Search results for "CMS"
showing 10 items of 104 documents
Observation of e + e − → ηψ(2S) at center-of-mass energies from 4.236 to 4.600 GeV
2021
Journal of high energy physics 2021(10), 177 (2021). doi:10.1007/JHEP10(2021)177
Hydrological regime modifications induced by climate change in Mediterranean area
2015
The knowledge of river flow regimes has a capital importance for a variety of practical applications, in water resource management, including optimal and sustainable use. Hydrological regime is highly dependent on climatic factors, among which the most important is surely the precipitation, in terms of frequency, seasonal distribution and intensity of rainfall events. The streamflow frequency regime of river basins are often summarized by flow duration curves (FDCs), that offer a simple and comprehensive graphical view of the overall historical variability associated with streamflow, and characterize the ability of the basin to provide flows of various magnitudes. Climate change is likely t…
Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider
2020
Particles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at the weak scale. When produced at experiments such as the Large Hadron Collider (LHC) at CERN, these longlived particles (LLPs) can decay far from the interaction vertex of the primary proton–proton collision. Such LLP signatures are distinct from those of promptly decaying particles that are targeted by the majority of searches for new physics at the LHC, often requiring customized techniques to identify, for example, significantly displaced decay vertices, tracks with atypical properties, and short track segments. Given their non-standard nature, a comprehensive overview of LLP…
Soft-dielectron excess in proton-proton collisions at $\sqrt{s}$ = 13 TeV
2021
Physical review letters 127(4), 042302 (2021). doi:10.1103/PhysRevLett.127.042302
Search for the Lepton Flavor Violation Process J/ψ→eμ at BESIII
2013
We search for the lepton-flavor-violating decay of the $J/\psi$ into an electron and a muon using $(225.3\pm2.8)\times 10^{6}$ $J/\psi$ events collected with the BESIII detector at the BEPCII collider. Four candidate events are found in the signal region, consistent with background expectations. An upper limit on the branching fraction of $\mathcal{B}(J/\psi \to e\mu)< 1.5 \times 10^{-7}$ (90% C.L.) is obtained.
Svarcelšanas tīmekļa vietne
2015
Svarcelšanas tīmekļa vietne ir sistēma, kura sniedz tās lietotājiem iespēju iegūt dažāda veida informāciju, komentēt tajā esošos rakstus un, ja lietošanas laikā viņiem rodas idejas, ko papildināt saturiski, vai kā padarīt šo sistēmu vēl interesantāku, ir arī iespēja iesniegt ieteikumus sistēmas administratoriem. Sistēmu iespējams izmantot gan reģistrētiem, gan nereģistrētiem lietotājiem. Savukārt sistēmas administratoriem ir dotas pamata satura pārvaldības iespējas, lai nodrošinātu sistēmas darbību ievietojot saturu un veicot nepieciešamās darbības kārtības uzturēšanai. Sistēma veida tā, lai nepieciešamības gadījumā, ja mainītos tematika, varētu to izmantot arī citiem nolūkiem. Izstrāde vei…
Turnīru rezultātu reģistrācijas sistēma spēlei League of Legends
2019
Kvalifikācijas darba ietvaros ir izstrādāta turnīru rezultātu reģistrēšanas sistēma spēlei “League of Legends”, kas paredz iespēju reģistrēt spēles turnīru administratoriem informāciju par dažādiem turnīriem un to norises rezultātiem, kā arī dot iespēju pašiem turnīru dalībniekiem un citiem cilvēkiem sekot līdzi turnīru norisei. Konkrētā sistēma palīdzēs ne tikai vien visiem, kam interesē kāds turnīrs un tā iznākums, apskatīt svarīgākos turnīra aspektus, neatrodoties tieši paša turnīra norises vietā, bet vēl jo vairāk pašiem turnīru organizatoriem taupīt laiku un naudu, ērti un ātri reģistrējot nozīmīgākos turnīra datus sistēmā, netērējot tam nekādus papīra resursus, kas mēdz ātri kļūt neli…
Future Projection of precipitation changes in the Júcar and Segura River Basins (Iberian Peninsula) by CMIP5 GCMs Local Downscaling
2021
The basins of the Júcar and Segura rivers, on the Mediterranean coast of the Iberian Peninsula, present a special water problem and are of particular interest regarding climate change. These basins are very vulnerable to a possible scenario of decreasing water resources. Recent studies on historic rainfall since 1955 have indicated an ongoing loss of precipitation in their headwaters, especially in the case of the Júcar river. The aim of the present study is to perform climate projections for the precipitation variable for several future periods (2021–2040, 2051–2070, 2081–2100) and emission scenarios (RCPs 4.5, 8.5) within the Júcar and Segura River Basin authorities. For this purpose, a s…
Partial wave analysis of ψ(2S)→ppˉη
2013
Using a sample of 1.06 x 10(8) psi(2) events collected with the BESIII detector at BEPCII, the decay psi(2S) -> p (p) over bar eta is studied. A partial wave analysis determines that the intermediate state N(1535) with a mass of 1524 +/- 5(-4)(+10) MeV/c(2) and a width of 130(-24-10)(+27+57) MeV/c(2) is dominant in the decay; the product branching fraction is determined to be B(psi(2S) -> N(1535)(p) over bar x B(N(1535) -> p eta + c.c. = 5.2 +/- 0.3(-1.2)(+3.2)) x 10(-5). Furthermore, the branching fraction of psi(2S) -> p (p) over bar eta is measured to be (6.4 +/- 0.2 +/- 0.6) x 10(-5). Here, the first error is statistical and the second is systematic.
Search for events with large missing transverse momentum, jets, and at least two tau leptons in 7 TeV proton–proton collision data with the ATLAS det…
2012
A search for events with large missing transverse momentum, jets, and at least two tau leptons has been performed using 2 fb[superscript −1] of proton–proton collision data at √s = 7 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed and a 95% CL upper limit on the visible cross section for new phenomena is set, where the visible cross section is defined by the product of cross section, branching fraction, detector acceptance and event selection efficiency. A 95% CL lower limit of 32 TeV is set on the gauge-mediated supersymmetry breaking (GMSB) scale Λ independent of tan β. These limits provide the most s…