8,594 research outputs found
Contributions to the width difference in the neutral system from hadronic decays
Recent studies of several multi-body meson decays have revealed that
the final states are dominantly -even. However, the small value of the
width difference between the two physical eigenstates of the
- system indicates that the total widths of decays to
-even and -odd final states should be the same to within about a
percent. The known contributions to the width difference from hadronic
decays are discussed, and it is shown that an apparent excess of
quasi--even modes is balanced, within current uncertainty, by interference
effects in quasi-flavour-specific decays. Decay modes which may significantly
affect the picture with improved measurements are considered.Comment: 17 pages including 3 tables. v2: Updated with published version
including new comments in summar
Arithmetic correlations over large finite fields
The auto-correlations of arithmetic functions, such as the von Mangoldt
function, the M\"obius function and the divisor function, are the subject of
classical problems in analytic number theory. The function field analogues of
these problems have recently been resolved in the limit of large finite field
size . However, in this limit the correlations disappear: the arithmetic
functions become uncorrelated. We compute averages of terms of lower order in
which detect correlations. Our results show that there is considerable
cancellation in the averaging and have implications for the rate at which
correlations disappear when ; in particular one cannot
expect remainder terms that are of the order of the square-root of the main
term in this context.Comment: The paper has been accepted by IMR
Alien Registration- Geller, Gershon J. (Portland, Cumberland County)
https://digitalmaine.com/alien_docs/23194/thumbnail.jp
The determinants of farm investment and residential construction in post-reform China
The objective of this paper is to clarify, on the basis of detailed farm level data derived from recent surveys,the importance of factors related to tenure security, farm size and credit availability in constraining farmers'agricultural investment. In particular, a direct measure of farmers'perceptions regarding tenure security will be utilized, as well as information on transactions in the credit market. The next section provides a description of the study areas. It is followed by a discussion of factors affecting farm investment and a description of investment patterns in the study areas. A formal model of farmers'consumption and investment decisions, and an econometric analysis are then presented and results are interpreted. The last section summarizes the paper.Environmental Economics&Policies,Economic Theory&Research,Banks&Banking Reform,International Terrorism&Counterterrorism,Agricultural Knowledge&Information Systems
Credit's effect on productivity in Chinese agriculture : a microeconomic model of disequilibrium
Many government programs want to provide more credit to the farm sector to increase agricultural productivity. If the marginal effect on productivity is small, those resources might be put to better use elsewhere. The authors conducted an econometric analysis of the effect of credit on output supply which recognizies that credit markets are not necessarily at equilibrium - so that credit rationing and nonborrowing are both possible. Only about 37 percent of the farmers in the study area were constrained by inadequate formal credit. Informal credit sources provided funds for specific non-agricultural activities that were not fungible. The results indicate that one additional yuan of liquidity yielded 0.235 yuan of additional gross value of output. These results suggest that for the area of China covered in the study, a good part of the short-term credit may actually be used for consumption and investment. Two conclusions are suggested for evaluating the probable effect of expanding agricultural credit. First, not all farmers, and sometimes only a minority, are constrained in their farming operations by inadequate credit. And second, greater supplies of formal credit will be diverted in part to consumption, so the likely effect on output will be smaller than what one might expect if all funds are assumed to be used productively.Banks&Banking Reform,Financial Intermediation,International Terrorism&Counterterrorism,Economic Theory&Research,Environmental Economics&Policies
Observation of the rare decay B+ -> K+π0π0 and measurement of the quasi-two-body contributions B+ -> K*(892)+π0, B+ -> f0(980)K+, and B+ -> χc0K+
We report an analysis of charmless hadronic decays of charged B mesons to the final state K(+) pi(0)pi(0), using a data sample of (470.9 +/- 2.8) x 10(6) B (B) over bar events collected with the BABAR detector at the Y(4S) resonance. We observe an excess of signal events, with a significance above 10 standard deviations including systematic uncertainties, and measure the branching fraction and CP asymmetry to be B(B(+) -> K(+) pi(0)pi(0)) = (16.2 +/- 1.2 +/- 1.5) x 10(-6) and A(CP)(B(+) -> K(+) pi(0)pi(0)) = -0.06 +/- 0.06 +/- 0.04, where the uncertainties are statistical and systematic, respectively. Additionally, we study the contributions of the B(+) -> K*(892)(+) pi(0), B(+) -> f(0)(980)K(+), and B(+) -> chi(c0)K(+) quasi-two-body decays. We report the world's best measurements of the branching fraction and CP asymmetry of the B(+) -> K(+) pi(0)pi(0) and B(+) -> K(+)(892)(+) pi(0) channels
An Examination of the Challenges Experienced by Canadian Ice-Hockey Players in the National Hockey League
Semistructured interviews were used in this study to learn about the challenges experienced by four groups of National Hockey League (NHL) players (N=11): prospects (n=3), rookies (n=3), veterans (n=2), and retirees (n=3). The database is comprised of 757 meaning units grouped into 11 contextual challenges pertaining to scouting demands, training camp, increased athletic demands, team expectations, and earning team trust. The veterans spoke mostly of challenges including scouting demands, athletic demands, and team expectations. Retirees considered mostly challenges pertaining to team expectations, athletic demands, lifestyle, media demands, transactions, cross-cultural encounters, and playoffs. An expert panel ensured that the interview guide, data analysis, and the findings represented the participants’ experiences in the NHL. Recommendations for practitioners and researchers working with NHL players are proposed
- …