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CERN Document Server 2,044 Datensätze gefunden  1 - 10nächsteEnde  gehen zum Datensatz: Die Suche hat 1.60 Sekunden gedauert. 
1.
(100)
Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays / DELPHI Collaboration
The semileptonic branching fractions for primary and cascade b decays BR(b -> lepton-), BR(b -> c -> lepton+) and BR(b -> cbar -> lepton-) were measured in hadronic Z decays collected by the DELPHI experiment at LEP. The sample was enriched in b decays using the lifetime information and various techniques were used to separate leptons from direct or cascade b decays [...]
hep-ex/0105080; CERN-EP-2000-157; CERN-EP-2000-157.- Geneva : CERN, 2001 - 40 p. - Published in : Eur. Phys. J. C 20 (2001) 455-478 Fulltext: arXiv:hep-ex_0105080 - PDF; ep-2000-157 - PDF; External link: Preprint
In : 30th International Conference on High-energy Physics, Osaka, Japan, 27 Jul - 2 Aug 2000, pp.e-page 408 - Please contact the library if you need to access this document.
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2.
(91)
Measurement of the $\overline{B} \to D^{(*)}\pi l\overline{\nu}_l$ Branching Fraction / DELPHI Collaboration
A study of $b$ semileptonic decays into $D$, $D\pi^{\pm}$ and $D^*\pi^{\pm}$ final states is presented.The $D^0$, $D^+$ and $D^{*+}$ mesons are exclusively reconstructed in $Z$ decay data recorded from 1992 to 1995in the DELPHI experiment at LEP. The overall branching fractions are measured to be: $BR(b -> D^0 \ell^- \bar{\nu}_{\ell} X) = (7.04 +/- 0.34 (stat) +/- 0.36 (syst.exp) +/- 0.17 (BR_D))\%,$ $BR(b -> D^+ \ell^- \bar{\nu}_{\ell} X) = (2.72 +/- 0.19 (stat) +/- 0.16 (syst.exp) +/- 0.18 (BR_D))\%$, $BR(b -> D^{*+} \ell^- \bar{\nu}_{\ell} X) = (2.75 +/- 0.17 (stat) +/- 0.13 (syst.exp) +/- 0.09 (BR_D))\%$ where the $D^0$ and $D^+$ results include also contributions from $D^{*0}$ and $D^{*+}$ decays..
hep-ex/0105052; CERN-EP-99-174; CERN-EP-99-174.- Geneva : CERN, 2000 - 25 p. - Published in : Phys. Lett. B 475 (2000) 407-28 Fulltext: ep-1999-174 - PDF; arXiv:hep-ex_0105052 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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3.
(88)
Measurement of |$V_{cb}$| using the semileptonic decay $\overline{B^{0}_{d}} \to D*^{+} l^{-}\overline{\nu}_{l}$ / DELPHI Collaboration
Data from Z decays in DELPHI have been searched for anti-B0d -> D*+ l- anti-nu_l with the D*+ decaying to D0 pi+ and D0 -> K- pi+, K- pi+ pi+ pi- or K- pi+ (pi0). These events are used to measure the CKM matrix element |V_cb| and the form factor slope, rho_{A_1}^2: F_D*(1)|Vcb| = 0.0392 +/- 0.0018 +/- 0.0023: rho_{A_1}^2 = 1.32 +/- 0.15 +/- 0.33 corresponding to a branching fraction: BR(anti-B0d -> D*+ l- anti-nu_l) = (5.90 +/- 0.22 +/- 0.50)%. [...]
hep-ex/0401023; CERN-EP-2003-057; CERN-EP-2003-057.- Geneva : CERN, 2004 - 33 p. - Published in : Eur. Phys. J. C 33 (2004) 213-232 Fulltext: arXiv:hep-ex_0401023 - PDF; 0401023 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
(85)
Production of $\Xi_{c}^{0}$ and $\Xi_{b}$ in Z decays and lifetime measurement of $\Xi_{b}$ / DELPHI Collaboration
The charmed strange baryon Xi_c^0 was searched for in the decay channel Xi_c^0 -> Xi- pi+, and the beauty strange baryon Xi_b in the inclusive channel Xi_b -> Xi- l- anti-nu X, using the 3.5 million hadronic Z events collected by the DELPHI experiment in the years 1992--1995. The Xi- was reconstructed through the decay Xi- -> Lambda pi-, using a constrained fit method for cascade decays. [...]
hep-ex/0510023; CERN-PH-EP-2004-068; CERN-PH-EP-2004-068.- Geneva : CERN, 2005 - 21 p. - Published in : Eur. Phys. J. C 44 (2005) 299-309 Fulltext: 0510023 - PDF; arXiv:hep-ex_0510023 - PDF; External link: Preprint
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5.
(83)
Measurement of |$V_{ub}$| using b hadron semileptonic decays / OPAL Collaboration
The magnitude of the CKM matrix element Vub is determined by measuring the inclusive charmless semileptonic branching fraction of beauty hadrons at OPAL based on b -> Xu l nu event topology and kinematics. This analysis uses OPAL data collected between 1991 and 1995, which correspond to about four million hadronic Z decays. [...]
hep-ex/0107016; CERN-EP-2001-044; CERN-EP-2001-044.- Geneva : CERN, 2001 - 22 p. - Published in : Eur. Phys. J. C 21 (2001) 399-410 Fulltext: 0107016 - PDF; arXiv:hep-ex_0107016 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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6.
(80)
A Measurement of the Tau Topological Branching Ratios / DELPHI Collaboration
Using data collected in the DELPHI detector at LEP-1, measurements of the inclusive tau branching ratios for decay modes containing one, three, or five charged particles have been performed, giving the following results: B_1 = B(\tau^- -> (particle)^- \geq 0pi^0 \geq 0K^0 \nu_\tau(\bar{\nu})) = (85.316 +/- 0.093 +/- 0.049)%; B_3 = B(\tau^- -> 2h^-h^+ \geq 0pi^0 \geq 0K^0 \nu_\tau) = (14.569 +/- 0.093 +/- 0.048)%; B_5 = B(\tau^- -> 3h^-2h^+ \geq 0pi^0 \geq 0K^0 \nu_\tau) = (0.115 +/- 0.013 +/- 0.006)%, where h is either a charged pi or K meson. The first quoted uncertainties are statistical and the second systematic..
hep-ex/0105047; CERN-EP-2001-030; CERN-DELPHI-2001-091-CONF-519; CERN-EP-2001-030; DELPHI-2001-091-CONF-519.- Geneva : CERN, 2001 - 32 p. - Published in : Eur. Phys. J. C 20 (2001) 617-637 Fulltext: 0105047 - PDF; arXiv:hep-ex_0105047 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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7.
(79)
Determination of |$V_{ub}$|/|$V_{cb}$| with DELPHI at LEP / DELPHI Collaboration
The ratio of the CKM quark-mixing matrix elements |V_{ub}|/|V_{cb}|has been measured using B hadron semileptonic decays.The analysis is based on a novel technique, recently proposed by theoreticians, that uses the reconstructed mass M_X ofthe secondary hadronic system produced in association with an identified lepton.Since B rightarrow X_u \ell \bar \nu transitions are characterisedby hadronic masses below those of the $D$ mesons produced inB \rightarrow X_c \ell \bar \nu transitions, events with a reconstructed value of M_X significantly below the D massare selected.Further signal enrichments are obtained using thetopology of reconstructed decays and hadron identification.A fit to the numbers of decays in the b\to u enriched and depleted samples with M_X above and below 1.6 GeV/c^2and to the shapes of the lepton energy distribution in the Brest frame gives |V_{ub}|/|V_{cb}|= \mathrm{0.103^{+0.011}_{-0.012}~(stat.)\pm0.016~(syst.)\pm0.010~(mo del)}%The model dependance of $b \rightarrow u \ell \bar \nu$%is significantly reduced with this method.and, correspondingly, a charmless semileptonic $B$ decay branching fractionof BR($B \rightarrow X_u \ell \bar \nu) = \mathrm{(1.57 \pm 0.35~(stat.)\pm0.48~(syst.)\pm0.27~(model))\times 10^{-3}}$..
hep-ex/0105054; CERN-EP-2000-030; CERN-EP-2000-030.- Geneva : CERN, 2000 - 24 p. - Published in : Phys. Lett. B 478 (2000) 14-30 Fulltext: arXiv:hep-ex_0105054 - PDF; ep-2000-030 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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8.
(79)
A Precise Measurement of the Tau Lifetime / DELPHI Collaboration
The tau lepton lifetime has been measured with the e+e- -> tau+tau- events collected by the DELPHI detector at LEP in the years 1991-1995. Three different methods have been exploited, using both one-prong and three-prong tau decay channels. [...]
hep-ex/0410010; CERN-EP-2003-070; CERN-EP-2003-070.- Geneva : CERN, 2004 - 27 p. - Published in : Eur. Phys. J. C 36 (2004) 283-296 Fulltext: ep-2003-070 - PDF; arXiv:hep-ex_0410010 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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9.
(79)
Inclusive b Decays to Wrong Sign Charmed mesons / DELPHI Collaboration
The production of wrong sign charmed mesons b -> \bar D_{(s)} X, D_{(s)}=(D0,D+,D_s), is studied using the data collected by the DELPHI experiment in the years 1994 and 1995. Charmed mesons in Z -> b bbar events are exclusively reconstructed by searching for the decays D0 -> K- pi+, D+ -> K- pi+ pi+ and D_s^+ -> phi pi+ -> K+ K- pi+. [...]
hep-ex/0303031; CERN-EP-2002-089; CERN-EP-2002-089.- Geneva : CERN, 2003 - 16 p. - Published in : Phys. Lett. B 561 (2003) 26-40 Fulltext: S0370269303003873 - XML; ep-2002-089 - PDF; arXiv:hep-ex_0303031 - PDF; 0303031 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
(77)
The $\eta_c$(2980) formation in two-photon collisions at LEP energies / DELPHI Collaboration
eta_c(2980) production in gamma-gamma interactions has been detected via its decays into K0_s K+/- pi-/+, K+ K- K+ K- and K+ K- pi+ pi- in the data taken with the DELPHI detector at LEP1 and LEP2 energies. The two-photon radiative width averaged over all observed decay channels is \Gamma_{\gamma\gamma} = 13.9 +/- 2.0 (stat.) +/- 1.4 (syst.) +/- 2.7 (BR) keV. [...]
hep-ex/0311002; CERN-EP-2003-035; CERN-EP-2003-035.- Geneva : CERN, 2003 - 12 p. - Published in : Eur. Phys. J. C 31 (2003) 481-489 Fulltext: arXiv:hep-ex_0311002 - PDF; ep-2003-035 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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