26,300 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
Observations of Bºs→ψ(2S)η and Bº(s)→ψ(2S)π+π- decays
No full textFirst 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
Measurement of b-hadron masses
No full textMeasurements of b-hadron masses are performed with the exclusive decay modes B +→J/ψK +, B 0→J/ψK +, B0→J/ψKS0, Bs0→J/ψφ and Λb0→J/ψΛ using an integrated luminosity of 35pb -1 collected in pp collisions at a centre-of-mass energy of 7 TeV by the LHCb experiment. The momentum scale is calibrated with J/ψ→μ +μ - decays and verified to be known to a relative precision of 2 ×10 -4 using other two-body decays. The results are more precise than previous measurements, particularly in the case of the Bs0 and Λb0 masses
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst 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 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
Acoustical Physics, V. 51, I. 06
No full textAcoustical Physics -- November 2005
Volume 51, Issue 6, pp. 609-722
Active Noise Cancellation of a Spherical Multipole Source Using a Radially Vibrating Spherical Baffled Piston
M. Azarpeyvand
pp. 609-618 Full Text: PDF (336 kB)
Hydroacoustic Coordinate-Measuring System of the NT-200 Baikal Neutrino Telescope
V. M. Ainutdinov, V. A. Balkanov, I. A. Belolaptikov, L. B. Bezrukov, N. M. Budnev, R. V. Vasil'ev, R. Wischnewski, E. A. Vyatchin, O. N. Gaponenko, O. A. Gress, T. I. Gress, I. A. Danil'chenko, Zh-A. M. Dzhilkibaev, A. A. Doroshenko, A. N. D'yachok, G. V. Domogatskii, V. A. Zhukov, V. L. Zurbanov, A. M. Klabukov, A. I. Klimov, S. I. Klimushin, E. O. Kozakov, K. V. Konishchev, A. P. Koshechkin, V. E. Kuznetsov, V. F. Kulepov, L. A. Kuz'michev, Yu. B. Lanin, S. V. Lovtsov, B. K. Lubsandorzhiev, T. Mikolajski, M. B. Milenin, R. R. Mirgazov, S. P. Mikheev, A. V. Moroz, N. I. Moseiko, S. A. Nikiforov, É. A. Osipova, A. I. Panfilov, A. A. Pavlov, G. L. Pan'kov, L. V. Pan'kov, Yu. V. Parfenov[dagger], E. N. Pliskovskii, V. A. Poleshchuk, S. I. Polityko[dagger], E. G. Popova, P. G. Pokhil, V. A. Primin, V. V. Prosin, A. V. Rzhetsichkii, M. I. Rozanov, V. Yu. Rubtsov, Yu. A. Semenei, B. A. Tarashchanskii, S. V. Fialkovskii, A. G. Chenskii, D. V. Chernov, B. A. Shaibonov, Ch. Spiering, and I. V. Yashin
pp. 619-628 Full Text: PDF (118 kB)
Long-Range Sound Propagation in the Northeastern Atlantic
R. A. Vadov
pp. 629-637 Full Text: PDF (146 kB)
Reconstruction of a Dynamic Load Acting on a Viscoelastic Layer
A. O. Vatul'yan, V. M. Dragilev, and L. L. Dragileva
pp. 638-643 Full Text: PDF (84 kB)
Fluctuations of Noiselike Signals Reflected from a Rough Surface at the Output of a Correlation Receiver
E. P. Gulin
pp. 644-652 Full Text: PDF (121 kB)
Characteristics of Biot Waves Produced by a Vibration Exciter in a Fluid-Saturated Medium
Yu. M. Zaslavskii
pp. 653-663 Full Text: PDF (123 kB)
On the Vertical Structure of the Sound Field in a Canonical Waveguide at Long Ranges
V. A. Zverev and G. K. Ivanova
pp. 664-670 Full Text: PDF (103 kB)
Properties of a Magnetic-Fluid Membrane
Yu. Yu. Kameneva, G. V. Karpova, V. V. Kovarda, O. V. Lobova, and V. M. Polunin
pp. 671-679 Full Text: PDF (112 kB)
Heart Sounds as a Result of Acoustic Dipole Radiation of Heart Valves
S. G. Kasoev
pp. 680-687 Full Text: PDF (111 kB)
Deformation of a Homeotropic Nematic Liquid Crystal Layer at Oblique Incidence of an Ultrasonic Wave
E. N. Kozhevnikov
pp. 688-694 Full Text: PDF (91 kB)
Measurement of Acoustic Power in Studying Cavitation Processes
I. M. Margulis and M. A. Margulis
pp. 695-704 Full Text: PDF (172 kB)
Dynamics of a Bubble Cluster in an Acoustic Field
É. Sh. Nasibullaeva and I. Sh. Akhatov
pp. 705-712 Full Text: PDF (117 kB)
The Propagation of a Nonlinear Sound Wave in an Unconsolidated Granular Medium
K. A. Naugolnykh and I. B. Esipov
pp. 713-718 Full Text: PDF (96 kB)
SHORT COMMUNICATIONS
Damping of a Piezoelectric Plate and the Use of an Electric Circuit to Obtain a Short Acoustic Pulse
S. I. Konovalov and A. G. Kuz'menko
pp. 719-722 Full Text: PDF (51 kB)Archived web conten
Spectral properties of Andreev reflection from quantum turbulence in 3He-B: What do they tell about turbulent fluctuations?
No full textOne of the experimental techniques developed to measure quantum turbulence at low temperatures in 3He-B utilizes the Andreev reflection of thermal quasiparticle excitations from quantized vortices and vortex structures. We present the results of theoretical, numerical, and experimental study of Andreev scattering from quantum turbulence in 3He-B. We analyze the spectral properties of the Andreev reflection and compare these with the spectral properties of superfluid turbulence, and discuss the physical mechanisms responsible for the scaling of spectral densities. Finally, we discuss the relation between our findings and related observables in ordinary turbulence
Measurement of the B0–B0 oscillation frequency Δmd with the decays B0→D−π+ and B0→ J/ψK∗0
No full textThe B
0
–B
0
oscillation frequency Δmd is measured by the LHCb experiment using a dataset corresponding
to an integrated luminosity of 1.0 fb−1
of proton–proton collisions at √
s = 7 TeV, and is found to be
Δmd
=0.5156±0.0051 (stat.)±0.0033 (syst.) ps−1
. The measurement is based on results from analyses
of the decays B
0
→ D
−π
+ (D
−
→ K
+π
−π
−) and B
0
→ J/ψK
∗0
(J/ψ →μ
+μ
−,K
∗0
→ K
+π
−) and
their charge conjugated modes
- …
