136,086 research outputs found
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
Prompt charm production in pp collisions at √<span style="text-decoration:overline">s</span>=7 TeV
No full textCharm production at the LHC in pp collisions at s√=7 TeV is studied with the LHCb detector. The decays D0→K−π+, D+→K−π+π+, D⁎+→D0(K−π+)π+, D+s→ϕ(K−K+)π+, Λ+c→pK−π+, and their charge conjugates are analysed in a data set corresponding to an integrated luminosity of 15 nb−1. Differential cross-sections dσ/dpT are measured for prompt production of the five charmed hadron species in bins of transverse momentum and rapidity in the region 0<pT<8 GeV/c and 2.0<y<4.5. Theoretical predictions are compared to the measured differential cross-sections. The integrated cross-sections of the charm hadrons are computed in the above pT-y range, and their ratios are reported. A combination of the five integrated cross-section measurements gives
σ(cc¯)pT<8 GeV/c,2.0<y<4.5=1419±12(stat)±116(syst)±65(frag) μb,
where the uncertainties are statistical, systematic, and due to the fragmentation functions
Philip Smith and Santiago Rodriguez, Preliminaries Phase I, 6th Van Cliburn Competition (1981)
No full textPolonaise-Fantaisie in A-flat major, op. 61 / Chopin (PARTIAL) ; Piano sonata in C minor, Hob. XVI:20. Andante con moto / Haydn ; Piano sonata in C minor, Hob. XVI:20. Finale: Allegro / Haydn ; Études-tableaux, op. 39. No. 9 in D major / Rachmaninoff (Smith) -- Piano sonata in B minor, Hob. XVI:32. Allegro moderato / Haydn ; Piano sonata in B minor, Hob. XVI:32. Minuet / Haydn ; Keyboard partita no. 2 in C minor, BWV 826. Sinfonia / J. S. Bach (Rodriguez)
Philip Smith and Santiago Rodriguez, Preliminaries Phase II, 6th Van Cliburn Competition (1981)
No full textTranscendental etudes, S. 139. No. 11 in D-flat major, Harmonies du soir / Liszt (PARTIAL) ; Gaspard de la nuit, M. 55. Scarbo / Ravel (Schub) -- Piano sonata no. 14 in C minor, K. 457. Molto allegro / Mozart ; Variations on a theme of Paganini, op. 35. Book I / Brahms (Rodriguez
Beatificación equivalente de S. Bernardino de Feltro... en ocurrencia de la gran solemnidad de la canonización de Santa Margarita de Cortona y beatificación... del... martyr africano San Juan de Prado, a quien se consagra... el siguiente sermon
No full textSign.: ¶-3¶\p4\s, A-C\p4\sPort. con orla ti
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
Analysis, Modelling and Design of an Indoor Positioning System for biomedical applications
No full textThe indoor positioning systems (IPS) became very attractive in a recent past, because they can be used in more applications and in different scenarios. In fact, the use of an indoor positioning system allows to provide location-based services (LBS), e.g., safety information, indoor navigation, location-based advertisements and so on. Moreover, the IPS can be exploited in medical surgery applications where it is required a very precise and accurate position estimation. For example, in radiotherapy systems, the treatment zone must be localized with a sub-mm precision to focus the radiation beam in the precise body area and so limit the damages to the healthy.
In this thesis a novel solution is proposed to evaluate the position of an active target placed in harsh indoor environments. The proposed solution exploits a GPS-like scheme composed by a single transmitter and four synchronized receivers. One of them is selected as system origin and the position are evaluated computing the Time Difference of Arrival of the received signals.
The hardware of each nodes is based on the Software-Defined Radio architecture to obtain a scalable and feasible positioning system able to adapt its characteristics as function of the design specifications. Moreover, it requires simple software instructions to change the properties of the transmit signal, whereas the analog blocks can be designed to cover a wide frequencies range. Hence, the target positions are evaluated in digital domain by means of a signal processing algorithm that can be implemented by a FPGA or a DSP.
The transmit signal combines the properties of well-known Zadoff-Chu sequences with the characteristics of the OFDM modulation scheme to obtain a signal very robust against the multipath. The sense signal is composed by only pilot subcarriers that represent a specific coefficient of the Zadoff-Chu sequence
Measurement of the inclusive φ cross-section in pp collisions at √s=7 TeV
No full textThe cross-section for inclusive φ meson production in pp collisions at a centre-of-mass energy of √s = 7 TeV has been measured with the LHCb detector at the Large Hadron Collider. The differential cross-section is measured as a function of the φ transverse momentum pT and rapidity y in the region 0.6< pT <5.0 GeV/c and 2.44< y <4.06. The cross-section for inclusive φ production in this kinematic range is σ(pp→φX)=1758±19(stat) +43−14(syst)±182(scale) μb, where the first systematic uncertainty depends on the pT and y region and the second is related to the overall scale. Predictions based on the Pythia 6.4 generator underestimate the cross-section
Typing dinucleotide repeats under nondenaturing conditions with single-base resolution and high sizing precision
No full textDinucleotide repeats are genetic markers that are useful for many purposes, including genetic epidemiology, population genetics, and genetic diagnostics. The accuracy of analyses based on dinucleotide repeat polymorphisms is highly dependent on the success achieved in minimizing genotyping errors. Genotyping errors in dinucleotide repeat typing may arise for various reasons, including polymerase chain reaction (PCR) processing errors and the use of unsuitable electrophoretic conditions for resolving amplification products (i.e., lack of single-base resolution and inadequate precision in allele sizing). We have recently described a nondenaturing electrophoretic system useful for detecting PCR processing errors that lead to misidentification of heterozygotes as homozygotes in (AC)n repeat typing. Here, we show that this system also allows resolution of (AC)n repeats in native conditions with single-base resolution and high sizing precision, on the basis of an analysis of seven human (AC)n repeats ranging in size from 72 to 217 bp. This PAGE system is thus also useful for reducing the likelihood both of allele misidentification due to the absence of single-base resolution and of inaccuracies in allele sizing due to anomalous electrophoretic migrations among the alleles within an (AC)nrepeat
Philip Smith and Santiago Rodriguez, Preliminaries Phase II, 6th Van Cliburn Competition (1981)
No full textTranscendental etudes, S. 139. No. 11 in D-flat major, Harmonies du soir / Liszt (PARTIAL) ; Gaspard de la nuit, M. 55. Scarbo / Ravel (Schub) -- Piano sonata no. 14 in C minor, K. 457. Molto allegro / Mozart ; Variations on a theme of Paganini, op. 35. Book I / Brahms (Rodriguez
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