1. |
- Abreu, P, et al.
(författare)
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A measurement of alpha(s) from the scaling violation in e(+)e(-) annihilation
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 398:1-2, s. 194-206
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The hadronic fragmentation functions of the various quark flavours and of gluons are measured in a study of the inclusive hadron production from Z(0) decays with the DELPHI detector and are compared with the fragmentation functions measured elsewhere at e
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2. |
- Abreu, P, et al.
(författare)
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A precise measurement of the B-d(0) meson lifetime using a new technique
- 1997
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Ingår i: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. - : SPRINGER VERLAG. - 0170-9739. ; 74:1, s. 19-32
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- From data recorded by DELPHI between 1991 and 1994, which corresponds to 3.2 million hadronic Z(0) decays, a measurement of the <(B-d(0))over bar> meson lifetime, based on the inclusive reconstruction of 3520 +/- 150 semileptonic decays of the type <(B-d(
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3. |
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4. |
- Abreu, P, et al.
(författare)
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An upper limit for Br(Z(0)->ggg) from symmetric 3-jet Z(0) hadronic decays
- 1996
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 389:2, s. 405-415
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- An upper limit for BR(Z(0) --> 3g) is obtained from a correlation method, which distinguishes statistically between quark and gluon jets by using the difference in their charged particle multiplicity distributions. From the sample of threefold symmetric t
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5. |
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6. |
- Abreu, P, et al.
(författare)
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Identified particles in quark and gluon jets
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 401:1-2, s. 118-130
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A sample of about 1.4 million hadronic Z decays, selected among the data recorded by the DELPHI detector at LEP during 1994, was used to measure for the first time the momentum spectra of K+, K-0, p, Lambda and their antiparticles in gluon and quark jets.
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7. |
- Abreu, P, et al.
(författare)
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Measurement and interpretation of the W-pair cross-section in e(+)e(-) interactions at 161 GeV
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 397:1-2, s. 158-170
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In 1996 LEP ran at a centre-of-mass energy of 161 GeV, just above the threshold of W-pair production. DELPHI accumulated data corresponding to an integrated luminosity of 9.93 pb(-1), and observed 29 events that are considered as candidates for W-pair pro
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8. |
- Abreu, P, et al.
(författare)
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Measurement of B-d(0)-(B-d(0))over-bar oscillations
- 1997
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Ingår i: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. - : SPRINGER VERLAG. - 0170-9739. ; 76:4, s. 579-598
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- B-d(0) meson oscillations are measured in hadronic Z(0) decays using the charge of a lepton or the mean charge of an event hemisphere to sign the presence of a b or a (b) over bar quark when it is produced, and using the charge of a lepton emitted at larg
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9. |
- Abreu, P, et al.
(författare)
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Measurement of correlations between pions from different W's in e(+)e(-)->W+W- events
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 401:1-2, s. 181-191
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Correlations between pions from different W's in e(+)e(-) --> W+W- events are studied using data collected by the DELPHI detector at LEP running at a centre-of-mass energy of 172 GeV in 1996. At the present level of statistics, no enhancement of the corre
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10. |
- Abreu, P, et al.
(författare)
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Measurement of the e(+)e(-)->gamma gamma(gamma) cross section at the LEP energies
- 1998
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 433:3-4, s. 429-440
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The total and the differential cross-sections for the reaction e(+)e(-) --> gamma gamma(gamma) have been measured with the DELPHI detector at LEP at centre-of-mass energies from 130 to 183 GeV for an integrated luminosity of 78.19 pb(-1). The results agre
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11. |
- Abreu, P, et al.
(författare)
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Measurement of the inclusive charmless and double-charm B branching ratios
- 1998
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 426:1-2, s. 193-206
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The DELPHI experiment at LEP has measured the inclusive charmless B hadron decay branching ratio, the B branching ratio into two charmed particles, and the total number of charmed particles per B decay, using the hadronic Z data taken between 1992 and 199
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12. |
- Abreu, P, et al.
(författare)
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Measurement of the multiplicity of gluons splitting to bottom quark pairs in hadronic Z(0) decays
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 405:1-2, s. 202-214
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- An inclusive measurement of the average multiplicity of b (b) over bar pairs from gluons, g(b (b) over bar), in hadronic Z(0) events collected by the DELPHI experiment at LEP, is presented. A counting technique, based on jet b-tagging in 4-jet events, has
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13. |
- Abreu, P, et al.
(författare)
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Measurement of the spin density matrix for the rho(0), K*(0)(892) and phi produced in Z(0) decays
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 406:3, s. 271-286
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The spin density matrix elements for the rho(0), K-*0(892) and phi produced in hadronic Z(0) decays are measured in the DELPHI detector. There is no evidence for spin alignment of the K-*0(892) and phi, in the region x(p) less than or equal to 0.3 (x(p) =
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14. |
- Abreu, P, et al.
(författare)
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Measurement of the transverse spin correlation in Z->tau(+)tau(-) decays
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 404:1-2, s. 194-206
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The measurement of the correlation between the transverse spin components of tau(+)tau(-) pairs collected during 1992 to 1994 with the DELPHI detector at LEP1 is presented. A value C-TT = 0.87 +/- 0.20 (stat.)(-0.12)(+0.10) (syst.) was obtained for the co
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15. |
- Abreu, P, et al.
(författare)
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Measurement of the triple gluon vertex from double quark tagged 4-jet events
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 414:3-4, s. 401-418
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The 4-jet events collected by the DELPHI experiment at LEP1 in 1992, 1993 and 1994 are analysed to determine the contribution of the triple-gluon vertex. Two of the four jets are tagged as jets from b- or c-quarks using lifetime and lepton transverse mome
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16. |
- Abreu, P, et al.
(författare)
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Measurement of trilinear gauge couplings in e(+)e(-) collisions at 161 GeV and 172 GeV
- 1998
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 423:1-2, s. 194-206
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Trilinear gauge boson couplings are measured using data taken by DELPHI at 161 GeV and 172 GeV, Values for WWV couplings (V = Z,gamma) are determined from a study of the reactions e(+)e(-) --> W+W- and e(+)e(-) --> We nu, using differential distributions
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17. |
- Abreu, P, et al.
(författare)
-
Rapidity correlations in Lambda baryon and proton production in hadronic Z(0) decays
- 1998
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 416:1-2, s. 247-256
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In an analysis of multihadronic events recorded at LEP by DELPHI in the years 1992 through 1994, rapidity correlations of Lambda-Lambda, proton-proton, and Lambda-proton pairs are compared with each other and with the predictions of the string fragmentati
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18. |
- Abreu, P, et al.
(författare)
-
Search for charged Higgs bosons in e(+)e(-) collisions at root s = 172 GeV
- 1998
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 420:1-2, s. 140-156
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This paper presents results on charged Higgs boson production, based on LEP data collected at root s = 172 GeV, that complement the previous DELPHI results obtained at centre of mass energies up to 161 GeV. The charged Higgs bosons are assumed to be pair
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19. |
- Abreu, P, et al.
(författare)
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Search for charginos, neutralinos and gravitinos at LEP
- 1998
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Ingår i: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER VERLAG. - 1434-6044. ; 1:1-2, s. 1-20
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- An update of the searches for charginos and neutralinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161 GeV and 172 GeV. No signal is found. For a sneutrino with mass above 300 GeV/c(2) and a mass difference
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20. |
- Abreu, P, et al.
(författare)
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Search for excited leptons in e(+)e(-) collisions at root s=161 GeV
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 393:1-2, s. 245-260
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A search with the DELPHI detector at LEP for excited leptons (e*, mu*, tau* and nu*) decaying through gamma, W or Z transitions is reported. The data used correspond to an integrated luminosity of 10 pb(-1) e(+)e(-) centre-of-mass energy at an e of 161 Ge
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21. |
- Abreu, P, et al.
(författare)
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Search for neutral and charged Higgs bosons in e(+)e(-) collisions at root s=161 GeV and 172 GeV
- 1998
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Ingår i: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER VERLAG. - 1434-6044. ; 2:1, s. 1-37
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A search for neutral and charged Higgs bosons has been performed in the data collected by the DELPHI detector at centre-of-mass energies of 161 GeV and 172 GeV. The analysis assumes either the pair-production of charged Higgs bosons, H+/-, or the producti
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22. |
- Abreu, P, et al.
(författare)
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Search for neutral heavy leptons produced in Z decays
- 1997
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Ingår i: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. - : SPRINGER VERLAG. - 0170-9739. ; 74:1, s. 57-71
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Weak isosinglet Neutral Heavy Leptons (nu(m)) have been searched for using data collected by the DELPHI detector corresponding to 3.3 x 10(6) hadronic Z(0) decays at LEP1. Four separate searches have been performed, for short-lived nu(m) production giving
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23. |
- Abreu, P, et al.
(författare)
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Search for stable heavy charged particles in e(+)e(-) collisions at root s=130-136, 161 and 172 GeV
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 396:1-4, s. 315-326
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A search for stable or long-lived heavy charged particles in e(+)e(-) interactions at energies of 130-136, 161 and 172 CeV has been performed using the data taken by the DELPHI experiment at LEP. The search is based on particle identification provided by
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24. |
- Abreu, P, et al.
(författare)
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Search for the B-c meson
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 398:1-2, s. 207-222
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In a sample of 3.02 million hadronic Z(0) decays collected by the DELPHI detector, 270 J/psi --> e(+)e(-) candidates have been selected. A search for fully reconstructed B-c(+/-) mesons has yielded one B-c(+/-) --> J/psi pi(+/-) candidate, no B-c(+/-) -->
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25. |
- Abreu, P, et al.
(författare)
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Tuning and test of fragmentation models based on identified particles and precision event shape data
- 1996
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Ingår i: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. - : SPRINGER VERLAG. - 0170-9739. ; 73:1, s. 11-59
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Event shape and charged particle inclusive distributions are measured using 750000 decays of the Z to hadrons from the DELPHI detector at LEP, These precise data allow a decisive confrontation with models of the hadronization process, Improved tunings of
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26. |
- Adam, W, et al.
(författare)
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Search for B-s(0)-(B-s(0))over-bar oscillations
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 414:3-4, s. 382-400
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Oscillations of B(s)(0)mesons were studied in events with a large transverse momentum lepton selected from 3.2 million hadronic Z(0) decays registered by DELPHI between 1991 and 1994. A limit on the mass difference between the physical B-s(0) states Delta
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