Measurement of event-shape observables in Z→ℓ+ℓ− events in pp collisions at √ s=7 TeV with the ATLAS detector at the LHC

Event-shape observables measured using charged particles in inclusive $Z$-boson events are presented, using the electron and muon decay modes of the $Z$ bosons. The measurements are based on an integrated luminosity of $1.1 {\rm fb}^{-1}$ of proton--proton collisions recorded by the ATLAS detector at the LHC at a centre-of-mass energy $\sqrt{s}=7$ TeV. Charged-particle distributions, excluding the lepton--antilepton pair from the $Z$-boson decay, are measured in different ranges of transverse momentum of the $Z$ boson. Distributions include multiplicity, scalar sum of transverse momenta, beam thrust, transverse thrust, spherocity, and $\mathcal{F}$-parameter, which are in particular sensitive to properties of the underlying event at small values of the $Z$-boson transverse momentum. The Sherpa event generator shows larger deviations from the measured observables than Pythia8 and Herwig7. Typically, all three Monte Carlo generators provide predictions that are in better agreement with the data at high $Z$-boson transverse momenta than at low $Z$-boson transverse momenta and for the observables that are less sensitive to the number of charged particles in the event.Comment: 36 pages plus author list + cover page (54 pages total), 14 figures, 4 tables, submitted to EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-0

Positive event diversity:Relationship with personality and well-being

OBJECTIVEExamining the personality and well-being correlates of positive event diversity.BACKGROUNDPast research has highlighted that personality traits are linked to the frequency of daily positive events. This study is the first to examine positive event diversity, the extent to which positive events are spread across multiple types of positive life domains, as well as its personality and well-being correlates.METHODWe conducted parallel analyses of three daily diary datasets (Ns = 1919, 744, and 1392) that included evening assessment of daily positive events and affective well-being. The Big Five personality traits were assessed in baseline surveys.RESULTSPositive Event Diversity was related to higher person-mean daily positive affect but not negative affect. Higher Extraversion, Agreeableness, Openness, and lower Neuroticism were correlated with more positive event diversity. These associations became nonsignificant when controlling for positive event frequency. Positive event frequency moderated the link between positive event diversity and person-mean affect, such that higher positive event diversity was associated with higher negative and lower positive affect for people who experienced more frequent positive events.CONCLUSIONSNo consistent evidence was found for personality as a moderator of the positive event diversity-well-being link across the three studies. Further, the well-being implications of positive event diversity may be better understood when interpreting them alongside indexes of positive event frequency.</p

Positive event diversity and age:Testing curvilinear associations

Prior research has found that older adults report more frequent positive events compared to younger and middle-aged adults. It remains unknown, however, to what extent age is related to experiencing positive events spread across different positive event types (i.e., positive event diversity, PED). We therefore examined age differences in PED and its affective well-being correlates across three large daily diary datasets: wave 2 (N = 1919) and the Refresher sample (N = 744) of the National Studies of Daily Experiences, and the Coping with the COVID-19 Outbreak Study (N = 1392). We used Shannon’s Entropy to quantify PED. There was a curvilinear association between PED and age, indicating that PED was higher among middle-aged compared to younger and older adults. On a zero-order basis, PED was correlated with higher positive affect and uncorrelated with negative affect. However, the pattern of results changed when considering positive event frequency as a moderator. Among people with high positive event frequency, PED was linked to higher negative and lower positive affect, but not associated with either positive or negative affect at low levels of positive event frequency. These relationships did not differ by age. This study suggests that middle-aged adults experience the widest range of positive event types, perhaps reflecting the diverse set of social roles that middle-aged adults often fulfill (e.g., worker, parent, partner). In addition, there might be negative consequences to experiencing a lot of positive events across very different contexts which may indicate social role strain

Nightly sleep predicts next-morning expectations for stress and positive experiences

Objectives Abundant research has linked nightly sleep as an antecedent of daily psychosocial experiences; however, less is known about sleep’s influence on daily expectations of these experiences. Therefore, this research examined the day-to-day associations of sleep quality, duration, and efficiency with next-day expectations for stress(ors) and positive experiences, as well as whether these expectations were related to end-of-day reports of physical symptoms.Methods In Study 1, U.S. adults (n = 354; ages 19 to 74) completed twice-daily diaries for 10 weekdays about sleep, expectations for encountering daily stressors and positive events, and physical symptoms. In Study 2, adults in Canada (n = 246; ages 25 to 87) wore a sleep watch for 14 consecutive days and completed mobile surveys 5x/day about sleep, stressfulness and pleasantness expectations, and physical symptoms.Results Multilevel models indicated that self-reported sleep quality and duration, but not efficiency, were associated with lower next-day expectations for stressors (Study 1) and stressfulness (Study 2). Self-reported sleep quality (Study 1) and all sleep indices (Study 2) predicted greater next-day expectations for positive events and pleasantness, respectively. For actigraphy-assessed sleep (Study 2), only longer-than-usual actigraphic sleep duration was associated with lower stressfulness expectations, whereas both sleep duration and efficiency were positively linked with daily pleasantness expectations. Only pleasantness expectations (Study 2)—but not daily stressfulness and event expectations (Study 1)—predicted end-of-day physical symptoms.Conclusion Findings suggest the importance of sleep on expectations of next-day stress and positive experiences, of which may have implications for daily physical health

La chiesa di San Vincenzo a Modena. Ecclesia Divi Vincentii

Un complesso intervento di restauro ha restituito la chiesa di San Vincenzo, voluta nel Seicento dai Chierici Regolari Teatini, non solo a Modena e ai modenesi ma a tutti coloro che vorranno ripercorrere un suggestivo itinerario tra raffinatezza ed eleganti sinuosità delle espressioni artistiche seicentesche e austere raffigurazioni ottocentesche che introducono il visitatore alla singolare e suggestiva cappella mortuaria estense annessa alla chiesa.Qui il visitatore è circondato dalla memoria dei duchi d'Este, dalle loro consorti e dei loro figli che con i loro nomi e le loro presenze ricordano due secoli e mezzo di storia cittadina, da quando Modena, con Francesco I, era capitale del ducato estense fino alla Restaurazione con l'arciduca Francesco IV d'Austria-Este. Tuttavia anche il frequentatore meno attento è avvolto dalla suggestione di un luogo singolare, sacro e funerario, evocatore di memorie lontane e non può fare a meno di ripercorrere con lo sguardo nomi e date che si riferiscono a tempi ormai lontani

Electrical characteristics of silicon pixel detectors

Prototype sensors for the ATLAS silicon pixel detector have been electrically characterized. The current and voltage characteristics, charge-collection efficiencies, and resolutions have been examined. Devices were fabricated on oxygenated and standard detector-grade silicon wafers. Results from prototypes which examine p-stop and standard and moderated p-spray isolation are presented for a variety of geometrical options. Some of the comparisons relate unirradiated sensors with those that have received fluences relevant to LHC operation

Search for a heavy Standard Model Higgs boson in the channel H→ZZ→l+l−qqˉH\rightarrow ZZ\rightarrow l^{+}l^{-} q\bar{q} using the ATLAS detector

A search for a heavy Standard Model Higgs boson decaying via H->ZZ->llqq, where l=e,mu, is presented. The search is performed using a data set of pp collisions at sqrt(s)=7 TeV, corresponding to an integrated luminosity of 1.04 fb^-1 collected in 2011 by the ATLAS detector at the CERN LHC collider. No significant excess of events above the estimated background is found. Upper limits at 95% confidence level on the production cross section (relative to that expected from the Standard Model) of a Higgs boson with a mass in the range between 200 and 600 GeV are derived. Within this mass range, there is at present insufficient sensitivity to exclude a Standard Model Higgs boson. For a Higgs boson with a mass of 360 GeV, where the sensitivity is maximal, the observed and expected cross section upper limits are factors of 1.7 and 2.7, respectively, larger than the Standard Model prediction.Comment: 11 pages plus author list (26 pages total), 4 figures, 1 table, final version to appear in Physics Letters

Measurement of the isolated diphoton cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

15 pages plus author list (27 pages total), 9 figures, 2 tables, submitted to Phys. Rev. DThe ATLAS experiment has measured the production cross-section of events with two isolated photons in the final state, in proton-proton collisions at sqrt(s) = 7 TeV. The full data set acquired in 2010 is used, corresponding to an integrated luminosity of 37 pb-1. The background, consisting of hadronic jets and isolated electrons, is estimated with fully data-driven techniques and subtracted. The differential cross-sections, as functions of the di-photon mass, total transverse momentum and azimuthal separation, are presented and compared to the predictions of next-to-leading-order QCD

Measurement of the isolated diphoton cross-section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

The ATLAS experiment has measured the production cross-section of events with two isolated photons in the final state, in proton-proton collisions at sqrt(s) = 7 TeV. The full data set acquired in 2010 is used, corresponding to an integrated luminosity of 37 pb^-1. The background, consisting of hadronic jets and isolated electrons, is estimated with fully data-driven techniques and subtracted. The differential cross-sections, as functions of the di-photon mass, total transverse momentum and azimuthal separation, are presented and compared to the predictions of next-to-leading-order QCD.Comment: 15 pages plus author list (27 pages total), 9 figures, 2 tables, final version to appear in Physical Review