Variable Flavor Number Scheme for Final State Jets

We discuss a variable flavor number scheme (VFNS) for final state jets which can account for the effects of arbitrary finite quark masses in inclusive jet observables. The scheme is a generalization of the VFNS scheme for PDFs applied to setups with additional dynamical scales and relies on appropriate renormalization conditions for the matrix elements in the factorization theorem. We illustrate general properties by means of the example of deep-inelastic scattering (DIS) in the endpoint region $x\rightarrow 1$ and event shapes in the dijet limit, in particular the calculations of threshold corrections, consistency conditions and relations to mass singularities found in fixed-order massive calculations.Comment: 7 pages, 4 figures, Proceedings of the XXII. International Workshop on Deep-Inelastic Scattering and Related Subjects, 28 April - 2 May 2014, Warsaw, Polan

Factorization and Resummation for Massive Quark Effects in Exclusive Drell-Yan

Exclusive differential spectra in color-singlet processes at hadron colliders are benchmark observables that have been studied to high precision in theory and experiment. We present an effective-theory framework utilizing soft-collinear effective theory to incorporate massive (bottom) quark effects into resummed differential distributions, accounting for both heavy-quark initiated primary contributions to the hard scattering process as well as secondary effects from gluons splitting into heavy-quark pairs. To be specific, we focus on the Drell-Yan process and consider the vector-boson transverse momentum, $q_T$, and beam thrust, $\mathcal T$, as examples of exclusive observables. The theoretical description depends on the hierarchy between the hard, mass, and the $q_T$ (or $\mathcal T$) scales, ranging from the decoupling limit $q_T \ll m$ to the massless limit $m \ll q_T$. The phenomenologically relevant intermediate regime $m \sim q_T$ requires in particular quark-mass dependent beam and soft functions. We calculate all ingredients for the description of primary and secondary mass effects required at NNLL$'$ resummation order (combining NNLL evolution with NNLO boundary conditions) for $q_T$ and $\mathcal T$ in all relevant hierarchies. For the $q_T$ distribution the rapidity divergences are different from the massless case and we discuss features of the resulting rapidity evolution. Our results will allow for a detailed investigation of quark-mass effects in the ratio of $W$ and $Z$ boson spectra at small $q_T$, which is important for the precision measurement of the $W$-boson mass at the LHC.Comment: 42 pages + appendices, 21 figures; v2: journal versio

Domains of physical activity and all-cause mortality: systematic review and dose-response meta-analysis of cohort studies

Background The dose-response relation between physical activity and all-cause mortality is not well defined at present. We conducted a systematic review and meta-analysis to determine the association with all-cause mortality of different domains of physical activity and of defined increases in physical activity and energy expenditure. Methods MEDLINE, Embase and the Cochrane Library were searched up to September 2010 for cohort studies examining all-cause mortality across different domains and levels of physical activity in adult general populations. We estimated combined risk ratios (RRs) associated with defined increments and recommended levels, using random-effects meta-analysis and dose-response meta-regression models. Results Data from 80 studies with 1 338 143 participants (118 121 deaths) were included. Combined RRs comparing highest with lowest activity levels were 0.65 [95% confidence interval (95% CI) 0.60-0.71] for total activity, 0.74 (95% CI 0.70-0.77) for leisure activity, 0.64 (95% CI 0.55-0.75) for activities of daily living and 0.83 (95% CI 0.71-0.97) for occupational activity. RRs per 1-h increment per week were 0.91 (95% CI 0.87-0.94) for vigorous exercise and 0.96 (95% CI 0.93-0.98) for moderate-intensity activities of daily living. RRs corresponding to 150 and 300 min/week of moderate to vigorous activity were 0.86 (95% CI 0.80-0.92) and 0.74 (95% CI 0.65-0.85), respectively. Mortality reductions were more pronounced in women. Conclusion Higher levels of total and domain-specific physical activity were associated with reduced all-cause mortality. Risk reduction per unit of time increase was largest for vigorous exercise. Moderate-intensity activities of daily living were to a lesser extent beneficial in reducing mortalit

On the Cutoff Dependence of the Quark Mass Parameter in Angular Ordered Parton Showers

We show that the presence of an infrared cutoff $Q_0$ in the parton shower (PS) evolution for massive quarks implies that the generator quark mass corresponds to a $Q_0$-dependent short-distance mass scheme and is therefore not the pole mass. Our analysis considers an angular ordered parton shower based on the coherent branching formalism for quasi-collinear stable heavy quarks and splitting functions at next-to-leading logarithmic (NLL) order, and it is based on the analysis of the peak of hemisphere jet mass distributions. We show that NLL shower evolution is sufficient to describe the peak jet mass at full next-to-leading order (NLO). We determine the relation of this short-distance mass to the pole mass at NLO. We also show that the shower cut $Q_0$ affects soft radiation in a universal way for massless and quasi-collinear massive quark production. The basis of our analysis is (i) an analytic solution of the PS evolution based on the coherent branching formalism, (ii) an implementation of the infrared cut $Q_0$ of the angular ordered shower into factorized analytic calculations in the framework of Soft-Collinear-Effective-Theory (SCET) and (iii) the dependence of the peak of the jet mass distribution on the shower cut. Numerical comparisons to simulations with the HERWIG 7 event generator confirm our findings. Our analysis provides an important step towards a full understanding concerning the interpretation of top quark mass measurements based on direct reconstruction.Comment: 110 pages, 23 figures; v2: improved version, references updated, typos eliminate

Die Einführung der Dekaproten und Eikosaproten in den Städten Kleinasiens und Griechenlands

Die Dekaproten und Eikosaproten, die für die Einhebung römischer Steuern verantwortlich waren, erscheinen in griechischen Städten ab dem späten 1. Jh. Der Artikel befasst sich in erster Linie mit der Frage nach der Entstehung und der Verbreitung dieses Amtes, die wahrscheinlich auf Anregung römischer Behörden geschah. Die Dekaprotie ist in den verschiedenen Städten und Provinzen des Reiches unterschiedlich gut bezeugt. Die konkrete Ausgestaltung des Amtes scheint lokalen und regionalen Besonderheiten unterworfen gewesen zu sein. In Kleinasien lässt sich vor allem in Lykien eine frühe und wohl flächendeckende Einführung des Amtes nachweisen, möglicherweise gleichzeitig mit der Provinzgründung, während das Amt in anderen Regionen vielleicht erst später eingeführt wurde und nicht überall die gleiche Bedeutung erlangte.The dekaprotoi and the eikosaprotoi, who were responsible for collecting imperial taxes, appeared in the Greek cities at the end of the Ist century. This article primarily examines the establishment of these officials and their dispersion, which probably occurred at the suggestion of the Roman administration. The dekaprotia is unequally well-attested in the different cities and provinces of the Empire. Its organization seemed to have followed the local and regional characteristics. In Asia Minor, Lycia received the office early, possibly simultaneously with the creation of the province, while the dekaprotia was perhaps established later in the other regions, and did not have the same significance everywhere.Les dekaprotoi et les eikosaprotoi, responsables du prélèvement des impôts impériaux, apparurent dans les cités grecques à la fin du Ier siècle. Cet article se penche essentiellement sur la question de l’apparition et de la diffusion de ces fonctions, qui se produisit probablement sous l’instigation de l’administration romaine. La dekaprotia est inégalement attestée dans les cités et provinces de l’Empire. L’organisation concrète de cette charge semble avoir été soumise aux particularités locales et régionales. En Asie Mineure, la Lycie connut une introduction précoce et généralisée de cette fonction, possiblement simultanément à la création de la province, alors que la charge fut peut-être instaurée plus tard dans les autres régions et sa signification différait probablement selon les endroits

Un decreto dalla Licia (Antiphellos) a Lemnos: la riscoperta di una pietra errante

Una stele frammentaria, la cui presenza è ricordata a Καστελλόριζο (antica Megiste) nel 1907, fu trasferita insieme ad altre iscrizioni a Mytilene (Lesbos) e di qui a Lemnos, dove è tuttora conservata presso il Museo Archeologico di Myrina. Il testo, che era noto solo da una approssimativa edizione del 1917, è qui pubblicato per la prima volta secondo i moderni canoni scientifici. Esso conserva un decreto onorario di età ellenistica per un benefattore locale del ginnasio. Il presente contributo intende inoltre ricostruire le vicende erranti della pietra e stabilire la sua provenienza originaria. Identifica in particolare la comunità committente con la polis di Antiphellos (Lycia), che accoglie una precedente iniziativa onoraria deliberata da un raggruppamento interno del locale ginnasio. Sottolinea inoltre la volontà della città di confermare gli onori e di assicurare la loro attuazione nel tempo attraverso il riferimento a specifici garanti. Propone infine di riconoscere nell’anonimo onorato un benefattore che potrebbe aver costituito una fondazione per i neoi o per altro gruppo ginnasiale.A fragmentary stele, which was recorded at Καστελλόριζο (ancient Megiste) in 1907, was transferred along with other inscriptions to Mytilene (Lesbos) and from there to Lemnos, where it is still preserved at the Archaeological Museum of Myrina. The text, which was so far only known from an unsatisfying edition of 1917, is for the first time published according to modern standards. It contains a Hellenistic honorary decree for a local benefactor of the gymnasium. The present paper further intends to reconstruct the wanderings of the stone and establish its original provenance. It identifies in particular the committing community with the polis of Antiphellos (Lycia), which ratifies a previous honorary initiative deliberated by an inner group of the local gymnasium. It also underlines the city’s commitment to confirm the honors and to ensure their implementation in the future by referring to specific guarantees. Finally, it proposes to recognize in the anonymous honorand a benefactor who could have constituted a foundation for the neoi or for another gymnasium group

Un decreto dalla Licia (Antiphellos) a Lemnos: la riscoperta di una pietra errante.

Una stele frammentaria, la cui presenza è ricordata a Καστελλόριζο (antica Megiste) nel 1907, fu trasferita insieme ad altre iscrizioni a Mytilene (Lesbos) e di qui a Lemnos, dove è tuttora conservata presso il Museo Archeologico di Myrina. Il testo, che era noto solo da una approssimativa edizione del 1917, è qui pubblicato per la prima volta secondo i moderni canoni scientifici. Esso conserva un decreto onorario di età ellenistica per un benefattore locale del ginnasio. Il presente contributo intende inoltre ricostruire le vicende erranti della pietra e stabilire la sua provenienza originaria. Identifica in particolare la comunità committente con la polis di Antiphellos (Lycia), che accoglie una precedente iniziativa onoraria deliberata da un raggruppamento interno del locale ginnasio. Sottolinea inoltre la volontà della città di confermare gli onori e di assicurare la loro attuazione nel tempo attraverso il riferimento a specifici garanti. Propone infine di riconoscere nell’anonimo onorato un benefattore che potrebbe aver costituito una fondazione per i neoi o per altro gruppo ginnasiale. A fragmentary stele, which was recorded at Καστελλόριζο (ancient Megiste) in 1907, was transferred along with other inscriptions to Mytilene (Lesbos) and from there to Lemnos, where it is still preserved at the Archaeological Museum of Myrina. The text, which was so far only known from an unsatisfying edition of 1917, is for the first time published according to modern standards. It contains a Hellenistic honorary decree for a local benefactor of the gymnasium. The present paper further intends to reconstruct the wanderings of the stone and establish its original provenance. It identifies in particular the committing community with the polis of Antiphellos (Lycia), which ratifies a previous honorary initiative deliberated by an inner group of the local gymnasium. It also underlines the city’s commitment to confirm the honors and to ensure their implementation in the future by referring to specific guarantees. Finally, it proposes to recognize in the anonymous honorand a benefactor who could have constituted a foundation for the neoi or for another gymnasium group

Systematic review and meta-analysis of reduction in all-cause mortality from walking and cycling and shape of dose response relationship

BACKGROUND AND OBJECTIVE: Walking and cycling have shown beneficial effects on population risk of all-cause mortality (ACM). This paper aims to review the evidence and quantify these effects, adjusted for other physical activity (PA). DATA SOURCES: We conducted a systematic review to identify relevant studies. Searches were conducted in November 2013 using the following health databases of publications: Embase (OvidSP); Medline (OvidSP); Web of Knowledge; CINAHL; SCOPUS; SPORTDiscus. We also searched reference lists of relevant texts and reviews. STUDY ELIGIBILITY CRITERIA AND PARTICIPANTS: Eligible studies were prospective cohort design and reporting walking or cycling exposure and mortality as an outcome. Only cohorts of individuals healthy at baseline were considered eligible. STUDY APPRAISAL AND SYNTHESIS METHODS: Extracted data included study population and location, sample size, population characteristics (age and sex), follow-up in years, walking or cycling exposure, mortality outcome, and adjustment for other co-variables. We used random-effects meta-analyses to investigate the beneficial effects of regular walking and cycling. RESULTS: Walking (18 results from 14 studies) and cycling (8 results from 7 studies) were shown to reduce the risk of all-cause mortality, adjusted for other PA. For a standardised dose of 11.25 MET.hours per week (or 675 MET.minutes per week), the reduction in risk for ACM was 11% (95% CI = 4 to 17%) for walking and 10% (95% CI = 6 to 13%) for cycling. The estimates for walking are based on 280,000 participants and 2.6 million person-years and for cycling they are based on 187,000 individuals and 2.1 million person-years. The shape of the dose-response relationship was modelled through meta-analysis of pooled relative risks within three exposure intervals. The dose-response analysis showed that walking or cycling had the greatest effect on risk for ACM in the first (lowest) exposure interval. CONCLUSIONS AND IMPLICATIONS: The analysis shows that walking and cycling have population-level health benefits even after adjustment for other PA. Public health approaches would have the biggest impact if they are able to increase walking and cycling levels in the groups that have the lowest levels of these activities. REVIEW REGISTRATION: The review protocol was registered with PROSPERO (International database of prospectively registered systematic reviews in health and social care) PROSPERO 2013: CRD42013004266