Results
author = "Henrard, P."
Inclusive Measurement of the Charmless Semileptonic Branching Ratio of B-hadrons
Description :
From the study of the kinematics properties of the final state produced in the semileptonic $\mathrm{B}$ decays $\mathrm{B\to \ell\nu_{\ell} X}$, the inclusive charmless semileptonic branching ratio of $\mathrm{B}$-hadrons has been measured. Using the data collected between 1992 and 1995, one gets: ...
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Measurement of the $|V_{ub}|$ matrix element at LEP.
Description :
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Study of multianode photomultipliers for the electomagnetic calorimeter preshower read out of the LHCb experiment
Author(s) :
Ajaltouni, Z.
,
Bohner, G.
,
Carloganu, C.
,
Cornat, R.
,
Crouau, M.
,
Deschamps, O.
,
Henrard, P.
,
Lecoq, J.
,
Lefevre, R.
Description :
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A study of the decay width difference in the $B^{0}_{s}-\overline{B}^{ 0}_{s}$ system using $\phi\phi$ correlations
Author(s) :
Barate, R.
,
Decamp, D.
,
Ghez, P.
,
Goy, C.
,
Lees, J P.
,
Merle, E.
,
Minard, M N.
,
Pietrzyk, B.
,
Alemany, R.
,
Bravo, S.
,
Casado, M P.
Description :
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 mo...
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Study of the CP asymmetry of B$^{0} \rightarrow$ J/$\psi$K$^{0}_{s}$ decays in ALEPH
Author(s) :
Barate, R.
,
Decamp, D.
,
Ghez, P.
,
Goy, C.
,
Merle, E.
,
Pietrzyk, B.
,
Bravo, S.
,
Casado, M P.
,
Chmeissani, M.
,
Crespo, J M.
Description :
The decay B0 -> J/psi K0_S is reconstructed with J/psi -> e+ e- or mu+ mu- and K0_S -> pi+ pi-. From the full ALEPH dataset at LEP1 of about 4 million hadronic Z decays, 23 candidates are selected with an estimated purity of 71%. They are used to measure the CP asymmetry of this decay, given by sin ...
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Measurements of $BR(b \to \tau ^{-}\overline{\nu}_{\tau}X)$ and $BR(b \to \tau ^{-}\overline{\nu}_{\tau} D^{*\pm}X)$ and Upper Limits on $BR(B^{-} \to \tau^{-}\overline{\nu}_\tau)$ and $BR(b \to s\nu\overline{\nu})$
Author(s) :
Barate, R.
,
Decamp, D.
,
Ghez, P.
,
Goy, C.
,
Lees, J P.
,
Merle, E.
,
Minard, M N.
,
Perrodo, P.
,
Pietrzyk, B.
,
Bravo, S.
,
Casado, M P.
Description :
Inclusive branching ratios involving b to tau transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio b -> tau nu X and the semi-inclusive branching ratio b -> tau nu D*+/- X are measured to be (2.43 +/- 0.2...
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Investigation of Inclusive CP Asymmetries in B$^{0}$ Decays
Author(s) :
Barate, R.
,
Decamp, D.
,
Ghez, P.
,
Goy, C.
,
Lees, J P.
,
Merle, E.
,
Minard, M N.
,
Pietrzyk, B.
,
Bravo, S.
,
Casado, M P.
,
Chmeissani, M.
Description :
A search for CP violating effects in the mixing of neutral B mesons is performed using a sample of 4.1 million hadronic Z decays collected with the ALEPH detector from 1991 to 1995. By studying time-dependent asymmetries in flavour-tagged samples of semileptonic and fully inclusive b-hadron decays, ...
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Measurement of the Tau polarisation at LEP
Author(s) :
Heister, A.
,
Schael, S.
,
Barate, R.
,
De Bonis, I.
,
Decamp, D.
,
Ghez, P.
,
Goy, C.
,
Lees, J P.
,
Merle, E.
,
Minard, M N.
,
Pietrzyk, B.
Description :
The polarisation of $\tau$'s produced in Z decay is measured using 160 pb$^{-1}$ of data accumulated at LEP by the ALEPH detector between 1990 and 1995. The variation of the polarisation with polar angle yields the two parameters ${\cal A}_e = 0.1504 \pm 0.0068 $ and ${\cal A}_{\tau} = 0.1451 \pm 0....
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Study of the fragmentation of $b$ quarks into $B$ mesons at the $Z$ peak
Author(s) :
Heister, A.
,
Schael, S.
,
Barate, R.
,
De Bonis, I.
,
Decamp, D.
,
Goy, C.
,
Lees, J P.
,
Merle, E.
,
Minard, M N.
,
Pietrzyk, B.
Description :
The fragmentation of b quarks into B mesons is studied with four million hadronic Z decays collected by the ALEPH experiment during the years 1991-1995. A semi-exclusive reconstruction of B->l nu D(*) decays is performed, by combining lepton candidates with fully reconstructed D(*) mesons while the ...
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Measurement of the Michel parameters and the $\nu_{\tau}$ helicity in $\tau$ lepton decays
Author(s) :
Heister, A.
,
Schael, S.
,
Barate, R.
,
De Bonis, I.
,
Decamp, D.
,
Goy, C.
,
Lees, J P.
,
Merle, E.
,
Minard, M N.
,
Pietrzyk, B.
Description :
A measurement of the Michel parameters and the average $\nu_\tau$ helicity in $\tau$ lepton decays is described. The data was collected with the ALEPH detector at LEP during the years 1991 to 1995. A total integrated luminosity of 155\,$\text{pb}^{-1}$ is analysed. The Michel parameters $\rho_l$, $\...
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Undetermined