140 research outputs found
Motion of CMS detector and mechanical structures during Magnet Cycles and Stability Periods from 2008 to 2013 as observed by the Link Alignment System
Magnet Cycles and Stability Periods of the CMS Experiment are studied with the Alignment Link System data recorded along the 2008-2013 years of operation. The motions of the mechanical structures due to the magnetic field forces are studied and the mechanical stability of the detector during the physics data taking periods is verified.Peer Reviewe
Encapsulation of Lactobacillus plantarum in casein-chitosan microparticles facilitates the arrival to the colon and develops an immunomodulatory effect
The current work describes the capability of casein-chitosan microparticles to encapsulate Lactobacillus plantarum
(CECT 220 and WCFS1 strains) and evaluates their ability to target the distal areas of the gut and to stimulate the
immune system. Microparticles were prepared by complex coacervation, between sodium caseinate and chitosan
in an aqueous suspension of the bacteria, and dried by spray-drying. In order to increase the survival rate of the
loaded bacteria, microparticles were cross-linked with one of the following cross-linkers: tripolyphosphate,
calcium salts or vanillin.
Overall, microparticles displayed a mean size of about 7.5 μm with a bacteria loading of about 11 Log CFU/g,
when cross-linked with vanillin (MP-LP-V). For conventional microparticles, the payload was 10.12 Log CFU/g.
The storage stability study at 25 ◦C/60% RH, MP-LP-V offered the highest degree of protection without signif-
icant modification of the payload in 260 days. Compared with control (aqueous suspension of bacteria), MP-LP-V
also displayed a significantly higher degree of protection against probiotic inactivation in simulated gastric and
intestinal fluids. In vivo results evidenced that microparticles, orally administered to rats, were able to reach the
distal ileum and colon in about 4 h post-administration. Additionally, the effect of the daily administration of
107 CFU/mouse of MP-LP-V, for 3 weeks, induced an immunomodulatory effect characterized by an important
enhancement of Th1 and Th17 responses. In conclusion, these microparticles seem to be a promising strategy for
increasing survival and efficacy of probiotics, allowing the formulation of cost-effective and more stable and
effective probiotic-based nutraceuticals
Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at √s = 8 TeV
et al.A description is provided of the performance of the CMS detector for photon reconstruction and identification in proton-proton collisions at a centre-of-mass energy of 8 TeV at the CERN LHC. Details are given on the reconstruction of photons from energy deposits in the electromagnetic calorimeter (ECAL) and the extraction of photon energy estimates. The reconstruction of electron tracks from photons that convert to electrons in the CMS tracker is also described, as is the optimization of the photon energy reconstruction and its accurate modelling in simulation, in the analysis of the Higgs boson decay into two photons. In the barrel section of the ECAL, an energy resolution of about 1% is achieved for unconverted or late-converting photons from H→γγ decays. Different photon identification methods are discussed and their corresponding selection efficiencies in data are compared with those found in simulated events.Individuals have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation a la Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS programme of Foundation for Polish Science, cofinanced from European Union, Regional Development Fund; the Compagnia di San Paolo (Torino); the Consorzio per la Fisica (Trieste); MIUR project 20108T4XTM (Italy); the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF; and the National Priorities Research Program by Qatar National Research Fund.Peer Reviewe
Measurements of jet multiplicity and differential production cross sections of Z + jets events in proton-proton collisions at √s = 7 TeV
et al.Measurements of differential cross sections are presented for the production of a Z boson and at least one hadronic jet in proton-proton collisions at √s=7 TeV, recorded by the CMS detector, using a data sample corresponding to an integrated luminosity of 4.9 fb−1. The jet multiplicity distribution is measured for up to six jets. The differential cross sections are measured as a function of jet transverse momentum and pseudorapidity for the four highest transverse momentum jets. The distribution of the scalar sum of jet transverse momenta is also measured as a function of the jet multiplicity. The measurements are compared with theoretical predictions at leading and next-to-leading order in perturbative QCD.Individuals have received support from the Marie Curie program and the European
Research Council and EPLANET (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal
Science Policy Office; the Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIABelgium); the Agentschap voor Innovatie door Wetenschap
en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMINGPLUS program of Foundation for Polish Science, cofinanced by the European Union, Regional Development Fund; the Compagnia di San Paolo (Torino); the Consorzio per la Fisica (Trieste); MIUR Grant No. 20108T4XTM (Italy); the Thalis and Aristeia programs cofinanced by EU-ESF and the Greek NSRF; and the National Priorities Research Program by Qatar National Research Fund.Peer Reviewe
Differential cross section measurements for the production of a W boson in association with jets in proton–proton collisions at √s = 7 TeV
Open Access funded by SCOAP³ - Sponsoring Consortium for Open Access Publishing in Particle Physics.-- et al.Measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse momenta (pT) and pseudorapidities of the four leading jets, the scalar sum of jet transverse momenta (HT), and the difference in azimuthal angle between the directions of each jet and the muon. The data sample of pp collisions at a centre-of-mass energy of 7 TeV was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of 5.0 fb-1. The measured cross sections are compared to predictions from Monte Carlo generators, MadGraph+pythia and sherpa, and to next-to-leading-order calculations from BlackHat+sherpa. The differential cross sections are found to be in agreement with the predictions, apart from the pT distributions of the leading jets at high pT values, the distributions of the HT at high-HT and low jet multiplicity, and the distribution of the difference in azimuthal angle between the leading jet and the muon at low values.Individuals have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A.P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal
Science Policy Office; the Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWTBelgium); the Ministry of Education, Youth and Sports (MEYS) of
the Czech Republic; the Council of Scientific and Industrial Research,
India; the HOMING PLUS programme of Foundation For Polish Science, cofinanced from European Union, Regional Development Fund; the Compagnia di San Paolo (Torino); the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF; and the National Priorities Research Program by Qatar National Research
Fund.Funded by SCOAP3.Peer Reviewe
Search for new resonances decaying via WZ to leptons in proton-proton collisions at √s=8TeV
Open Access funded by SCOAP³ - Sponsoring Consortium for Open Access Publishing in Particle Physics.-- et al.A search is performed in proton-proton collisions at √s=8 TeV for exotic particles decaying via WZ to fully leptonic final states with electrons, muons, and neutrinos. The data set corresponds to an integrated luminosity of 19.5 fb-1. No significant excess is observed above the expected standard model background. Upper bounds at 95% confidence level are set on the production cross section of a W' boson as predicted by an extended gauge model, and on the W'WZ coupling. The expected and observed mass limits for a W' boson, as predicted by this model, are 1.55 and 1.47 TeV, respectively. Stringent limits are also set in the context of low-scale technicolor models under a range of assumptions for the model parameters.Individuals have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union); the Leventis Foundation; the Alfred P. Sloan Foundation; the Alexander von Humboldt-Stiftung; the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWTBelgium); the Ministry of Education, Youth and Sports (MEYS) of
the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS programme of Foundation For Polish Science, cofinanced from European Union, Regional Development Fund; the Compagnia di San Paolo (Torino); the Consorzio per la
Fisica (Trieste); MIUR project 20108T4XTM (Italy); the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF; and the National Priorities Research Program by Qatar National Research Fund.Funded by SCOAP3.Peer Reviewe
Measurements of inclusive W and Z cross sections in pp collisions at ps = 7 TeV
40 páginas, 8 figuras, 5 tablas.-- Open Access: This article is distributed under the terms of the Creative Commons
Attribution Noncommercial License.-- CMS Collaboration: et al.Measurements of inclusive W and Z boson production cross sections in pp
collisions at ps = 7 TeV are presented, based on 2:9 pb1 of data recorded by the CMS
detector at the LHC. The measurements, performed in the electron and muon decay channels,
are combined to give (pp ! WX) B(W ! ` ) = 9:95 0:07 (stat.) 0:28 (syst.)
1:09 (lumi.) nb and (pp ! ZX) B(Z ! `+`) = 0:931 0:026 (stat.) 0:023 (syst.)
0:102 (lumi.) nb, where ` stands for either e or . Theoretical predictions, calculated at
the next-to-next-to-leading order in QCD using recent parton distribution functions, are
in agreement with the measured cross sections. Ratios of cross sections, which incur an
experimental systematic uncertainty of less than 4%, are also reported.This work was supported by the Austrian Federal
Ministry of Science and Research; the Belgium Fonds de la Recherche Scienti que, and
Fonds voor Wetenschappelijk Onderzoek; the Brazilian Funding Agencies (CNPq, CAPES,
FAPERJ, and FAPESP); the Bulgarian Ministry of Education and Science; CERN; the Chinese
Academy of Sciences, Ministry of Science and Technology, and National Natural Science
Foundation of China; the Colombian Funding Agency (COLCIENCIAS); the Croatian
Ministry of Science, Education and Sport; the Research Promotion Foundation, Cyprus;
the Estonian Academy of Sciences and NICPB; the Academy of Finland, Finnish Ministry
of Education, and Helsinki Institute of Physics; the Institut National de Physique Nucléaire
et de Physique des Particules / CNRS, and Commissariat a l'Énergie Atomique, France;
the Bundesministerium für Bildung und Forschung, Deutsche Forschungsgemeinschaft, and
Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germa-ny; the General Secretariat
for Research and Technology, Greece; the National Scienti c Research Foundation, and
National O ce for Research and Technology, Hungary; the Department of Atomic Energy,
and Department of Science and Technology, India; the Institute for Studies in Theoretical
Physics and Mathematics, Iran; the Science Foundation, Ireland; the Istituto Nazionale di
Fisica Nucleare, Italy; the Korean Ministry of Education, Science and Technology and the
World Class University program of NRF, Korea; the Lithuanian Academy of Sciences; the
Mexican Funding Agencies (CINVESTAV, CONACYT, SEP, and UASLP-FAI); the Pakistan
Atomic Energy Commission; the State Commission for Scienti c Research, Poland;
the Fundaçâo para a Ciência e a Tecnologia, Portugal; JINR (Armenia, Belarus, Georgia,
Ukraine, Uzbekistan); the Ministry of Science and Technologies of the Russian Federation,
and Russian Ministry of Atomic Energy; the Ministry of Science and Technological
Development of Serbia; the Ministerio de Ciencia e Innovación, and Programa Consolider-
Ingenio 2010, Spain; the Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF,
UniZH, Canton Zurich, and SER); the National Science Council, Taipei; the Scienti c and
Technical Research Council of Turkey, and Turkish Atomic Energy Authority; the Science
and Technology Facilities Council, U.K.; the US Department of Energy, and the US
National Science Foundation.
Individuals have received support from the Marie-Curie programme and the European
Research Council (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Associazione per lo Sviluppo Scienti co e
Tecnologico del Piemonte (Italy); the Belgian Federal Science Policy Office; the Fonds pour
la Formation à la Recherche dans l'Industrie et dans l'Ágriculture (FRIA-Belgium); and
the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium).Peer reviewe
Search for a low-mass τ−τ+ resonance in association with a bottom quark in proton-proton collisions at √s = 13 TeV
A general search is presented for a low-mass ττ resonance produced in association with a bottom quark. The search is based on proton-proton collision data at a center-of-mass energy of 13 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb. The data are consistent with the standard model expectation. Upper limits at 95% confidence level on the cross section times branching fraction are determined for two signal models: a light pseudoscalar Higgs boson decaying to a pair of τ leptons produced in association with bottom quarks, and a low-mass boson X decaying to a τ-lepton pair that is produced in the decay of a bottom-like quark B such that B → bX. Masses between 25 and 70 GeV are probed for the light pseudoscalar boson with upper limits ranging from 250 to 44 pb. Upper limits from 20 to 0.3 pb are set on B masses between 170 and 450 GeV for X boson masses between 20 and 70 GeV.[Figure not available: see fulltext.].Individuals have received support from the Marie-Curie program and the European Research Council and Horizon 2020 Grant, contract Nos. 675440 and 765710 (European Union); the Programa Estatal de Fomento de la Investigacion Cientifica y Tecnica de Excelencia Maria de Maeztu, grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias
Measurement of the differential Drell-Yan cross section in proton-proton collisions at √s = 13 TeV
The CMS collaboration: et al.Measurements of the differential cross section for the Drell-Yan process, based on proton-proton collision data at a centre-of-mass energy of 13 TeV, collected by the CMS experiment, are presented. The data correspond to an integrated luminosity of 2.8 (2.3) fb-1 in the dimuon (dielectron) channel. The total and fiducial cross section measurements are presented as a function of dilepton invariant mass in the range 15 to 3000 GeV, and compared with the perturbative predictions of the standard model. The measured differential cross sections are in good agreement with the theoretical calculations. [Figure not available: see fulltext.].Individuals have received support from the Marie-Curie programme and the European Research Council and Horizon 2020 Grant, contract No. 675440 (European Union); the Programa Estatal de Fomento de la Investigacion Cientifica y Tecnica de Excelencia Maria de Maeztu, grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias
Search for a heavy pseudoscalar boson decaying to a Z and a Higgs boson at √s = 13TeV
CMS Collaboration: et al.A search is presented for a heavy pseudoscalar boson A decaying to a Z boson and a Higgs boson with mass of 125GeV. In the final state considered, the Higgs boson decays to a bottom quark and antiquark, and the Z boson decays either into a pair of electrons, muons, or neutrinos. The analysis is performed using a data sample corresponding to an integrated luminosity of 35.9fb−1 collected in 2016 by the CMS experiment at the LHC from proton–proton collisions at a center-of-mass energy of 13TeV. The data are found to be consistent with the background expectations. Exclusion limits are set in the context of two-Higgs-doublet models in the A boson mass range between 225 and 1000GeV.Individuals have received support from the Marie-Curie program and the European Research Council and Horizon 2020 Grant, contract No. 675440 (European Union); the Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia María de Maeztu, Grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias
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