Measurement of the top quark mass using charged particles in pp collisions at root s=8 TeV

Peer reviewe

Measurement of the Splitting Function in &ITpp &ITand Pb-Pb Collisions at root&ITsNN&IT=5.02 TeV

Data from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions, but it is not known where in the shower evolution the modifications occur. The momentum ratio of the two leading partons, resolved as subjets, provides information about the parton shower evolution. This substructure observable, known as the splitting function, reflects the process of a parton splitting into two other partons and has been measured for jets with transverse momentum between 140 and 500 GeV, in pp and PbPb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair. In central PbPb collisions, the splitting function indicates a more unbalanced momentum ratio, compared to peripheral PbPb and pp collisions.. The measurements are compared to various predictions from event generators and analytical calculations.Peer reviewe

A multi-country test of brief reappraisal interventions on emotions during the COVID-19 pandemic.

The COVID-19 pandemic has increased negative emotions and decreased positive emotions globally. Left unchecked, these emotional changes might have a wide array of adverse impacts. To reduce negative emotions and increase positive emotions, we tested the effectiveness of reappraisal, an emotion-regulation strategy that modifies how one thinks about a situation. Participants from 87 countries and regions (n = 21,644) were randomly assigned to one of two brief reappraisal interventions (reconstrual or repurposing) or one of two control conditions (active or passive). Results revealed that both reappraisal interventions (vesus both control conditions) consistently reduced negative emotions and increased positive emotions across different measures. Reconstrual and repurposing interventions had similar effects. Importantly, planned exploratory analyses indicated that reappraisal interventions did not reduce intentions to practice preventive health behaviours. The findings demonstrate the viability of creating scalable, low-cost interventions for use around the world

Search for new phenomena in final states with two opposite-charge, same-flavor leptons, jets, and missing transverse momentum in pp collisions at √s=13 TeV

Search results are presented for physics beyond the standard model in final states with two opposite-charge, same-flavor leptons, jets, and missing transverse momentum. The data sample corresponds to an integrated luminosity of 35.9 fb−1 of proton-proton collisions at s√=13 TeV collected with the CMS detector at the LHC in 2016. The analysis uses the invariant mass of the lepton pair, searching for a kinematic edge or a resonant-like excess compatible with the Z boson mass. The search for a kinematic edge targets production of particles sensitive to the strong force, while the resonance search targets both strongly and electroweakly produced new physics. The observed yields are consistent with the expectations from the standard model, and the results are interpreted in the context of simplified models of supersymmetry. In a gauge mediated supersymmetry breaking (GMSB) model of gluino pair production with decay chains including Z bosons, gluino masses up to 1500–1770 GeV are excluded at the 95% confidence level depending on the lightest neutralino mass. In a model of electroweak chargino-neutralino production, chargino masses as high as 610 GeV are excluded when the lightest neutralino is massless. In GMSB models of electroweak neutralino-neutralino production, neutralino masses up to 500-650 GeV are excluded depending on the decay mode assumed. Finally, in a model with bottom squark pair production and decay chains resulting in a kinematic edge in the dilepton invariant mass distribution, bottom squark masses up to 980–1200 GeV are excluded depending on the mass of the next-to-lightest neutralino

Search for electroweak production of charginos and neutralinos in multilepton final states in proton-proton collisions at root s=13 TeV

Results are presented from a search for the direct electroweak production of charginos and neutralinos in signatures with either two or more leptons (electrons or muons) of the same electric charge, or with three or more leptons, which can include up to two hadronically decaying tau leptons. The results are based on a sample of protonproton collision data collected at p s = 13TeV, recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 fb1. The observed event yields are consistent with the expectations based on the standard model. The results are interpreted in simpli ed models of supersymmetry describing various scenarios for the production and decay of charginos and neutralinos. Depending on the model parameters chosen, mass values between 180GeV and 1150 GeV are excluded at 95% CL. These results signi cantly extend the parameter space probed for these particles in searches at the LHC. In addition, results are presented in a form suitable for alternative theoretical interpretations.Sponsoring Consortium for Open Access Publishing in Particle Physic

Inclusive Search for a Highly Boosted Higgs Boson Decaying to a Bottom Quark-Antiquark Pair

© 2018 CERN. An inclusive search for the standard model Higgs boson (H) produced with large transverse momentum (pT) and decaying to a bottom quark-antiquark pair (bb) is performed using a data set of pp collisions at s=13 TeV collected with the CMS experiment at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb-1. A highly Lorentz-boosted Higgs boson decaying to bb is reconstructed as a single, large radius jet, and it is identified using jet substructure and dedicated b tagging techniques. The method is validated with Z→bb decays. The Z→bb process is observed for the first time in the single-jet topology with a local significance of 5.1 standard deviations (5.8 expected). For a Higgs boson mass of 125 GeV, an excess of events above the expected background is observed (expected) with a local significance of 1.5 (0.7) standard deviations. The measured cross section times branching fraction for production via gluon fusion of H→bb with reconstructed pT > 450 GeV and in the pseudorapidity range -2.5 < η < 2.5 is 74±48(stat)-10+17(syst) fb, which is consistent within uncertainties with the standard model prediction

Diagnóstico molecular, citogenético y anatomohistopatológico del Síndrome Freemartin en hembras bovinas en Colombia

Freemartin syndrome is a intersexuality condition developed in many of the female calfs born from heterosexual multiple calvings (male female). This originates in the fetal development between 30 and 40 days of gestation with transplacental exchange of cells through vascular anastomosis, occurring 60XX/XY chimerism in various tissues, and consequent sterility. In this paper was took blood samples from 106 female calves born from a multiple heterosexual calving. DNA was extracted from leucocytes and searched the SRY gene amplification associated with the Y chromosome by PCR and reading in agarose gel. 90 of 106 samples (84.9%) was amplified the SRY gene, verifying the 60XX/XY chimerism, and 16 samples (15.1%) that did not amplify the gene. Cytogenetic analysis using lymphocytes cell cultures showed the presence of Y chromosome in samples positive for SRY and absence of chimerism in SRY negative samples. The postmortem analysis of female reproductive tracts of SRY positive calves, shows anatomical abnormalities such as clitoris hypertrophia and cervical atresia. Histological examination of gonads of these animals confirmed the presence of ovotestis. This study confirms the usefulness of molecular biology techniques as diagnostic tools of the syndrome, for the use of replacement females in cattle.El síndrome Freemartin es un estado de intersexualidad de muchas de las hembras bovinas provenientes de parto múltiple heterosexual (macho - hembra). Éste se origina en la vida fetal entre los 30 y 40 días de gestación producto del intercambio transplacentario de células mediante anastomosis vasculares, presentándose fenómenos de quimerismo 60XX/XY en varios tejidos, y esterilidad consecuente. En el presente trabajo se tomaron 106 muestras de sangre de terneras provenientes de parto múltiple heterosexual, se realizó extracción de ADN de leucocitos y se buscó la amplificación del gen SRY asociado al cromosoma "Y" mediante PCR y lectura en gel de agarosa. 90 terneras (84.9%) de las 106 amplificaron SRY, verificando el quimerismo 60XX/XY, y 16 terneras (15.1%) que no amplificaron el gen, libres del síndrome quimérico y por lo tanto, aptas reproductivamente. El análisis citogenético realizado mediante cultivo de linfocitos demostró la presencia del cromosoma "Y" en linfocitos de hembras positivas a SRY y la ausencia del quimerismo en hembras SRY negativas. El análisis anatómico post mortem de tractos reproductivos de hembras positivas a SRY detectó anormalidades características del síndrome tales como, clítoris hipertrofiados y atresias ductales cervicales. El análisis histopatológico de placas de gónadas de estos animales evidenció la presencia de ovotestículos. El presente estudio confirma la utilidad de las técnicas de biología molecular como herramientas diagnósticas del síndrome, para el aprovechamiento de hembras de reemplazo al servicio del hato bovino

Molecular, cytogenetic and anatomohistopatologic diagnostic of freemartin syndrome on females cattle in

Freemartin syndrome is a intersexuality condition developed in many of the female calfs born from heterosexual multiple calvings (male female). This originates in the fetal development between 30 and 40 days of gestation with transplacental exchange of cells through vascular anastomosis, occurring 60XX/XY chimerism in various tissues, and consequent sterility. In this paper was took blood samples from 106 female calves born from a multiple heterosexual calving. DNA was extracted from leucocytes and searched the SRY gene amplification associated with the Y chromosome by PCR and reading in agarose gel. 90 of 106 samples (84.9%) was amplified the SRY gene, verifying the 60XX/XY chimerism, and 16 samples (15.1%) that did not amplify the gene. Cytogenetic analysis using lymphocytes cell cultures showed the presence of Y chromosome in samples positive for SRY and absence of chimerism in SRY negative samples. The postmortem analysis of female reproductive tracts of SRY positive calves, shows anatomical abnormalities such as clitoris hypertrophia and cervical atresia. Histological examination of gonads of these animals confirmed the presence of ovotestis. This study confirms the usefulness of molecular biology techniques as diagnostic tools of the syndrome, for the use of replacement females in cattle

Diagnóstico molecular, citogenético y anatomohistopatológico del Síndrome Freemartin en hembras bovinas en Colombia

El síndrome Freemartin es un estado de intersexualidad de muchas de las hembras bovinas provenientes de parto múltiple heterosexual (macho – hembra). Éste se origina en la vida fetal entre los 30 y 40 días de gestación producto del intercambio transplacentario de células mediante anastomosis vasculares, presentándose fenómenos de quimerismo 60XX/XY en varios tejidos, y esterilidad consecuente. En el presente trabajo se tomaron 106 muestras de sangre de terneras provenientes de parto múltiple heterosexual, se realizó extracción de ADN de leucocitos y se buscó la amplificación del gen SRY asociado al cromosoma “Y” mediante PCR y lectura en gel de agarosa. 90 terneras (84.9%) de las 106 amplificaron SRY, verificando el quimerismo 60XX/XY, y 16 terneras (15.1%) que no amplificaron el gen, libres del síndrome quimérico y por lo tanto, aptas reproductivamente. El análisis citogenético realizado mediante cultivo de linfocitos demostró la presencia del cromosoma “Y” en linfocitos de hembras positivas a SRY y la ausencia del quimerismo en hembras SRY negativas.  El análisis anatómico post mortem de tractos reproductivos de hembras positivas a SRY detectó anormalidades características del síndrome tales como, clítoris hipertrofiados y atresias ductales cervicales.  El análisis histopatológico de placas de gónadas de estos animales evidenció la presencia de ovotestículos. El presente estudio confirma la utilidad de las técnicas de biología molecular como herramientas diagnósticas del síndrome, para el aprovechamiento de hembras de reemplazo al servicio del hato bovino.Palabras clave: cariotipo, genotipificación, intersexualidad, quimerismo, SRY.Freemartin syndrome is a intersexuality condition developed in many of the female calfs born from heterosexual multiple calvings (male female). This originates in the fetal development between 30 and 40 days of gestation with transplacental exchange of cells through vascular anastomosis, occurring 60XX/XY chimerism in various tissues, and consequent sterility. In this paper was took blood samples from 106 female calves born from a multiple heterosexual calving. DNA was extracted from leucocytes and searched the SRY gene amplification associated with the Y chromosome by PCR and reading in agarose gel. 90 of 106 samples (84.9%) was amplified the SRY gene, verifying the 60XX/XY chimerism, and 16 samples (15.1%) that did not amplify the gene. Cytogenetic analysis using lymphocytes cell cultures showed the presence of Y chromosome in samples positive for SRY and absence of chimerism in SRY negative samples. The postmortem analysis of female reproductive tracts of SRY positive calves, shows anatomical abnormalities such as clitoris hypertrophia and cervical atresia. Histological examination of gonads of these animals confirmed the presence of ovotestis. This study confirms the usefulness of molecular biology techniques as diagnostic tools of the syndrome, for the use of replacement females in cattle.Keywords: Cariotype; chimerism; intersexuality; genotypification; SRY

El VI Encuentro Latinoamericano de Bibliotecarios, Archivistas y Museólogos

Se habla sobre el encuentro latinoamericano de Bibliotecología, Archivística y la Museología donde se reúnen expertos para llevar a cabo este evento de ciudad y el ITM será participe como sede de este encuentro.En Colombia y en especial en Medellín se lleva la vanguardia de especialistas de estas tres áreas