2,051 research outputs found
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Institutional reform in emerging securities markets
No full textIn the long run, sound, efficient securities markets can contribute to economic growth; in the short run, they play an important role in financial liberalization. The author provides a guide to issues involved in institutional and regulatory reform of securities markets - and a discussion of the practical implications of different policy options and sequencing decisions. He argues that establishing sound securities markets requires institutional development that is a substantial task for many developing countries. Prerequisities for the development of securities markets include: (a) a macroeconomic and fiscal environment conducive to the supply of quality securities; (b) a legal, regulatory, and institutional infrastructure that can support efficient operation of the securities market. Essentially such an infrastructure must provide four things: (a) certainty about property rights and contracts; (b) transparent trading and other procedures and public disclosure by companies of all information relevant to the value of their securities; (c) protection against unfair practices by insiders and intermediaries; and (d) protection against the financial failure of intermediaries and market institutions such as clearinghouses. The author also provides examples of the policy conflicts and uncertainties that are routine in securities market reform and development, and suggests approaches to managing them.Financial Intermediation,Environmental Economics&Policies,Insurance&Risk Mitigation,Banks&Banking Reform,Economic Theory&Research
Prompt charm production in pp collisions at √<span style="text-decoration:overline">s</span>=7 TeV
No full textCharm production at the LHC in pp collisions at s√=7 TeV is studied with the LHCb detector. The decays D0→K−π+, D+→K−π+π+, D⁎+→D0(K−π+)π+, D+s→ϕ(K−K+)π+, Λ+c→pK−π+, and their charge conjugates are analysed in a data set corresponding to an integrated luminosity of 15 nb−1. Differential cross-sections dσ/dpT are measured for prompt production of the five charmed hadron species in bins of transverse momentum and rapidity in the region 0<pT<8 GeV/c and 2.0<y<4.5. Theoretical predictions are compared to the measured differential cross-sections. The integrated cross-sections of the charm hadrons are computed in the above pT-y range, and their ratios are reported. A combination of the five integrated cross-section measurements gives
σ(cc¯)pT<8 GeV/c,2.0<y<4.5=1419±12(stat)±116(syst)±65(frag) μb,
where the uncertainties are statistical, systematic, and due to the fragmentation functions
A Meta-Analysis of Genome-Wide Association Scans Identifies IL18RAP, PTPN2, TAGAP, and PUS10 As Shared Risk Loci for Crohn's Disease and Celiac Disease
No full textThis is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Measurement of the inclusive φ cross-section in pp collisions at √s=7 TeV
No full textThe cross-section for inclusive φ meson production in pp collisions at a centre-of-mass energy of √s = 7 TeV has been measured with the LHCb detector at the Large Hadron Collider. The differential cross-section is measured as a function of the φ transverse momentum pT and rapidity y in the region 0.6< pT <5.0 GeV/c and 2.44< y <4.06. The cross-section for inclusive φ production in this kinematic range is σ(pp→φX)=1758±19(stat) +43−14(syst)±182(scale) μb, where the first systematic uncertainty depends on the pT and y region and the second is related to the overall scale. Predictions based on the Pythia 6.4 generator underestimate the cross-section
Cycling on the Verge? Exploring the Place of Utility Cycling in Contemporary New Zealand Transport Policy
No full textEfforts to increase cycling as a mode of transport (utility cycling) occur at central, regional and local levels of government through a range of supportive strategies, research, and guidelines. Despite these efforts, utility cycling levels in New Zealand have remained persistently low. This thesis examines the apparent disparity between policy intent and policy result, using a discourse analytical approach. It examines how cycling is positioned in contemporary New Zealand transport policy documents, and explores whose priorities are shaping transport policy with what implications for utility cycling.
This study uses a critical discourse analysis (CDA) approach to analyse the land transport documents from across the institutions of government. The CDA approach, grounded in the work of van Dijk and Fairclough, draws on ideas from the interpretive tradition of discourse analysis, inspired by Foucault’s concepts of knowledge and power. This approach reveals the position of utility cycling by exposing the framing, dominant discourses, and discursive strategies that privilege certain transport objectives and activities over others.
The findings show transport is promoted almost exclusively by central government as an activity to facilitate economic growth and efficiency, despite its potential (and actual) impacts on health and well-being, social justice, and environmental sustainability. The discursive practices of the government privilege private motor vehicle use, helping to both legitimate and maintain that privilege at all levels of government, while positioning utility cycling as a marginalised mode of transport.
This thesis contributes to scholarship on utility cycling and land transport policy in New Zealand by identifying how the discursive strategies of government control the position of utility cycling in New Zealand. This study underscores the need for a central government-led, long-term strategic vision for a genuinely integrated, multi-modal transport system, in order for the benefits of utility cycling to be fully maximised
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
No full textAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
Measurement of the branching fraction
No full textThe B
0
s
→ J/ψK
0
S
branching fraction is measured in a data sample corresponding to 0.41 fb−1
of integrated luminosity collected with the LHCb detector at the LHC. This channel is sensitive to
the penguin contributions affecting the sin 2β measurement from B
0
→ J/ψK
0
S
. The time-integrated
branching fraction is measured to be B(B
0
s
→ J/ψK
0
S
) = (1.83±0.28)×10−5
. This is the most precise
measurement to date
Designing pro-poor water and sewer concessions : early lessons from Bolivia
No full textThe Bolivian government awarded a concession for water and sewer services in La Pazand El Alto in 1997. One goal of doing so was to expand in-house water and sewer service to low-income households. The author uses the Aguas del Illimani case to explore how the design of typical concession agreements (with monopoly private service suppliers) can affect outcomes in poor neighborhoods. She finds that outcomes in services can be affected by the concession contracts, by the contract bid process, by sector regulations, and by regulatory arrangements. To increase the likelihood of improvements in low-income areas, policymakers should: a) Make contract objectives clear and easily measurable. b) Eliminate policy barriers to serving the poor (including property title requirements and service boundaries that exclude poor neighborhoods). c) Design financial incentives consistent with service expansion or improved objectives for low-income areas. Contracts are subject to negotiation, so expansion or connection mandates alone do not guarantee that concessionaires will serve poor areas. Provisions and standards that reduce service options (for example, requirements that eliminate all alternatives to in-house connections) or restrict the emergence of new service providers (for example, granting exclusivity in the service area) could do more harm than good. In two years of operation, Aguas del Illimani met its first expansion mandate and tool many steps to facilitate income areas. The company and the Bolivian water regulator were willing to discuss and seek possible solutions to problems associated with servicing poor neighborhoods. It is too early to tell whether these gains will be sustainable or to predict how privatization will ultimately affect poor households in La Paz and El Alto.Water and Industry,Water Conservation,Sanitation and Sewerage,Environmental Economics&Policies,Health Economics&Finance,Urban Water Supply and Sanitation,Water and Industry,Water Conservation,Town Water Supply and Sanitation,Water Supply and Sanitation Governance and Institutions
Code and Data Availability of the paper: Mapping tree diversity in the tropical forest region of Chocó-Colombia
No full textCode and Data Availability of the paper: Mapping tree diversity in the tropical forest region of Chocó-Colombia
Published at Environmental Research Letters: https://doi.org/10.1088/1748-9326/abf58a
J Camilo Fagua1, Patrick Jantz1, Patrick Burns1, Richard Massey1, Jeiner Y Buitrago2, Sassan S. Saatchi3, Christopher Hakkenberg1 and Scott J. Goetz1
1 Global Earth Observation & Dynamics of Ecosystems Lab (GEODE), School of Informatics, Computing, and Cyber Systems (SICCS), Northern Arizona University, Flagstaff, Arizona, US.
2 Department of Agronomy, Faculty of Agricultural Sciences, Universidad Nacional de Colombia. Bogota (Colombia).
3 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
*Corresponding author: J. Camilo Fagua, School of Informatics, Computing, and Cyber Systems (Building #90) 1295 S. Knoles Dr. Flagstaff, AZ 86011. Email: [email protected] and [email protected]
1) The files “1_Forest_Structure_maps_in_tif” contain seven maps of forest structural metrics for the Chocó region of Colombia at 50m of spatial resolution in the raster format .tif
(a) Canopy height (CH) map: CHOCO_MAP_CH
(b) 50th percentile of heights (z_50) map: CHOCO_MAP_z_50
(c) Vertical Canopy Heterogeneity (VCH) map: CHOCO_MAP_VCH
(d) Standard deviation of normalized heights (z_SD) map: CHOCO_MAP_z_SD
(e) Horizontal standard deviation of canopy height (CH_ SD): CHOCO_MAP_CH_SD
(f) Horizontal heterogeneity of canopy height (CH_H): CHOCO_MAP_CH_H
(g) Rumple Index of canopy height (R_INDEX): CHOCO_MAP_R_INDEX
2) The file “2_Diversity_maps_in_tif” contains five maps of forest structural metrics for the Chocó region of Colombia at 50m of spatial resolution in the raster format .tif
(a) Species richness (Richness): MAPS_MEAN_Richness
(b) Shannon’s entropy index (ENS-Shannon): MAPS_MEAN_ENS_shannon
(c) Simpson’s concentration index (ENS-Simpson): MAPS_MEAN_ENS_Simpson
(d) Shannon diversity index (H): MAPS_MEAN_Shannon
(e) Simpson diversity index (D): MAPS_MEAN_Simpson
3) The file “3_LiDAR_processing” contents data and R codes to estimate forest structural metrics from ALS-LiDAR data (.las) in an
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