5,042 research outputs found
Observations of Bºs→ψ(2S)η and Bº(s)→ψ(2S)π+π- decays
Full text linkFirst 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 the CP-violating phase \phi s in Bs->J/\psi\pi+\pi- decays
Full text linkMeasurement of the mixing-induced CP-violating phase phi_s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/\psi pi+ pi- are selected in 1/fb of pp collision data collected at sqrt{s} = 7 TeV with the LHCb detector. A time-dependent fit to the data yields a value of phi_s=-0.019^{+0.173+0.004}_{-0.174-0.003} rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found
Measurement of the inclusive φ cross-section in pp collisions at √s=7 TeV
Full text linkThe 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
MAGNETIC MOLECULES IN MATRICES
No full textW. Weltner, Jr., R.J. Van Zee, and S. Li. J. Phys. Chem. 99, 6277 (1995). Y.M. Hamrick and W. Weltner, Jr.,. J. Chem. Phys. 94 3371 (1991). R.J. Van Zee and W. Weltner, Jr., Chem. Phys. Lett (accepted). S. Li, H.A. Weimer, R.J. Van Zee, and W. Weltner, Jr., J. Chem. Phys. (accepted)Author Institution: Department of Chemistry, University of FloridaMagneto-infrared and electron-skip-resonance (ESR) spectroscopies have been applied to trapped molecules and ions hin rare-gas matrices. Topics to be discussed may include zero-field quenching of orbital angular and phonon $effects.^{d}
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
Full text linkAn 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
Author Index- Social and Technical Issues in Testing: Implications for Test Construction and Usage
Full text linkAuthor Index pp. 173-178
A-Z (6 pages)
Numbers in italics indicate pages with complete bibliographic information.
A Acker, S. R., 65 , 86 Ackoff, R. L. , 21, 35 Adair, F. L., 122, 125 Adkins, D. c. , 148 , 153 Aisner, D. J ., 32, 35 Alderman, D. L. , 148 , 153 Anastas i, A., 9 1, 99, 107, 129 , 130, 132, 134, 139, 164 , 168 , 169 Anderson, G. E. , Jr. , 2 1, 35 Anderson , 1. R. , 46 , 57 Anderson, R. C. , 142, 153, 157, 169 Arnoff, S. L., 2 1, 35 Ausubel, D. P., 165, 169
...
Z
Zedeck, S., 72, 86Ziskin , J. , 96, 10
Author Index- Social and Technical Issues in Testing: Implications for Test Construction and Usage
Full text linkAuthor Index pp. 173-178
A-Z (6 pages)
Numbers in italics indicate pages with complete bibliographic information.
A Acker, S. R., 65 , 86 Ackoff, R. L. , 21, 35 Adair, F. L., 122, 125 Adkins, D. c. , 148 , 153 Aisner, D. J ., 32, 35 Alderman, D. L. , 148 , 153 Anastas i, A., 9 1, 99, 107, 129 , 130, 132, 134, 139, 164 , 168 , 169 Anderson, G. E. , Jr. , 2 1, 35 Anderson , 1. R. , 46 , 57 Anderson, R. C. , 142, 153, 157, 169 Arnoff, S. L., 2 1, 35 Ausubel, D. P., 165, 169
...
Z
Zedeck, S., 72, 86Ziskin , J. , 96, 10
First observation of Bs → J/ψf0(980) decays
Full text linkUsing data collected with the LHCb detector in proton–proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decay is observed. This CP eigenstate mode could be used to measure mixing-induced CP violation in the system. Using a fit to the π+π− mass spectrum with interfering resonances gives . In the interval ±90 MeV around 980 MeV, corresponding to approximately two full f0 widths we also find , where in both cases the uncertainties are statistical and systematic, respectively
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