Branching Fractions for D0 -> K+K- and D0 -> pi+pi-, and a Search for CP Violation in D0 Decays

Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we have measured ratios of branching fractions for the two-body singly-Cabibbo-suppressed charged decays of the D0: (D0 -> KK)/(D0 -> Kpi) = 0.109 +- 0.003 +- 0.003, (D0 -> pipi)/(D0 -> Kpi) = 0.040 +- 0.002 +- 0.003, and (D0 -> KK)/(D0 -> pipi) = 2.75 +- 0.15 +- 0.16. We have looked for differences in the decay rates of D0 and D0bar to the CP eigenstates K+K- and pi+pi-, and have measured the CP asymmetry parameters A_CP(K+K-) = -0.010 +- 0.049 +- 0.012 and A_CP(pi+pi-) = -0.049 +- 0.078 +- 0.030, both consistent with zero.Comment: 10 Postscript pages, including 2 figures. Submitted to Phys. Lett.

Place, health and dis/advantage: a sociomaterial analysis.

The substantial literature on interactions between places/spaces and well-being/health often differentiate between physical and social aspects of geographical location. This paper sidesteps this dualism, instead considering places as sociomaterial assemblages of human and non-human materialities. It uses this posthuman and ‘new materialist’ perspective to explore how place-assemblages affect human capacities, in terms of both health and social dis/advantage. Based on secondary analysis of interview data on human/place interactions, it analyses the physical, sociocultural, psychological and emotional effects of place-assemblages, assessing how these produce opportunities for, and constraints upon human bodies. It than assesses how these emergent capacities affect both social dis/advantage and well-being. This analysis of how place-assemblages contribute positively or negatively to health and dis/advantage offers possibilities for further research and for social and public health policy

The micropolitics of behavioural interventions: a new materialist analysis

Behavioural approaches are increasingly used in both the global North and South as means to effect government policy. These interventions aim to encourage preferred behaviours by subtly shaping choices, applying incentives or employing punitive measures. Recent digital technology developments extend the reach of these behavioural approaches. While these approaches have been criticised from political science perspectives, in this paper we apply an innovative mode of analysis of behavioural policy approaches founded in a ‘new materialist’ ontology of affects, assemblages and capacities. This perspective enables us to explore their ‘micropolitical’ impact—on those who are their subjects, but also upon the wider sociocultural contexts within which they have been implemented. We examine two different behavioural interventions: the use of vouchers to incentivise new mothers to breastfeed their infants (a practice associated with improved health outcomes in both childhood and later life), and uses of debit card technologies in Australia to limit welfare recipients’ spending on alcohol, drugs and gambling. In each case, we employ a materialist methodology to analyse precisely what these interventions do, and what (in)capacities they produce in their targeted groups. From these we draw out a more generalised critique of behavioural approaches to policy implementation

Economics, the climate change policy-assemblage and the new materialisms: towards a comprehensive policy

Climate change policy is a contested field, with rival perspectives underpinning radically different policy propositions: from encouraging the market to innovate technical solutions to climate change through to the replacement of a market economy with an eco-socialist model. These differing policy options draw upon a variety of economic concepts and approaches, with significant consequent divergences in their policy recommendations. In this paper, we consider policy as assembled from a wide range of sociomaterial components – some human, others non-human. Using a ‘new materialist’ toolkit, we explore four contemporary climate change policies to unpack these policy-assemblages, and assess the different uses made of economics in each assemblage. We conclude that none of these contemporary policies is adequate to address climate change. Yet despite the incommensurability between how these disparate policies use economic concepts and theories, we suggest a materialist synthesis based on a comprehensive climate change policy-assemblage

Doing new materialist data analysis : a Spinozo-Deleuzian ethological toolkit

With growing social science interest in new materialist and posthuman ontologies, it is timely to explore how these may translate practically into social research methodologies. This task is complicated by differing interpretations of how new materialist precepts should shape research. This paper aims to fill a gap in the literature by setting out a methodology using one specific thread within the new materialisms: Deleuzian ‘ethology’. Inspired by Spinoza’s Ethics, Deleuze established a conceptual toolkit for ethological inquiry, comprising ‘relation’, ‘assemblage’, ‘affect’ and ‘capacity’. We show how this toolkit translates into a design for analysing empirical data. Effective data analysis also depends on the adequacy and appropriateness of earlier stages in the research process. We therefore also consider an ethological approach to setting a research question, choosing data collection methods and presenting study findings. We conclude with some reflections on the challenges of translating philosophical theory into social science methodology

The more-than-human micropolitics of the dissection assemblage: what can a ‘dead’ body do?

Posthumanism offers a unique opportunity to examine the relationship between dead and living bodies. In this article, we explore one setting in which matter – conventionally considered as ‘dead’, demonstrates its continued vitality: the anatomical dissection room. Using data from interview transcripts, we report on the affect (capacities to affect and be affected) within this space, to reveal the micropolitics of dissection. Analysis of the ‘dissection-assemblage’ reveals how interactions between the living – students, teachers, technicians – and dead bodies not only produce knowledge and understanding of human anatomy but also show how the dead body gains new capacities to affect living bodies psychologically, emotionally and physiologically. While conventional humanist discussions of dissection have addressed how these interactions ‘de-humanise’ and ‘re-humanise’ the cadaver in this particular setting, this analysis discloses a complex micropolitics in which the conventional distinction between ‘living’ and ‘dead’ ignores the multiple ways in which all matter is vitally affective

Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt(s)=1.96 TeV using Lepton + Jets Events with Lifetime b-tagging

We present a measurement of the top quark pair ($t\bar{t}$) production cross section ($\sigma_{t\bar{t}}$) in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV using 230 pb$^{-1}$ of data collected by the D0 experiment at the Fermilab Tevatron Collider. We select events with one charged lepton (electron or muon), missing transverse energy, and jets in the final state. We employ lifetime-based b-jet identification techniques to further enhance the $t\bar{t}$ purity of the selected sample. For a top quark mass of 175 GeV, we measure $\sigma_{t\bar{t}}=8.6^{+1.6}_{-1.5}(stat.+syst.)\pm 0.6(lumi.)$ pb, in agreement with the standard model expectation.Comment: 7 pages, 2 figures, 3 tables Submitted to Phys.Rev.Let

Search for the standard model Higgs boson in tau final states

We present a search for the standard model Higgs boson using hadronically decaying tau leptons, in 1 inverse femtobarn of data collected with the D0 detector at the Fermilab Tevatron ppbar collider. We select two final states: tau plus missing transverse energy and b jets, and tau+ tau- plus jets. These final states are sensitive to a combination of associated W/Z boson plus Higgs boson, vector boson fusion and gluon-gluon fusion production processes. The observed ratio of the combined limit on the Higgs production cross section at the 95% C.L. to the standard model expectation is 29 for a Higgs boson mass of 115 GeV.Comment: publication versio

Measurement of D*+/- meson production in jets from pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

This paper reports a measurement of D*+/- meson production in jets from proton-proton collisions at a center-of-mass energy of sqrt(s) = 7 TeV at the CERN Large Hadron Collider. The measurement is based on a data sample recorded with the ATLAS detector with an integrated luminosity of 0.30 pb^-1 for jets with transverse momentum between 25 and 70 GeV in the pseudorapidity range |eta| < 2.5. D*+/- mesons found in jets are fully reconstructed in the decay chain: D*+ -> D0pi+, D0 -> K-pi+, and its charge conjugate. The production rate is found to be N(D*+/-)/N(jet) = 0.025 +/- 0.001(stat.) +/- 0.004(syst.) for D*+/- mesons that carry a fraction z of the jet momentum in the range 0.3 < z < 1. Monte Carlo predictions fail to describe the data at small values of z, and this is most marked at low jet transverse momentum.Comment: 10 pages plus author list (22 pages total), 5 figures, 1 table, matches published version in Physical Review

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results