The University Digital Library as a Center for Increasing the Digital Competences of Students

This paper aims to outline the advantages of increasing the quality of education at the University by describing some important organizational approaches and methodological guidelines for the development of digital competences among students. The study focuses on the level of digital (library) competencies among students and their need to use scientific information sources in the University Library. A survey was conducted using the direct individual inquiry method through a pre-designed questionnaire comprising 20 questions. The statistical apparatus includes statistical methods - frequency, mean value and confidence level – 95 %. The survey results suggest that in today's digital society it is particularly important for the Library to become an information-communicative center for improving the students' skills by using the rich collection of information and digital resources and increasing the quality of education and training at the University. The presented study seeks to offer new approaches and ways to motivate students toward effective use of digital information and of new tools for working in the digital environment

Suppression of Excited States Relative to the Ground State in Pb-Pb Collisions at s NN=5.02 TeV

© 2018 CERN. The relative yields of mesons produced in pp and Pb-Pb collisions at sNN=5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, (2S) and (3S), to the ground state, (1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [(nS)/(1S)]Pb-Pb/[(nS)/(1S)]pp, are measured to be 0.308±0.055(stat)±0.019(syst) for the (2S) and less than 0.26 at 95% confidence level for the (3S). No significant (3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as transverse momentum and rapidity. No significant dependencies are observed.BMWFW and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RPF (Cyprus); SENESCYT (Ecuador); MoER, ERC IUT, and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); LAS (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS, RFBR and RAEP (Russia); MESTD (Serbia); SEIDI, CPAN, PCTI and FEDER (Spain); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR, and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA)

Measurement of the top quark mass in the dileptonic ttˉt\bar{t} decay channel using the mass observables Mbl,MT2,M_{bl}, M_{T2}, and MblvM_{blv} in pppp collisions at s=8\sqrt{s} = 8 TeV

A measurement of the top quark mass ($M_{t}$) in the dileptonic ttbar decay channel is performed using data from proton-proton collisions at a center-of-mass energy of 8 TeV. The data was recorded by the CMS experiment at the LHC and corresponding to an integrated luminosity of 19.7$\pm$ 0.5$^{-1}$. Events are selected with two oppositely charged leptons $(\ell = e, \mu)$ and two jets identified as originating from b quarks. The analysis is based on three kinematic observables whose distributions are sensitive to the value of $M_{t}$. An invariant mass observable, $M_{bl}$, and a 'stransverse mass' observable, $M_{T2}$, are employed in a simultaneous fit to determine the value of $M_{t}$ and an overall jet energy scale factor (JSF). A complementary approach is used to construct an invariant mass observable, $M_{bl\nu},$ that is combined with $M_{T2}$ to measure $M_{t}$. The shapes of the observables, along with their evolutions in $M_{t}$ and JSF, are modeled by a nonparametric Gaussian process regression technique. The sensitivity of the observables to the value of $M_{t}$ is investigated using a Fisher information density method. The top quark mass is measured to be 172.22 $\pm$ 0.18 (stat)$^{+0.89}_{-0.93}$ (syst) GeV