3,514 research outputs found
Observation of Two Resonant Structures in e+e- to pi+ pi- psi(2S) via Initial State Radiation at Belle
The cross section for e+e- to pi+ pi- psi(2S) between threshold and
\sqrt{s}=5.5 GeV is measured using 673 fb^{-1} of data on and off the
\Upsilon(4S) resonance collected with the Belle detector at KEKB. Two resonant
structures are observed in the pi+ pi- psi(2S) invariant mass distribution, one
at 4361\pm 9\pm 9 MeV/c2 with a width of 74\pm 15\pm 10 MeV/c2, and another at
4664\pm 11\pm 5 MeV/c2 with a width of 48\pm 15\pm 3 MeV/c2, if the mass
spectrum is parameterized with the coherent sum of two Breit-Wigner functions.
These values do not match those of any of the known charmonium states.Comment: 10 pages, 5 figures, 2 tables, version to appear in Phys. Rev. Let
Observation of a new D_sJ meson in B+->D0BD0K+ decays
We report the observation of a new meson produced in . This state has a mass of
, a width and a spin-parity. The results are
based on an analysis of 449 million events collected at the
resonance with the Belle detector at the KEKB asymmetric-energy
collider.Comment: submitted to Phys. Rev. Let
Study of time-dependent CP violation in B0 -> J/Psi pi0 decays
We report a measurement of CP asymmetry parameters in the decay B0(B0bar) ->
J/Psi pi0, which is governed by the b->c cbar d transition. The analysis is
based on a 140/fb data sample accumulated at the Upsilon(4S) resonance by the
belle detector at the KEKB asymmetric-energy e+e- collider. We fully
reconstruct one neutral B meson in the J/Psi pi0 final state. The accompanying
B meson flavor is identified by its decay products. From the distribution of
proper time intervals between the two B decays, we obtain the following
CP-violating parameters: S_{J/Psi pi0}=-0.72+-0.42+-0.09 and A_{J/Psi
pi0}=-0.01 +-0.29+-0.03.Comment: 5 pages, 2 figures, submitted to PR
Recommended from our members
Genome-wide trans-ancestry meta-analysis provides insight into the genetic architecture of type 2 diabetes susceptibility.
To further understanding of the genetic basis of type 2 diabetes (T2D) susceptibility, we aggregated published meta-analyses of genome-wide association studies (GWAS), including 26,488 cases and 83,964 controls of European, east Asian, south Asian and Mexican and Mexican American ancestry. We observed a significant excess in the directional consistency of T2D risk alleles across ancestry groups, even at SNPs demonstrating only weak evidence of association. By following up the strongest signals of association from the trans-ethnic meta-analysis in an additional 21,491 cases and 55,647 controls of European ancestry, we identified seven new T2D susceptibility loci. Furthermore, we observed considerable improvements in the fine-mapping resolution of common variant association signals at several T2D susceptibility loci. These observations highlight the benefits of trans-ethnic GWAS for the discovery and characterization of complex trait loci and emphasize an exciting opportunity to extend insight into the genetic architecture and pathogenesis of human diseases across populations of diverse ancestry
Improved Constraints on D0-D0bar Mixing in D0 -> K+ pi- Decays from the Belle Detector
We report the results of a search for D0-D0bar mixing in D0 -> K+ pi- decays
based on 400 fb^{-1} of data accumulated by the Belle detector at KEKB. Both
assuming CP conservation and allowing for CP violation, we fit the decay-time
distribution for the mixing parameters x' and y', as well as for the parameter
R_D, the ratio of doubly-Cabibbo-suppressed decays to Cabibbo-favored decays.
The 95% confidence level region in the (x'^2,y') plane is obtained using a
frequentist method. Assuming CP conservation, we find x'^2<0.72 x 10^{-3} and
-9.9 x 10^{-3}<y'<6.8 x 10^{-3} at the 95% confidence level; these are the most
stringent constraints on the mixing parameters to date. The no-mixing point
(0,0) has a confidence level of 3.9%. Assuming no mixing, we measure
R_D=(0.377+-0.008+-0.005)%.Comment: 6 pages, 3 figures, 1 table; replaced with the version of Phys. Rev.
Let
Evidence for Direct CP Violation in B0 -> K+- pi-+ Decays
We report evidence for direct CP violation in the decay B0 -> K+-pi-+ with
253/fb of data collected with the Belle detector at the KEKB e+e- collider.
Using 275 million B B_bar pairs we observe a B -> K+-pi-+ signal with 2140+-53
events. The measured CP violating asymmetry is Acp(K+-pi-+) = -0.101+-0.025
(stat)+-0.005 (syst), corresponding to a significance of 3.9 sigma including
systematics. We also search for CP violation in the decays B+- -> K+-pi0 and
B+- -> pi+-pi0. The measured CP violating asymmetries are Acp(K+-pi0) =
0.04+-0.05(stat)+-0.02(syst) and Acp(pi+-pi0) = -0.02+-0.10(stat)+-0.01(syst),
corresponding to the intervals -0.05 < Acp(K+-pi0) < 0.13 and
-0.18<Acp(pi+-pi0)<0.14 at 90% confidence level.Comment: 9 pages, 3 figures. submitted to Physical Review Letter
Older Adults and Information and Communication Technologies in the Global North
At all ages, people are incorporating information and communication technologies (ICTs) into their lives. It is not that they have stopped talking with each other in-person, it is that ICTs complement their interactions when they cannot be together face-to-face. Since the 1990s, email has provided a routine way to stay in touch and sustain meaningful contact over distance. But not all age groups have adopted ICTs with the same enthusiasm. Research in the Global North has consistently reported that age plays an important role in ICT adoption and use (Anderson and Perrin 2017). For example, older adults have been the least likely to use ICTs, and even when they do use ICTs, they are less active in their use (Blank and Groselji 2014; Haight, Quan-Haase, and Corbett 2014; Schreurs, Quan-Haase, and Martin 2017). Yet, this is changing. As more older adults use ICTs, analysts are wondering how such ICTs affect older adults’ social networks (Wang, Zhang and Wellman 2018; Wellman, Quan-Haase and Harper forthcoming): Are ICTs helping older adults build, maintain, or diminish personal networks? And how are they supporting or limiting the exchange of social support both for local and long-distance social networks? Moreover, are ICTs affecting different types of social ties differently—be they kin, friend, neighbor, workmate, or churchgoer; or strong or weak
QTL Analysis of Shading Sensitive Related Traits in Maize under Two Shading Treatments
During maize development and reproduction, shading stress is an important abiotic factor influencing grain yield. To elucidate the genetic basis of shading stress in maize, an F2:3 population derived from two inbred lines, Zhong72 and 502, was used to evaluate the performance of six traits under shading treatment and full-light treatment at two locations. The results showed that shading treatment significantly decreased plant height and ear height, reduced stem diameter, delayed day-to-tassel (DTT) and day-to-silk (DTS), and increased anthesis-silking interval (ASI). Forty-three different QTLs were identified for the six measured traits under shading and full light treatment at two locations, including seven QTL for plant height, nine QTL for ear height, six QTL for stem diameter, seven QTL for day-to-tassel, six QTL for day-to-silk, and eight QTL for ASI. Interestingly, three QTLs, qPH4, qEH4a, and qDTT1b were detected under full sunlight and shading treatment at two locations simultaneously, these QTL could be used for selecting elite hybrids with high tolerance to shading and high plant density. And the two QTL, qPH10 and qDTS1a, were only detected under shading treatment at two locations, should be quit for selecting insensitive inbred line in maize breeding procedure by using MAS method
- …