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CERN Document Server Pronađeno je 2,051 zapisa  1 - 10slijedećikraj  idi na zapis: Pretraživanje je potrajalo 1.03 sekundi 
1.
(100)
Measurement of the Forward-Backward Asymmetry in $Z \to b\overline{b}$ and $Z \to c\overline{c}$ Decays with Leptons / ALEPH Collaboration
The sample of hadronic Z decays collected by the ALEPH detector at LEP in the years 1991-1995 is analysed in order to measure the forward-backward asymmetry in $Z \to b\bar{b}$ and $Z \to c\bar{c}$ events and the $B^0-\bar{B^0}$ average mixing parameter $\bar{\chi}$. Quark charges are tagged by the charges of electrons and muons produced in b and c semileptonic decays. [...]
CERN-EP-2001-097.- Geneva : CERN, 2002 - 25 p. ALEPH Papers - Published in : Eur. Phys. J. C 24 (2002) 177-191 Fulltext: PDF; - CERN library copies
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2.
(91)
Measurements of the Strong Coupling Constant and the QCD Colour Factors using Four-jet Observables from Hadronic Z Decays / ALEPH Collaboration
Data from e+e- annihilation into hadrons, taken with the ALEPH detector at the Z resonance, are analyzed. The four-jet rate is studied as a function of the resolution parameter and compared to next-to-leading order calculations combined with resummation of large logarithms. [...]
CERN-EP-2002-029.- Geneva : CERN, 2003 - 32 p. ALEPH Papers - Published in : Eur. Phys. J. C 27 (2003) 1-17 Fulltext: ep-2002-029_plot_contour_gluino_new - PS.GZ; ep-2002-029_fit_cosks - PS.GZ; ep-2002-029_fit_cosbz - PS.GZ; ep-2002-029_plot_contour - PS.GZ; ep-2002-029_plot_total_corr - PS.GZ; ep-2002-029_fit_cosnr - PS.GZ; ep-2002-029_plot_total_corr_r4 - PS.GZ; ep-2002-029_plot_full_vs_data - PS.GZ; ep-2002-029 - PDF; ep-2002-029_syst_contour - PS.GZ; ep-2002-029_plot_alphas_xmu_fit - PS.GZ; ep-2002-029_fit_r4 - PS.GZ; ep-2002-029_fit_cos34 - PS.GZ; ep-2002-029_plot_alphas_fit - PS.GZ; ep-2002-029_xmu_scan - PS.GZ; - CERN library copies
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3.
(88)
Production of excited beauty states in Z decays / ALEPH Collaboration
A data sample of about 3.0 million hadronic Z decays collected by the ALEPH experiment at LEP in the years 1991 through 1994, is used to make an inclusive selection of B~hadron events. In this event sample 4227 \pm 140 \pm 252 B^* mesons in the decay B^* \to B \gamma and 1944 \pm 108 \pm 161 B^{**} mesons decaying into a B~meson and a charged pion are reconstructed. [...]
CERN-PPE-95-108; FSU-SCRI-96-16.- Geneva : CERN, 1996 - 24 p. ALEPH Papers - Published in : Z. Phys. C 69 (1996) 393-404 Fulltext: PDF; - CERN library copies
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4.
(80)
Measurement of the mass of the $\Lambda_{b}$ baryon / ALEPH Collaboration
In a data sample of four million hadronic \Z\ decays collected with the ALEPH detector at LEP, four $\Lambda_b$ baryon candidates are exclusively reconstructed in the $\Lambda_b \rightarrow \Lambda_c^+ \pi^-$ channel, with the $\Lambda_c^+$ decaying into $pK^-\pi^+$, $p\bar{K^0}$, or $\Lambda\pi^+\pi^+\pi^-$. The probability of the observed signal to be due to a background fluctuation is estimated to be $4.2 \times 10^{-4}$. [...]
CERN-PPE-96-028; FSU-SCRI-96-118.- Geneva : CERN, 1996 - 11 p. ALEPH Papers - Published in : Phys. Lett. B 380 (1996) 442-452 Fulltext: PDF; - CERN library copies
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5.
(77)
A measurement of the gluon splitting rate into $b\overline{b}$ pairs in hadronic Z decays / ALEPH Collaboration
A measurement of the fraction of hadronic Z decays in which a gluon splits into a $b \bar{b}$ pair, \gbb, is presented using data collected by {\t extsc ALEPH} from 1992 to 1995 at the Z resonance. The selection is based on four-jet events. [...]
CERN-EP-98-103.- Geneva : CERN, 1998 - 15 p. ALEPH Papers - Published in : Phys. Lett. B 434 (1998) 437 Fulltext: PDF; - CERN library copies
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6.
(77)
Measurement of the W mass in $e^+ e^-$ collisions at 183 GeV / ALEPH Collaboration
The mass of the W boson is obtained from reconstructed invariant mass distributions in W-pair events. The sample of W pairs is selected from 57 pb$^{-1}$ collected with the ALEPH detector in 1997 at a centre-of-mass energy of 183 GeV. [...]
CERN-EP-99-027.- Geneva : CERN, 1999 - 21 p. ALEPH Papers - Published in : Phys. Lett. B 453 (1999) 121-137 Fulltext: PDF; - CERN library copies
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7.
(75)
Measurement of the transverse spin correlations in the decay $Z \rightarrow \tau^+\tau^-$ / ALEPH Collaboration
For tau leptons produced in e^+e^- -> tau^+ tau^- interactions there are, in addition to the longitudinal spin correlations, two independent transverse spin correlations associated with the transverse (within the production plane) and normal (to the production plane) polarization components. A measurement of the transverse-transverse and transverse-normal tau spin correlations in the decay Z -> tau^+ tau^-, C_{TT} and C_{TN}, is presented based on the aplanarity angle of the decay products of both tau leptons. [...]
CERN-PPE-97-047.- Geneva : CERN, 1997 - 14 p. ALEPH Papers - Published in : Phys. Lett. B 405 (1997) 191-201 Fulltext: PDF; - CERN library copies
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8.
(72)
Resonant structure and flavour tagging in the $B\pi^{\pm}$ system using fully reconstructed $B$ decays / ALEPH Collaboration
Starting from a sample of four million hadronic $Z$ decays collected with the ALEPH detector at LEP, 404 charged and neutral $B$ mesons are fully reconstructed and used to look for resonant structure in the $B\pi$ system. An excess of events is observed above the expected background in the $B\pi$ mass spectrum at a mass $\approx 5.7$ GeV/c$^2$, consistent with the production and decay to $B^{(*)}\pi$ of the $B^{**}$ states predicted by Heavy Quark Symmetry (HQS). [...]
CERN-EP-98-017; FSU-SCRI-98-76.- Tallahassee, FL : Florida State Univ., 1998 - 13 p. ALEPH Papers - Published in : Phys. Lett. B 425 (1998) 215 Fulltext: PDF;
In : 28th International Conference on High-energy Physics, Warsaw, Poland, 25 - 31 Jul 1996, pp.PA01-070 - CERN library copies
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9.
(71)
Measurement of $\Lambda$ polarization from Z decays / ALEPH Collaboration
The polarization of \Lambda baryons from Z decays is studied with the {\sc Aleph} apparatus. Evidence of longitudinal polarization of s quarks from Z decay is observed for the first time [...]
CERN-PPE-96-004; FSU-SCRI-96-104.- Geneva : CERN, 1996 - 16 p. ALEPH Papers - Published in : Phys. Lett. B 374 (1996) 319-330 Fulltext: PDF;
In : 28th International Conference on High-energy Physics, Warsaw, Poland, 25 - 31 Jul 1996, pp.PA01-072 - CERN library copies
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10.
(71)
A study of the decay width difference in the $B^{0}_{s}-\overline{B}^{0}_{s}$ system using $\phi\phi$ correlations / ALEPH Collaboration
In a data sample of about four million hadronic Z decays recorded with the ALEPH detector from 1991 to 1995, the $B^{0}_{s} \to D^{(*)+}_{s}D^{(*)-}_{s}$ decay is observed, based on tagging the nal state with two $\phi$ mesons in the same hemisphere. The $D^{(*)+}_{s}D^{(*)-} _{s}$ final state is mostly CP even and corresponds to the short-lived $B^0$ mass eigenstate. [...]
CERN-EP-2000-036.- Geneva : CERN, 2000 - 20 p. ALEPH Papers - Published in : Phys. Lett. B 486 (2000) 286-99 Fulltext: ep-2000-036_version1 - PDF; ep-2000-036 - PDF; External link: Published version
In : 30th International Conference on High-energy Physics, Osaka, Japan, 27 Jul - 2 Aug 2000, pp.e-page 137 - CERN library copies
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