Measurement of pp inelastic cross section at √s = 7TeV at LHC

pp interactions can be cathegorized, according to their final state, as elastic, diffractive inelastic and inelastic. If the mass of the final state is small (Mx < 15 GeV) the event escapes undetected. Both CMS and ATLAS measured the total inelastic cross section for Mx greater than 15.7GeV with good precision and then extrapolated it to the full mass range using Monte Carlo models. The results of the total inelastic pp cross section at √s = 7TeV and the extrapolated value are here presented for both experiments. The ATLAS measurement of the inelastic cross section as a function of the rapidity gap, used to tune the MC simulations in the low mass region, is also presented

Una familia Veneta del libro de Marco Polo

Edición critica del manuscrito optimo de una rama veneta poliana. La edición va precedida de una introducción filológica e histórica y acompañada por una nota critica a modo de apéndice se editan los restantes componentes de esta subfamilia venet

Una familia Veneta del libro de Marco Polo

Tesis de la Universidad Complutense de Madrid, Facultad de Filología, Departamento de Filología Italiana, leída el 16-01-1991Edición critica del manuscrito optimo de una rama veneta poliana. La edición va precedida de una introducción filológica e histórica y acompañada por una nota critica a modo de apéndice se editan los restantes componentes de esta subfamilia venetaDepto. de Estudios Románicos, Franceses, Italianos y TraducciónFac. de FilologíaTRUEpu

The Role of XBRL on EMAS Reporting: An Analysis of Organisational Values Compatibility

This paper proposes a measurement method for assessing the extent to which the XBRL digital standard eXtensible Business Reporting Language can assist firms in implementing their reporting when applying EMAS The EU Eco-Management and Audit Scheme. A specific survey based on the work of (Bunker et al., 2007), which uses Value Compatibility, was carried out at the most important firms in Southern Spain. Different sectors were involved in the study: public hospital, copper manufacturing facilities, petrochemical plant and pulp and renewable energy production. The results reveal some concordances between EMAS using XBRL as a reporting technology, and the cultural, organisational and technical working environment of the analysed firms, specifically those related to the Structural Dimension. By contrast, some discordance is highlighted related to the Practical Dimension. The paper proposes for the first time the application of the global financial standard XBRL for a non financial purpose like the widely accepted EMAS, to actual potential uses in real scenarios. The empirical research combined heavy industry with services, privately owned firms with public entities, private and public sector, in the analysis of this technology. The paper represents a necessary landmark for a subsequent longitudinal study.JEL Codes - D8; M14; M15; M41; M4

Instagram: Balancing Information Asymmetry of the Tourism Industry

This study focuses on the use of Instagram by tourism companies. Specifically, it aims to analyze how Instagram empowers individuals over corporations in the digital dialogue, thus balancing the information asymmetry between corporations and stakeholders. Four categories of metrics have been collected to analyze the use of Instagram by companies: presence, impact, conversation, and influence. Additionally, OLS regressions have been performed to identify potential explanatory factors to explain the different behavior of each firm and its corresponding communities. While the use of Instagram by the selected firms is still scarce, significant results are as follows: corporations are using Instagram as an additional channel in their current communication; some explanatory factors account for significant differences in countries, size, and industries; and users are somehow reactive to the stream of pictures and texts disclosed by firms. The presence and impact of companies on Instagram are a highly important source for driving stakeholders’ conversation within the digital arena

Risk Disclosures and Non-Financial Reporting: Evidence in a New European Context

The objective of this research is to determine the extent and current characteristics of risk disclosure in Europe in the context of corporate non-financial reporting practices. A multivariate linear regression analysis on risk disclosure behaviour is performed on a sample of companies included in the EURO STOXX 50 Index, whose data were collected from their annual financial reports. Additionally, a first longitudinal exploration is carried out with respect to the GRI standard. It was possible to detect which risk items are more frequently reported by the selected corporations, and which corporate documents are most likely to contain relevant risk information. It was also possible to establish a link between specific industries, countries and company financial profiles and levels of risk disclosure. This empirical research is particularly relevant in the current scenario where several events converge: the gradual evolution, since 2017, of the NFRD (Non-Financial Reporting Directive) to a new Corporate Sustainability Reporting Directive (CSRD); the subsequent legal requirements for 2020 and 2021 of the ESEF (European Single Electronic Format) to support the disclosure of annual corporate reports; the pandemic and the new war scenario in Europe. This empirical work provides novel insights into risk disclosure and non-financial information in a particular setting, i.e., pre- and post-pandemic Europe, against a backdrop of growing concern about a new war scenario

Evidence for the h_b(1P) meson in the decay Upsilon(3S) --> pi0 h_b(1P)

Using a sample of 122 million Upsilon(3S) events recorded with the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we search for the $h_b(1P)$ spin-singlet partner of the P-wave chi_{bJ}(1P) states in the sequential decay Upsilon(3S) --> pi0 h_b(1P), h_b(1P) --> gamma eta_b(1S). We observe an excess of events above background in the distribution of the recoil mass against the pi0 at mass 9902 +/- 4(stat.) +/- 2(syst.) MeV/c^2. The width of the observed signal is consistent with experimental resolution, and its significance is 3.1sigma, including systematic uncertainties. We obtain the value (4.3 +/- 1.1(stat.) +/- 0.9(syst.)) x 10^{-4} for the product branching fraction BF(Upsilon(3S)-->pi0 h_b) x BF(h_b-->gamma eta_b).Comment: 8 pages, 4 postscript figures, submitted to Phys. Rev. D (Rapid Communications

Jet energy measurement with the ATLAS detector in proton-proton collisions at root s=7 TeV

The jet energy scale and its systematic uncertainty are determined for jets measured with the ATLAS detector at the LHC in proton-proton collision data at a centre-of-mass energy of √s = 7TeV corresponding to an integrated luminosity of 38 pb-1. Jets are reconstructed with the anti-kt algorithm with distance parameters R=0. 4 or R=0. 6. Jet energy and angle corrections are determined from Monte Carlo simulations to calibrate jets with transverse momenta pT≥20 GeV and pseudorapidities {pipe}η{pipe}<4. 5. The jet energy systematic uncertainty is estimated using the single isolated hadron response measured in situ and in test-beams, exploiting the transverse momentum balance between central and forward jets in events with dijet topologies and studying systematic variations in Monte Carlo simulations. The jet energy uncertainty is less than 2. 5 % in the central calorimeter region ({pipe}η{pipe}<0. 8) for jets with 60≤pT<800 GeV, and is maximally 14 % for pT<30 GeV in the most forward region 3. 2≤{pipe}η{pipe}<4. 5. The jet energy is validated for jet transverse momenta up to 1 TeV to the level of a few percent using several in situ techniques by comparing a well-known reference such as the recoiling photon pT, the sum of the transverse momenta of tracks associated to the jet, or a system of low-pT jets recoiling against a high-pT jet. More sophisticated jet calibration schemes are presented based on calorimeter cell energy density weighting or hadronic properties of jets, aiming for an improved jet energy resolution and a reduced flavour dependence of the jet response. The systematic uncertainty of the jet energy determined from a combination of in situ techniques is consistent with the one derived from single hadron response measurements over a wide kinematic range. The nominal corrections and uncertainties are derived for isolated jets in an inclusive sample of high-pT jets. Special cases such as event topologies with close-by jets, or selections of samples with an enhanced content of jets originating from light quarks, heavy quarks or gluons are also discussed and the corresponding uncertainties are determined. © 2013 CERN for the benefit of the ATLAS collaboration

Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

The inclusive and dijet production cross-sections have been measured for jets containing b-hadrons (b-jets) in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV, using the ATLAS detector at the LHC. The measurements use data corresponding to an integrated luminosity of 34 pb^-1. The b-jets are identified using either a lifetime-based method, where secondary decay vertices of b-hadrons in jets are reconstructed using information from the tracking detectors, or a muon-based method where the presence of a muon is used to identify semileptonic decays of b-hadrons inside jets. The inclusive b-jet cross-section is measured as a function of transverse momentum in the range 20 < pT < 400 GeV and rapidity in the range |y| < 2.1. The bbbar-dijet cross-section is measured as a function of the dijet invariant mass in the range 110 < m_jj < 760 GeV, the azimuthal angle difference between the two jets and the angular variable chi in two dijet mass regions. The results are compared with next-to-leading-order QCD predictions. Good agreement is observed between the measured cross-sections and the predictions obtained using POWHEG + Pythia. MC@NLO + Herwig shows good agreement with the measured bbbar-dijet cross-section. However, it does not reproduce the measured inclusive cross-section well, particularly for central b-jets with large transverse momenta.Comment: 10 pages plus author list (21 pages total), 8 figures, 1 table, final version published in European Physical Journal

Measurement of the cross-section and charge asymmetry of WW bosons produced in proton-proton collisions at s=8\sqrt{s}=8 TeV with the ATLAS detector

This paper presents measurements of the $W^+ \rightarrow \mu^+\nu$ and $W^- \rightarrow \mu^-\nu$ cross-sections and the associated charge asymmetry as a function of the absolute pseudorapidity of the decay muon. The data were collected in proton--proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS experiment at the LHC and correspond to a total integrated luminosity of 20.2~\mbox{fb^{-1}}. The precision of the cross-section measurements varies between 0.8% to 1.5% as a function of the pseudorapidity, excluding the 1.9% uncertainty on the integrated luminosity. The charge asymmetry is measured with an uncertainty between 0.002 and 0.003. The results are compared with predictions based on next-to-next-to-leading-order calculations with various parton distribution functions and have the sensitivity to discriminate between them.Comment: 38 pages in total, author list starting page 22, 5 figures, 4 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-13