68,273 research outputs found
Drepanoistodus stougei Rasmussen 1991
No full textDrepanoistodus stougei Rasmussen, 1991 Fig. 6R–S Material examined 22 geniculate elements including 17 from the Lynna section. Remarks Drepanoistodus stougei was first described by Rasmussen (1991) and further morphological details for all the four element types were subsequently added by Rasmussen (2001). The most distinct features are the rounded anterior margin and the relatively long upper margin on the base. In the material at hand, the b/c ratio (see Fig. 3) mean is 0.50 and angle A has a mean of 27.4°. In some cases, D. svendi sp. nov. is characterized by a similarly rounded anterior margin but is distinguished by its (weakly) curved cusp and carina. Drepanoistodus aff. basiovalis morphotypes with a rounded anterior margin are separated from D. stougei by the characteristically extended keel in the upper anterior corner of the former taxon. Because D. stougei is included here just for comparison with the new species described, synonymy or further descriptive details have not been incorporated, but can be found in Rasmussen (1991, 2001). Occurrence From the Lenodus antivariabilis Zone (sample LY12-5) to the basal part of the interzone (“uncertain interval”; sample LY12-29) between the L. variabilis Zone and the Y. crassus Zone sensu Lindskog et al. (2020) in the Lynna River section.Published as part of Rasmussen, Jan Audun, Eriksson, Mats E. & Lindskog, Anders, 2021, Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species, pp. 106-134 in European Journal of Taxonomy 774 on page 126, DOI: 10.5852/ejt.2021.774.1533, http://zenodo.org/record/555714
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
Get PDFAn 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
Observations of Bºs→ψ(2S)η and Bº(s)→ψ(2S)π+π- decays
Get PDFFirst observations of the B0s
→ψ(2S)η, B0 →ψ(2S)π
+
π
− and B0s
→ψ(2S)π
+
π
− decays are made
using a dataset corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in
proton–proton collisions at a centre-of-mass energy of
√
s = 7 TeV. The ratios of the branching fractions
of each of the ψ(2S) modes with respect to the corresponding J/ψ decays are
B(B0s
→ψ(2S)η)
÷
B(B0s
→J/ψη)
= 0.83± 0.14 (stat)±0.12 (syst) ±0.02 (B),
;
B(B0→ψ(2S)π
+
π
−
)
÷
B(B0→J/ψπ
+
π
−
)
= 0.56± 0.07 (stat)±0.05 (syst)± 0.01 (B),
;
B(B0s
→ψ(2S)π
+
π
−
)
÷
B(B0s
→J/ψπ
+
π
−
)
= 0.34± 0.04 (stat)±0.03 (syst)± 0.01 (B),
where the third uncertainty corresponds to the uncertainties of the dilepton branching fractions of the J/ψ
and ψ(2S) meson decays
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDFThe 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
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
Get PDFFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Measurement of the branching fraction
Get PDFThe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Hydroptila ebroensis Harris & Rasmussen & Denson 2012, sp. n.
No full textHydroptila ebroensis sp. n. (Fig. 7) Diagnosis. This new species appears most similar to H. morsei Sykora and Harris and other members of the H. strepha Group. It differs in the flared lateral aspect of the tenth tergum and the shape of the inferior appendages in ventral aspect. Description, male. Length 2.5-2.8 mm. 30 antennal segments. Brown in alcohol. Abdominal segment VII annular with short posteroventral process. Segment VIII annular. Segment IX rounded anteriorly in lateral view, deeply incised on posterodorsal margin; in dorsal and ventral view with deep lateral incisions posteriorly, deep mesal incision anteriorly. Segment X in lateral view rectangular, narrowing posteroventrally, thin median process from dorsum; dorsally trilobed, lateral lobes acute flaring outward to acute apices, mesal lobe short and tubular. Inferior appendages in lateral aspect widening distally from narrow base; in ventral view, narrow basally and widely separated, bearing elongate lateral seta, gradually widening posteriorly and turned outward at pointed apices. Subgenital plate in lateral view narrow and sinuate, sclerotized on dorsal margin; in ventral view triangular, narrow point mesally and bearing pair of stout setae. Phallus with basal section elongate, narrowing subapically, apical section elongate, wide basally narrowing distally and curving; ejaculatory duct thin, and slightly longer than phallic shaft; short paramere encircling shaft below juncture of apical and basal sections of phallus. Material examined. Holotype, male. FLORIDA: Bay Co., Little Crooked Creek at SR-79, 1.5 mi S Ebro, Pine Log State Forest, N30 o 24'48" W85 o 52'04", 11 May 2007, A. Rasmussen (NMNH). Paratypes. FLORIDA: same locality and date, 3 males (NMNH); Liberty Co., Gregory Mill Creek at CR-379, Apalachicola National Forest, N30 o 10'26" W85 o 04'04", 16 May 2006, R. Flowers, A. Rasmussen, and B. Richard, 1 male (FAMU); Santa Rosa Co., Thomas Creek at Molino Bridge Road, N30 o 43'50" W87 o 16'21", 13 June 2007, A. Rasmussen and D. Ray, 1 male (INHS); Washington Co., Pine Log Creek at SR-79, Pine Log State Forest, N30 o 25'07" W85 o 52'21", 11 May 2007, A. Rasmussen, 20 males (INHS, FAMU). Etymology. Named for the town of Ebro, Florida located near the type locality.Published as part of Harris, Steven C., Rasmussen, Andrew K. & Denson, Dana R., 2012, An annotated list of the caddisflies (Trichoptera) of Florida: Part I. The family Hydroptilidae, with descriptions of five new species, pp. 1-32 in Insecta Mundi 2012 (273) on page 4, DOI: 10.5281/zenodo.517568
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