2,054 research outputs found

    On b- and tau-multiplicities per event in SUSY (mSUGRA) and instrumental implications

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    We investigate the probability to find a b or tau in SUSY production with the mSUGRA model. We find that in the entire parameter space the probability per event to find a b-jet of E_T^b > 50 GeV within CMS acceptance (eta < 2.4) is significant for all tan(beta), varying from a 10 % level to 90 % depending on the m_0, m_1/2 region. The probabilities per event to find a tau with the same kinematical cuts is also significant and it increases sharply with tan(beta). These findings point to the central role a microvertex device would play in case that SUSY (mSUGRA) is indeed realized in nature and found at the LHC. First investigations done in the context of the more general MSSM scenario confirm the findings based on mSUGRA.Comment: 19 pages, 13 figures, 3 table

    The CMS detector and physics at the LHC

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    We discuss the physics issues at the LHC, the CMS detector, one of the two general purpose detectors planned at the LHC, and the expected physics performance of LHC detectors in the search for SM and SUSY Higgs bosons, some SUSY particle searches and some possibilities in B and heavy ion physics

    Prouńćavanje H ‚Üí ZZ ‚Üí 4‚Ąď ¬Ī pomońáu cjelovite geant simulacije detektora CMS

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    We study the detection of H ‚Üí ZZ ‚Üí 4‚Ąď ¬Ī in the CMS detector at the nominal LHC energy ‚ąö s = 14 TeV and the possibility for an early detection at a reduced energy ‚ąö s = 10 TeV. A systematic study of the multi‚Äďlepton mass resolution is performed, including effects of internal and external radiation through detailed GEANT simulations. At ‚ąö s = 14 TeV, an integrated luminosity of 104 pb‚ąí1 allows exploration at a ‚Č• 5ŌÉ significance level a mass range from mH ‚Čą 2mZ up to mH ‚Čą 400 GeV. For 105 pb‚ąí1 , the mass reach is about 650 GeV. At ‚ąö s = 10 TeV, an integrated luminosity of 104 pb‚ąí1 does not provide a 5ŌÉ significance level for any value of Higgs mass, and 2 √ó 104 pb‚ąí1 alows one to explore a mass range from mH ‚Čą 2mZ to ‚Čą 350 GeV at ‚Č• 5ŌÉ level.Prouńćava se detekcija H ‚Üí ZZ ‚Üí 4‚Ąď ¬Ī procesa u detektoru CMS na nominalnoj energiji LHC ‚ąö s = 14 TeV i moguńánost ranijeg opaŇĺanja na manjoj energiji od 10 TeV. Studija ukljuńćuje instrumentalne efekte za elektrone i muone i njihov utjecaj na razluńćivanje viŇ°eleptonskih masa

    Prouńćavanje H ‚Üí ZZ ‚Üí 4‚Ąď ¬Ī pomońáu cjelovite geant simulacije detektora CMS

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    We study the detection of H ‚Üí ZZ ‚Üí 4‚Ąď ¬Ī in the CMS detector at the nominal LHC energy ‚ąö s = 14 TeV and the possibility for an early detection at a reduced energy ‚ąö s = 10 TeV. A systematic study of the multi‚Äďlepton mass resolution is performed, including effects of internal and external radiation through detailed GEANT simulations. At ‚ąö s = 14 TeV, an integrated luminosity of 104 pb‚ąí1 allows exploration at a ‚Č• 5ŌÉ significance level a mass range from mH ‚Čą 2mZ up to mH ‚Čą 400 GeV. For 105 pb‚ąí1 , the mass reach is about 650 GeV. At ‚ąö s = 10 TeV, an integrated luminosity of 104 pb‚ąí1 does not provide a 5ŌÉ significance level for any value of Higgs mass, and 2 √ó 104 pb‚ąí1 alows one to explore a mass range from mH ‚Čą 2mZ to ‚Čą 350 GeV at ‚Č• 5ŌÉ level.Prouńćava se detekcija H ‚Üí ZZ ‚Üí 4‚Ąď ¬Ī procesa u detektoru CMS na nominalnoj energiji LHC ‚ąö s = 14 TeV i moguńánost ranijeg opaŇĺanja na manjoj energiji od 10 TeV. Studija ukljuńćuje instrumentalne efekte za elektrone i muone i njihov utjecaj na razluńćivanje viŇ°eleptonskih masa

    Eksperiment CMS na LHC-u

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    We discuss the current status of the Large Hadron Collider (LHC) machine, the progress on the construction of the CMS detector and some expectations for physics studies and searches at the LHC.Opisujemo sadaŇ°nje stanje gradnje ubrzivańća LHC, napredak u gradnji detektora CMS i neka ońćekivanja fizińćkih istraŇĺivanja i traganja na LHC-

    Eksperiment CMS na LHC-u

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    We discuss the current status of the Large Hadron Collider (LHC) machine, the progress on the construction of the CMS detector and some expectations for physics studies and searches at the LHC.Opisujemo sadaŇ°nje stanje gradnje ubrzivańća LHC, napredak u gradnji detektora CMS i neka ońćekivanja fizińćkih istraŇĺivanja i traganja na LHC-

    Report of experience in the use of palate prosthesis

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    La disfunci√≥n velofar√≠ngea (DVF) es el resultado de un inadecuado funcionamiento de estructuras din√°micas que trabajan para controlar el mecanismo velofaringeo, (paladar blando, las paredes laterales y pared posterior de faringe) que separa las cavidades nasal y oral durante el habla. La DVF, causada por falta de tejidos se denomina insuficiencia velofar√≠ngea (IVF), y es un factor generador de problemas en el habla por defecto estruc-tural, que requiere tratamiento de manejo f√≠sico pudiendo ser este abordado desde la reparaci√≥n quir√ļrgica o con pr√≥tesis de paladar1, 2.La correcci√≥n de la IVF debe ser realizada por un equipo interdisciplinario3. M√©todo: se confeccionaron las correspondientes pr√≥tesis de paladar en cuatro pacientes adolescente/adultos seleccionados, sin posibilidades de reparaci√≥n quir√ļrgica del esf√≠nter velofar√≠ngeo. Se realiz√≥ seguimiento, control y terapia. Se analizaron los resultados obtenidos. Conclusiones: Los resultados positivos solo fueron observados claramente en los pacientes que realizaron su tratamiento fonoaudiol√≥gico espec√≠fico luego de la colocaci√≥n de su pr√≥tesis de paladar obturadora con bulbo.Velopharyngeal dysfunction (DVF) is the result of an inadequate functioning of dynamic structures who work to control the velopharyngeal mechanism (soft palate, lateral walls and posterior pharyngeal wall) that separates the nasal and oral cavities during speech. FVD, caused by lack of tissues, is called velopharyngeal insufficiency (IVF), and it is a factor that generates problems in speech due to a structural defect, which requires physical manage ment treatment, which can be approached from surgical repair or with palatal prosthesis1,2. The correction of the IVF must be carried out by an interdisciplinary team3. Method: the corresponding palate prostheses were made in four selected adolescent / adult patients, without the possibility of surgical repair of the velopharyngeal sphincter. Follow-up, control and therapy were carried out. The results obtained were analyzed. Conclusions: The positive results were only clearly observed in the patients who underwent their specific speech therapy treatment after the placement of their bulbous obturator palate prosthesis.Fil: Fern√°ndez Salto, Mar√≠a Laura . Universidad Nacional de Cuyo. Facultad de Odontolog√≠aFil: Denegri, Mar√≠a Alicia. Universidad Nacional de Cuyo. Facultad de Odontolog√≠aFil: Monllor, Mar√≠a Laura. Mendoza. Ministerio de SaludFil: Gonz√°lez Marotta, Alejandra. Mendoza. Ministerio de SaludFil: D√≠az, Daniel. Universidad Nacional de Cuyo. Facultad de Odontolog√≠aFil: Aferri, Homero Carneiro. Universidade de S√£o Paulo (Brasil)Fil: Dutka, Jeniffer de C√°ssia Rillo. Universidade de S√£o Paulo (Brasil

    Performance of the CMS Cathode Strip Chambers with Cosmic Rays

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    The Cathode Strip Chambers (CSCs) constitute the primary muon tracking device in the CMS endcaps. Their performance has been evaluated using data taken during a cosmic ray run in fall 2008. Measured noise levels are low, with the number of noisy channels well below 1%. Coordinate resolution was measured for all types of chambers, and fall in the range 47 microns to 243 microns. The efficiencies for local charged track triggers, for hit and for segments reconstruction were measured, and are above 99%. The timing resolution per layer is approximately 5 ns

    Search for supersymmetry in events with b-quark jets and missing transverse energy in pp collisions at 7 TeV