƂas generowany przez pojazdy zakƂóca komunikację dĆșwiękową ptakĂłw zwƂaszcza w okresie formowania się par i wczesnej inkubacji jaj. Zasadnicze funkcje ƛpiewu ptakĂłw to sygnalizacja rywalom wƂasnego gatunku zajęcia terytorium oraz co najwaĆŒniejsze przywabienie partnera. HaƂaƛliwe „tƂo” w sąsiedztwie drogi powoduje trudnoƛci w porozumiewaniu się osobnikĂłw. OgĂłlnie zjawisko zakƂócania komunikacji gƂosowej pomiędzy osobnikami przez haƂas drogowy, wywoƂuje tzw. „maskowanie” waĆŒnych sygnaƂów biologicznych. Najbardziej wraĆŒliwe na wpƂyw haƂasu drogowego okazują się gatunki wydające dĆșwięki o niskim paƛmie częstotliwoƛci ze względu na skutecznoƛć ich maskowania przez haƂas charakteryzujący się podobnym spektrum częstotliwoƛci. W efekcie dziaƂania haƂasu drogowego powstają zmiany w natÄ™ĆŒeniu a nawet częstotliwoƛci ƛpiewu ptakĂłw. NiektĂłrzy autorzy zwracają rĂłwnieĆŒ uwagę na modyfikujący wpƂyw czynnikĂłw klimatycznych oraz struktury i typu siedliska w rozprzestrzenianiu się haƂasu. Większoƛć wykonanych dotychczas badaƄ dotyczy okresu lęgowego, a tylko nieliczne prace zajmują się oddziaƂywaniem haƂasu na ptaki w okresie migracji lub w okresie zimowania. Najczęƛciej podejmowanym zagadnieniem przez badaczy jest ocena zagęszczeƄ lęgowych ptakĂłw przy drodze. W większoƛci badaƄ zaobserwowano spadek liczebnoƛci i bogactwa gatunkowego osobnikĂłw w sąsiedztwie szlakĂłw komunikacyjnych. Jednak niektĂłre gatunki ptakĂłw, ze względu na tzw. „efekt krawędzi”, ktĂłry modyfikuje zasobnoƛć bazy pokarmowej oraz mikroklimat, występują w większych zagęszczeniach wƂaƛnie przy drogach. WaĆŒnym zagadnieniem jest rĂłwnieĆŒ modyfikujący wpƂyw haƂasu na drapieĆŒnictwo przy drogach

    Czy stosujemy spersonalizowane leczenie raka pƂuca? Wykorzystanie badaƄ molekularnych w planowaniu wielu linii leczenia u chorego na gruczolakoraka pƂuca

    Get PDF
    W wielodyscyplinarnym podejƛciu do leczenia chorych na raka pƂuca coraz większą rolę odgrywają terapie ukierunkowane molekularnie, ktĂłre moĆŒna zastosować w genetycznie wyselekcjonowanej grupie chorych. Personalizacja leczenia zwiększa liczbę opcji terapeutycznych, wydƂuĆŒa przeĆŒycie chorych oraz zmniejsza ryzyko wystąpienia efektĂłw ubocznych terapii, mogących zagraĆŒać ĆŒyciu. W niniejszym opracowaniu przenalizowano proces leczenia 57-letniego mÄ™ĆŒczyzny chorego na gruczolakoraka pƂuca, u ktĂłrego wykryto mutację aktywującą w genie EGFR. OprĂłcz diagnostycznej segmentektomii oraz paliatywnej hemipelwektomii i radioterapii przerzutu do stawu biodrowego, a takĆŒe operacji cytoredukcyjnej guza pierwotnego, u chorego zastosowano szeƛć linii leczenia systemowego opartych zarĂłwno na nowoczesnych terapiach ukierunkowanych molekularnie i immunoterapeutykach, jak i standardowych cytostatykach, co pozwoliƂo uzyskać trzyletnie przeĆŒycie pacjenta. NiezaleĆŒnie od dobrego stanu ogĂłlnego i dobrej tolerancji leczenia uporczywoƛć kontynuowania terapii mimo braku dƂuĆŒszej stabilizacji choroby pozostaje dyskusyjna

    Les droits disciplinaires des fonctions publiques : « unification », « harmonisation » ou « distanciation ». A propos de la loi du 26 avril 2016 relative à la déontologie et aux droits et obligations des fonctionnaires

    Get PDF
    The production of tt‟ , W+bb‟ and W+cc‟ is studied in the forward region of proton–proton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98±0.02 fb−1 . The W bosons are reconstructed in the decays W→ℓΜ , where ℓ denotes muon or electron, while the b and c quarks are reconstructed as jets. All measured cross-sections are in agreement with next-to-leading-order Standard Model predictions.The production of tt‟t\overline{t}, W+bb‟W+b\overline{b} and W+cc‟W+c\overline{c} is studied in the forward region of proton-proton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98 ±\pm 0.02 \mbox{fb}^{-1}. The WW bosons are reconstructed in the decays W→ℓΜW\rightarrow\ell\nu, where ℓ\ell denotes muon or electron, while the bb and cc quarks are reconstructed as jets. All measured cross-sections are in agreement with next-to-leading-order Standard Model predictions

    A study of CP violation in B-+/- -> DK +/- and B-+/- -> D pi(+/-) decays with D -> (KSK +/-)-K-0 pi(-/+) final states

    Get PDF
    A first study of CP violation in the decay modes B±→[KS0K±π∓]Dh±B^\pm\to [K^0_{\rm S} K^\pm \pi^\mp]_D h^\pm and B±→[KS0K∓π±]Dh±B^\pm\to [K^0_{\rm S} K^\mp \pi^\pm]_D h^\pm, where hh labels a KK or π\pi meson and DD labels a D0D^0 or D‟0\overline{D}^0 meson, is performed. The analysis uses the LHCb data set collected in pppp collisions, corresponding to an integrated luminosity of 3 fb−1^{-1}. The analysis is sensitive to the CP-violating CKM phase Îł\gamma through seven observables: one charge asymmetry in each of the four modes and three ratios of the charge-integrated yields. The results are consistent with measurements of Îł\gamma using other decay modes

    Study of the rare B-s(0) and B-0 decays into the pi(+) pi(-) mu(+) mu(-) final state

    Get PDF
    A search for the rare decays Bs0→π+π−Ό+Ό−B_s^0 \to \pi^+\pi^-\mu^+\mu^- and B0→π+π−Ό+Ό−B^0 \to \pi^+\pi^-\mu^+\mu^- is performed in a data set corresponding to an integrated luminosity of 3.0 fb−1^{-1} collected by the LHCb detector in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. Decay candidates with pion pairs that have invariant mass in the range 0.5-1.3 GeV/c2c^2 and with muon pairs that do not originate from a resonance are considered. The first observation of the decay Bs0→π+π−Ό+Ό−B_s^0 \to \pi^+\pi^-\mu^+\mu^- and the first evidence of the decay B0→π+π−Ό+Ό−B^0 \to \pi^+\pi^-\mu^+\mu^- are obtained and the branching fractions are measured to be B(Bs0→π+π−Ό+Ό−)=(8.6±1.5 (stat)±0.7 (syst)±0.7 (norm))×10−8\mathcal{B}(B_s^0 \to \pi^+\pi^-\mu^+\mu^-)=(8.6\pm 1.5\,({\rm stat}) \pm 0.7\,({\rm syst})\pm 0.7\,({\rm norm}))\times 10^{-8} and B(B0→π+π−Ό+Ό−)=(2.11±0.51 (stat)±0.15 (syst)±0.16 (norm))×10−8\mathcal{B}(B^0 \to \pi^+\pi^-\mu^+\mu^-)=(2.11\pm 0.51\,({\rm stat}) \pm 0.15\,({\rm syst})\pm 0.16\,({\rm norm}) )\times 10^{-8}, where the third uncertainty is due to the branching fraction of the decay B0→J/ψ(→Ό+Ό−)K∗(890)0(→K+π−)B^0\to J/\psi(\to \mu^+\mu^-)K^*(890)^0(\to K^+\pi^-), used as a normalisation.A search for the rare decays Bs0→π+π−Ό+Ό− and B0→π+π−Ό+Ό− is performed in a data set corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb detector in proton–proton collisions at centre-of-mass energies of 7 and 8 TeV . Decay candidates with pion pairs that have invariant mass in the range 0.5–1.3 GeV/c2 and with muon pairs that do not originate from a resonance are considered. The first observation of the decay Bs0→π+π−Ό+Ό− and the first evidence of the decay B0→π+π−Ό+Ό− are obtained and the branching fractions, restricted to the dipion-mass range considered, are measured to be B(Bs0→π+π−Ό+Ό−)=(8.6±1.5 (stat)±0.7 (syst)±0.7(norm))×10−8 and B(B0→π+π−Ό+Ό−)=(2.11±0.51(stat)±0.15(syst)±0.16(norm))×10−8 , where the third uncertainty is due to the branching fraction of the decay B0→J/ψ(→Ό+Ό−)K⁎(892)0(→K+π−) , used as a normalisation.A search for the rare decays Bs0→π+π−Ό+Ό− and B0→π+π−Ό+Ό− is performed in a data set corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb detector in proton–proton collisions at centre-of-mass energies of 7 and 8 TeV . Decay candidates with pion pairs that have invariant mass in the range 0.5–1.3 GeV/c2 and with muon pairs that do not originate from a resonance are considered. The first observation of the decay Bs0→π+π−Ό+Ό− and the first evidence of the decay B0→π+π−Ό+Ό− are obtained and the branching fractions, restricted to the dipion-mass range considered, are measured to be B(Bs0→π+π−Ό+Ό−)=(8.6±1.5 (stat)±0.7 (syst)±0.7(norm))×10−8 and B(B0→π+π−Ό+Ό−)=(2.11±0.51(stat)±0.15(syst)±0.16(norm))×10−8 , where the third uncertainty is due to the branching fraction of the decay B0→J/ψ(→Ό+Ό−)K⁎(892)0(→K+π−) , used as a normalisation.A search for the rare decays Bs0→π+π−Ό+Ό−B_s^0 \to \pi^+\pi^-\mu^+\mu^- and B0→π+π−Ό+Ό−B^0 \to \pi^+\pi^-\mu^+\mu^- is performed in a data set corresponding to an integrated luminosity of 3.0 fb−1^{-1} collected by the LHCb detector in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. Decay candidates with pion pairs that have invariant mass in the range 0.5-1.3 GeV/c2c^2 and with muon pairs that do not originate from a resonance are considered. The first observation of the decay Bs0→π+π−Ό+Ό−B_s^0 \to \pi^+\pi^-\mu^+\mu^- and the first evidence of the decay B0→π+π−Ό+Ό−B^0 \to \pi^+\pi^-\mu^+\mu^- are obtained and the branching fractions, restricted to the dipion-mass range considered, are measured to be B(Bs0→π+π−Ό+Ό−)=(8.6±1.5 (stat)±0.7 (syst)±0.7 (norm))×10−8\mathcal{B}(B_s^0 \to \pi^+\pi^-\mu^+\mu^-)=(8.6\pm 1.5\,({\rm stat}) \pm 0.7\,({\rm syst})\pm 0.7\,({\rm norm}))\times 10^{-8} and B(B0→π+π−Ό+Ό−)=(2.11±0.51 (stat)±0.15 (syst)±0.16 (norm))×10−8\mathcal{B}(B^0 \to \pi^+\pi^-\mu^+\mu^-)=(2.11\pm 0.51\,({\rm stat}) \pm 0.15\,({\rm syst})\pm 0.16\,({\rm norm}) )\times 10^{-8}, where the third uncertainty is due to the branching fraction of the decay B0→J/ψ(→Ό+Ό−)K∗(890)0(→K+π−)B^0\to J/\psi(\to \mu^+\mu^-)K^*(890)^0(\to K^+\pi^-), used as a normalisation
    • 

    corecore