Z → ττ production at CMS

The first measurement of the Z → ττ cross-section reconstructing hadronic and leptonic tau final states is presented. The data collected in 2010 with the CMS detector (CMS Collaboration, JINST 3 (2008) S08004) from p-p collisions at √s = 7TeV, corresponding to an integrated luminosity of about 36 pb−1, are used. The cross section has been measured to be in good agreement with the next-to-next-to-leading order electroweak prediction. The production of Z bosons decaying into tau pairs serves as an important benchmark for tau reconstruction and constitutes a reference Standard Model process for searches at the LHC, like the Minimal Supersymmetric Standard Model H → ττ

Search for the standard model Higgs boson in associated WH production in the eμτ and μμτ final states

A search for WH events has been performed by using data collected in 2011 at CMS corresponding to 4.7 fb−1. No signal is found and therefore upper limits are given in the Higgs mass range [100, 140] GeV/c2

Limiting Behaviour of the Mean Residual Life

In survival or reliability studies, the mean residual life or life expectancy is an important characteristic of the model. Here, we study the limiting behaviour of the mean residual life, and derive an asymptotic expansion which can be used to obtain a good approximation for large values of the time variable. The asymptotic expansion is valid for a quite general class of failure rate distributions--perhaps the largest class that can be expected given that the terms depend only on the failure rate and its derivatives.Comment: 19 page

A study of gas contaminants and interaction with materials in RPC closed loop systems

Resistive Plate Counters (RPC) detectors at the Large Hadron Collider (LHC) experiments use gas recirculation systems to cope with large gas mixture volumes and costs. In this paper a long-term systematic study about gas purifiers, gas contaminants and detector performance is discussed. The study aims at measuring the lifetime of purifiers with unused and used cartridge material along with contaminants release in the gas system. During the data-taking the response of several RPC double-gap detectors was monitored in order to characterize the correlation between dark currents, filter status and gas contaminants

CMS endcap RPC gas gap production for upgrade

The CMS experiment will install a RE4 layer of 144 new Resistive Plate Chambers (RPCs) on the existing york YE3 at both endcap regions to trigger high momentum muons from the proton-proton interaction. In this paper, we present the detailed procedures used in the production of new RPC gas gaps adopted in the CMS upgrade. Quality assurance is enforced as ways to maintain the same quality of RPC gas gaps as the existing 432 endcap RPC chambers that have been operational since the beginning of the LHC operation

Performance of the Gas Gain Monitoring system of the CMS RPC muon detector and effective working point fine tuning

The Gas Gain Monitoring (GGM) system of the Resistive Plate Chamber (RPC) muon detector in the Compact Muon Solenoid (CMS) experiment provides fast and accurate determination of the stability in the working point conditions due to gas mixture changes in the closed loop recirculation system. In 2011 the GGM began to operate using a feedback algorithm to control the applied voltage, in order to keep the GGM response insensitive to environmental temperature and atmospheric pressure variations. Recent results are presented on the feedback method used and on alternative algorithms

Processing of semantic and grammatical gender in Spanish speakers with aphasia

Published online: 30 May 2021.Background: Previous studies have argued that there are two types of linguistic gender: grammatical gender, which is arbitrarily assigned to nouns, and semantic gender, which depends on the gender of the referent. Aim: We explore the hypothesis that these two types of gender entail distinct cognitive processes by investigating the performance of people with aphasia at the level of sentence processing. Methods and Procedure: Nine people with aphasia (seven with fluent aphasia) and a control group of thirteen age-matched healthy participants took part in a constrained completion choice task. The participants had to complete sentences in a way that made the last word gender congruent. The subjects of the sentences had either Semantic gender (enfermera, nurse; indicating the gender of the referent), Grammatical gender (silla, chair), or Opaque-Grammatical gender (tomate, tomato). Results: People with aphasia performed more poorly in all gender conditions than healthy controls. They also were less accurate in both the Grammatical and Opaque-Grammatical conditions than in the Semantic gender condition. Conclusion: We propose that because semantic gender provides more salient information, it is processed faster than grammatical gender.MC was supported by the postdoctoral Ramón y Cajal fellowship (RYC-2013-14013), Agencia Estatal de Investigación (AEI, National Research Agency), and Fondo Europeo de Desarrollo Regional (FEDER, European Regional Development Fund) under projects PSI2017-87784-R and RED2018- 102615-T

Role of combined DWIBS/3D-CE-T1w whole-body MRI in tumor staging: Comparison with PET-CT

Objectives: To assess the diagnostic performance of whole-body magnetic resonance imaging (WB-MRI) by diffusion-weighted whole-body imaging with background body signal suppression (DWIBS) in malignant tumor detection and the potential diagnostic advantages in generating fused DWIBS/3D-contrast enhanced T1w (3D-CE-T1w) images. Methods: 45 cancer patients underwent 18F-FDG PET-CT and WB-MRI for staging purpose. Fused DWIBS/3D-CE T1w images were generated off-line. 3D-CE-T1w, DWIBS images alone and fused with 3D-CE T1w were compared by two readers groups for detection of primary diseases and local/distant metastases. Diagnostic performance between the three WB-MRI data sets was assessed using receiver operating characteristic (ROC) curve analysis. Imaging exams and histopathological results were used as standard of references. Results: Areas under the ROC curves of DWIBS vs. 3D-CE-T1w vs. both sequences in fused fashion were 0.97, 0.978, and 1.00, respectively. The diagnostic performance in tumor detection of fused DWIBS/3DCE- T1w images were statistically superior to DWIBS (p < 0.001) and 3D-CE-T1w (p ≤ 0.002); while the difference between DWIBS and 3D-CE-T1w did not show statistical significance difference. Detection rates of malignancy did not differ between WB-MRI with DWIBS and 18F-FDG PET-CT. Conclusion: WB-MRI with DWIBS is to be considered as alternative tool to conventional whole-body methods for tumor staging and during follow-up in cancer patients

Construction and commissioning of a technological prototype of a high-granularity semi-digital hadronic calorimeter

A large prototype of 1.3m3 was designed and built as a demonstrator of the semi-digital hadronic calorimeter (SDHCAL) concept proposed for the future ILC experiments. The prototype is a sampling hadronic calorimeter of 48 units. Each unit is built of an active layer made of 1m2 Glass Resistive Plate Chamber(GRPC) detector placed inside a cassette whose walls are made of stainless steel. The cassette contains also the electronics used to read out the GRPC detector. The lateral granularity of the active layer is provided by the electronics pick-up pads of 1cm2 each. The cassettes are inserted into a self-supporting mechanical structure built also of stainless steel plates which, with the cassettes walls, play the role of the absorber. The prototype was designed to be very compact and important efforts were made to minimize the number of services cables to optimize the efficiency of the Particle Flow Algorithm techniques to be used in the future ILC experiments. The different components of the SDHCAL prototype were studied individually and strict criteria were applied for the final selection of these components. Basic calibration procedures were performed after the prototype assembling. The prototype is the first of a series of new-generation detectors equipped with a power-pulsing mode intended to reduce the power consumption of this highly granular detector. A dedicated acquisition system was developed to deal with the output of more than 440000 electronics channels in both trigger and triggerless modes. After its completion in 2011, the prototype was commissioned using cosmic rays and particles beams at CERN.Comment: 49 pages, 41 figure

Respostas fisiológicas de bovinos Nelore, Senepol x Nelore e Angus x Nelore submetidos a teste de tolerância ao calor. I

a cadeia produtiva pecuária brasileira tem vivenciado aumento na introdução de raças taurinas (adaptadas e não adaptadas) e no uso de cruzamento industrial, todavia, pouco se sabe sobre a adaptabilidade desses grupos genéticos e dos produtos de seus cruzamentos às condições brasileiras. Assim sendo, o objetivo neste estudo é avaliar as respostas fisiológicas relacionadas à adaptabilidade de bovinos Nelore (NE) e cruzados Angus x Nelore (TA) e Senepol x Nelore (SN) submetidos a um teste de tolerância ao calor. O estudo foi executado na Embrapa Pecuária Sudeste, em São Carlos, SP, utilizando 15 fêmeas de cada grupo genético, com aproximadamente 14 meses de idade. Os animais foram avaliados em dias quentes de verão, sendo realizadas medidas de temperatura retal, de freqüência respiratória e de taxa de sudação. Nos dias do teste, a média do índice de temperatura e umidade (ITU), às 13 horas, foi de 78,9. Os animais cruzados Angus x Nelore apresentaram maior freqüência respiratória que os animais dos outros grupos genéticos e alta taxa de sudação, não diferindo do grupo Nelore. Os animais do grupo Senepol x Nelore apresentaram valores de taxa de sudação inferiores ao dos outros dois grupos (P<0,05). Esses resultados mostram que os animais Senepol x Nelore foram mais eficientes para manter a homeostase corporal, apresentando menores valores de freqüência respiratória e de taxa de sudação. Todavia os três grupos genéticos apresentaram valores semelhantes de temperatura corporal no teste de tolerância ao calor