54,836 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
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
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
FIGURE. Pollen morphology of S. glandulata and S. lupulina observed under SEM. A–C. Strobilanthes lupulina. A: Equatorial view, B, C: Exine ornamentation. D–F. Strobilanthes glandulata. D: Equatorial view, E, F: Exine ornamentation. in Strobilanthes glandulata (Acanthaceae), a new species from Sri Lanka based on the morphological and molecular evidences
No full textFIGURE. Pollen morphology of S. glandulata and S. lupulina observed under SEM. A–C. Strobilanthes lupulina. A: Equatorial view, B, C: Exine ornamentation. D–F. Strobilanthes glandulata. D: Equatorial view, E, F: Exine ornamentation.Published as part of Nilanthi, Rajapakse Mudiyanselage Renuka, Samarakoon, Hiruna, Jayawardana, Nuwan, Hathurusinghe, Bhagya, Wijesundara, Siril & Bandaranayake, Pradeepa Chandani Gunathilake, 2022, Strobilanthes glandulata (Acanthaceae), a new species from Sri Lanka based on the morphological and molecular evidences, pp. 1-14 in Phytotaxa 573 (1) on page 4, DOI: 10.11646/phytotaxa.573.1.1, http://zenodo.org/record/732940
FIGURE 2 in The taxonomy and phylogeny of Austropleospora ochracea sp. nov. (Didymosphaeriaceae) from Guizhou, China
No full textFIGURE 2. Austropleospora ochracea (HMAS 248367, holotype). a, b. Ascomata on host substrate, c, d. Vertical sections of ascomata, e. Peridium, f. Pseudoparaphyses, g−j. Asci, k−n. Ascospores, o. Germinating ascospore, p. Culture on PDA from above. Scale bars: c, d = 100 µm, e = 10 µm, f = 4 µm, g−j = 20 µm, k−o = 5 µm.Published as part of Dissanayake, Lakmali S., Wijayawardene, Nalin N., Samarakoon, Milan C., Hyde, Kevin D. & Kang, Ji-Chuan, 2021, The taxonomy and phylogeny of Austropleospora ochracea sp. nov. (Didymosphaeriaceae) from Guizhou, China, pp. 217-229 in Phytotaxa 491 (3) on page 222, DOI: 10.11646/phytotaxa.491.3.2, http://zenodo.org/record/575573
Search for B-c(+) decays to two charm mesons
No full textA search for decays of B-c(+) mesons to two charm mesons is performed for the first time using data corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. The decays considered are B-c(+)-> D-(s)(()*())(+) (D) over bar (()*()0) and Bc(+)-> D-(s)(()*D-)+(()*())(0), which are normalised to high-yield B+-> D-(s)(+)(D) over bar (0)decays. No evidence for a signal is found and limits are set on twelve B-c(+) decay modes. (C) 2018 The Author(s). Published by Elsevier B.V
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
Measurement of the CKM angle gamma from a combination of B->Dh analyses
No full textA combination of three LHCb measurements of the CKM angle gamma is presented. The decays B->DK and B->Dpi are used, where D denotes an admixture of D0 and D0-bar mesons, decaying into K+K-, pi+pi-, K+-pi-+, K+-pi-+pi+-pi-+, KSpi+pi-, or KSK+K- final states. All measurements use a dataset corresponding to 1.0 fb-1 of integrated luminosity. Combining results from B->DK decays alone a best-fit value of gamma = 72.0 deg is found, and confidence intervals are set gamma in [56.4,86.7] deg at 68% CL, gamma in [42.6,99.6] deg at 95% CL. The best-fit value of gamma found from a combination of results from B->Dpi decays alone, is gamma = 18.9 deg, and the confidence intervals gamma in [7.4,99.2] deg or [167.9,176.4] deg at 68% CL, are set, without constraint at 95% CL. The combination of results from B->DK and B->Dpi decays gives a best-fit value of gamma = 72.6 deg and the confidence intervals gamma in [55.4,82.3] deg at 68% CL, gamma in [40.2,92.7] deg at 95% CL are set. All values are expressed modulo 180 deg, and are obtained taking into account the effect of D0-D0bar mixing
FIGURE 3 in Massaria broussonetiae sp. nov. and M. racemosae sp. nov. (Massariaceae, Pleosporales) on moraceous hosts
No full textFIGURE 3. Massaria racemosae (holotype, MFLU 19–2135) a Substrate. b, c Ascomata on substrate. d Vertical section of an ascoma. e Peridium. f Paraphyses. g–l Asci (l in Congo Red). m–t Ascospores (s in Congo Red, t in Indian ink). Scale bars: a = 1 cm, b = 1000 µm, c = 500 µm, d = 200 µm, g–l = 50 µm, e, m–s = 20 µm, f = 5 µm.Published as part of Samarakoon, Milan C., Liu, Jian-Kui, Karunarathna, Samantha C., Mukjang, Nilita & Cheewangkoon, Ratchadawan, 2022, Massaria broussonetiae sp. nov. and M. racemosae sp. nov. (Massariaceae, Pleosporales) on moraceous hosts, pp. 263-274 in Phytotaxa 559 (3) on page 269, DOI: 10.11646/phytotaxa.559.3.4, http://zenodo.org/record/702174
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