SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Johansson A. G. M.) "

Sökning: WFRF:(Johansson A. G. M.)

Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
61.
  • Abdallah, J., et al. (författare)
  • Measurement of the electron structure function F-2(e) at LEP energies
  • 2014
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 737, s. 39-47
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The hadronic part of the electron structure function F-2(e) has been measured for the first time, using e(+)e(-) data collected by the DELPHI experiment at LEP, at centre-of-mass energies of root s = 91.2-209.5 GeV. The data analysis is simpler than that of the measurement of the photon structure function. The electron structure function F-2(e) data are compared to predictions of phenomenological models based on the photon structure function. It is shown that the contribution of large target photon virtualities is significant. The data presented can serve as a cross-check of the photon structure function F-2(gamma) analyses and help in refining existing parameterisations.</p>
  •  
62.
  • Abdallah, J, et al. (författare)
  • Search for fermiophobic Higgs bosons in final states with photons at LEP 2
  • 2004
  • Ingår i: European Physical Journal C. Particles and Fields. - Springer. - 1434-6044. ; 35:3, s. 313-324
  • Tidskriftsartikel (refereegranskat)abstract
    • Higgs boson production with subsequent decay to photons was searched for in the data collected by the DELPHI detector at centre-of-mass energies between 183 GeV and 209 GeV, corresponding to a total integrated luminosity of nearly 650 pb(-1). No evidence for a signal was found, and limits were set on h(0)Z(0) and h(0)A(0) production with h(0) decay to photons. These results were used to exclude regions in the parameter space of fermiophobic scenarios of Two Higgs Doublet Models.
  •  
63.
  • Abdallah, J., et al. (författare)
  • Search for one large extra dimension with the DELPHI detector at LEP
  • 2009
  • Ingår i: European Physical Journal C. - 1434-6044 .- 1434-6052. ; 60:1, s. 17-23
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Single photons detected by the DELPHI experiment at LEP2 in the years 1997-2000 are reanalysed to investigate the existence of a single extra dimension in a modified ADD scenario with slightly warped large extra dimensions. The data collected at centre-of-mass energies between 180 and 209 GeV for an integrated luminosity of similar to 650 pb(-1) agree with the predictions of the Standard Model and allow a limit to be set on graviton emission in one large extra dimension. The limit obtained on the fundamental mass scale M-D is 1.69 TeV/c(2) at 95% CL, with an expected limit of 1.71 TeV/c(2).</p>
  •  
64.
  • Abdallah, J., et al. (författare)
  • Search for single top quark production via contact interactions at LEP2
  • 2011
  • Ingår i: European Physical Journal C. - 1434-6044 .- 1434-6052. ; 71:2, s. 1555
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Single top quark production via four-fermion contact interactions associated to flavour-changing neutral currents was searched for in data taken by the DELPHI detector at LEP2. The data were accumulated at centre-of-mass energies ranging from 189 to 209 GeV, with an integrated luminosity of 598.1 pb(-1). No evidence for a signal was found. Limits on the energy scale Lambda, were set for scalar-, vector- and tensor-like coupling scenarios.</p>
  •  
65.
  • Abdallah, J, et al. (författare)
  • Search for supersymmetric particles assuming R-parity non-conservation in e(+)e(-) collisions at root s=192 to 208 GeV
  • 2004
  • Ingår i: European Physical Journal C. Particles and Fields. - Springer. - 1434-6044. ; 36:1, s. 1-23
  • Tidskriftsartikel (refereegranskat)abstract
    • Searches for pair-production of supersymmetric particles under the assumption of non-conservation of R-parity with a dominant LL (E) over bar or (U) over bar(D) over bar(D) over bar term have been performed using the data collected by the DELPHI experiment at LEP in e(+)e(-) collisions at centre-of-mass energies from 192 up to 208 GeV. No excess of data above Standard Model expectations was observed. The results were used to constrain the MSSM parameter space and to derive limits on the masses of supersymmetric particles.
  •  
66.
  • Abdallah, J., et al. (författare)
  • Study of the dependence of direct soft photon production on the jet characteristics in hadronic Z (0) decays
  • 2010
  • Ingår i: European Physical Journal C. - 1434-6044 .- 1434-6052. ; 67:3-4, s. 343-366
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>An analysis of the direct soft photon production rate as a function of the parent jet characteristics is presented, based on hadronic events collected by the DELPHI experiment at LEP1. The dependences of the photon rates on the jet kinematic characteristics (momentum, mass, etc.) and on the jet charged, neutral and total hadron multiplicities are reported. Up to a scale factor of about four, which characterizes the overall value of the soft photon excess, a similarity of the observed soft photon behavior to that of the inner hadronic bremsstrahlung predictions is found for the momentum, mass, and jet charged multiplicity dependences. However for the dependence of the soft photon rate on the jet neutral and total hadron multiplicities a prominent difference is found for the observed soft photon signal as compared to the expected bremsstrahlung from final state hadrons. The observed linear increase of the soft photon production rate with the jet total hadron multiplicity and its strong dependence on the jet neutral multiplicity suggest that the rate is proportional to the number of quark pairs produced in the fragmentation process, with the neutral pairs being more effectively radiating than the charged ones.</p>
  •  
67.
  • Abdallah, J, et al. (författare)
  • A precise measurement of the tau lifetime
  • 2004
  • Ingår i: European Physical Journal C. Particles and Fields. - Springer. - 1434-6044. ; 36:3, s. 283-296
  • Tidskriftsartikel (refereegranskat)abstract
    • 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. Two measurements have been made using events in which both taus decay to a single charged particle. Combining these measurements gave tau(tau) ( 1 prong) = 291.8 +/- 2.3(stat) +/- 1.5(sys) fs. A third measurement using taus which decayed to three charged particles yielded tau(tau) (3 prong) = 288.6 +/- 2.4(stat) +/- 1.3(sys) fs. These were combined with previous DELPHI results to measure the tau lifetime, using the full LEP1 data sample, to be tau(tau) = 290.9 +/- 1.4(stat) +/- 1.0(sys) fs.
  •  
68.
  • Abdallah, J, et al. (författare)
  • Determination of the e(+)e(-)-&gt;gamma gamma(gamma) cross-section at LEP 2
  • 2004
  • Ingår i: European Physical Journal C. Particles and Fields. - Springer. - 1434-6044. ; 37:4, s. 405-419
  • Tidskriftsartikel (refereegranskat)abstract
    • A test of the benchmark QED process e(+) e(-) -->gammagamma(gamma) is reported, using the data collected with the DELPHI detector at LEP 2. The data analysed were recorded at centre-of-mass energies ranging from 161 GeV to 208 GeV and correspond to a total integrated luminosity of 656.4 pb(-1). The Born cross-section for the process e(+) e(-)-->gammagamma(gamma) was determined, confirming the validity of QED at the highest energies ever attained in electron-positron collisions. Lower limits on the parameters of a number of possible deviations from QED, predicted within theoretical frameworks expressing physics beyond the Standard Model, were derived.
  •  
69.
  • Abdallah, J, et al. (författare)
  • Flavour independent searchesfor hadronically decaying neutral Higgs bosons
  • 2005
  • Ingår i: European Physical Journal C. Particles and Fields. - Springer. - 1434-6044. ; 44:2, s. 147-159
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper describes flavour independent searches for hadronically decaying neutral Higgs bosons in the data collected by the DELPHI experiment at LEP, at centre-of-mass energies between 189 and 209 GeV. The collected data-set corresponds to an integrated luminosity of around 610 pb(-1). The e(+)e(-) -> hA and e(+)e(-) -> hZand processes are considered, with direct Higgs boson decays into hadrons. No evidence for Higgs boson production is found, and cross-section limits are set as a function of the Higgs boson masses. No explicit assumptions are made on the underlying physics beyond the Standard Model, allowing interpretation of the data in a large class of models.
  •  
70.
  • Abdallah, J, et al. (författare)
  • Measurement of the energy dependence of hadronic jet rates and the strong coupling alpha(s) from the four-jet rate with the DELPHI detector at LEP
  • 2005
  • Ingår i: European Physical Journal C. Particles and Fields. - Springer. - 1434-6044. ; 38:4, s. 413-426
  • Tidskriftsartikel (refereegranskat)abstract
    • Hadronic events from the data collected with the DELPHI detector at LEP within the energy range from 89 GeV to 209 GeV are selected, their jet rates are determined and compared to predictions of four different event generators. One of them is the recently developed APACIC++ generator which performs a massive matrix element calculation matched to a parton shower followed by string fragmentation. The four-jet rate is used to measure alpha(s) in the next-to-leading-order approximation yielding alpha(s)(M-Z(2)) = 0.1175 +/- 0.0030. The running of alpha(s) determined by using four-jet events has been tested. The logarithmic energy slope is measured to be dalpha(s)(-1)/d log E-cm = 1.14 +/- 0.36. Since the analysis is based on four-jet final states it represents an alternative approach to previous DELPHI alpha(s) measurements using event shape distributions.
  •  
Skapa referenser, mejla, bekava och länka
Åtkomst
fritt online (227)
Typ av publikation
tidskriftsartikel (1379)
konferensbidrag (97)
forskningsöversikt (8)
bokkapitel (6)
rapport (2)
annan publikation (2)
visa fler...
patent (2)
proceedings (redaktörskap) (1)
visa färre...
Typ av innehåll
refereegranskat (1409)
övrigt vetenskapligt (131)
populärvet., debatt m.m. (4)
Författare/redaktör
Boyko, I. (236)
Johansson, Tord, (195)
Kupsc, Andrzej, (173)
Wolke, Magnus, (163)
Bertrand, D. (160)
De Clercq, C., (154)
visa fler...
Cetin, S. A. (144)
Chen, G. (139)
Li, G. (139)
Lu, Y (139)
Wang, Z (139)
Bertani, M., (139)
Cai, H., (139)
Denig, A., (139)
Destefanis, M., (139)
Dong, J., (139)
Fava, L., (139)
Gao, Y., (139)
Liu, X (138)
Dedovich, D. (138)
Calcaterra, A., (138)
Cai, X. (137)
Ferroli, R. Baldini (137)
Fang, Y (137)
Li, H. B., (137)
Ablikim, M. (137)
An, F. F., (137)
An, Q., (137)
Ban, Y., (137)
Bennett, J. V., (137)
Boger, E., (137)
Briere, R. A., (137)
Chen, S. J., (137)
Chen, X. R., (137)
Chen, Y. B., (137)
Chu, X. K., (137)
Dai, H. L., (137)
Dai, J. P., (137)
Deng, Z. Y., (137)
Denysenko, I., (137)
Ding, Y., (137)
Dong, C., (137)
Dong, M. Y., (137)
Fang, J., (137)
Fang, S. S., (137)
Felici, G., (137)
Feng, C. Q., (137)
Fu, C. D., (137)
Gao, Q., (137)
Goetzen, K., (137)
visa färre...
Lärosäte
Uppsala universitet (437)
Karolinska Institutet (425)
Lunds universitet (337)
Göteborgs universitet (160)
Umeå universitet (116)
Chalmers tekniska högskola (102)
visa fler...
Kungliga Tekniska Högskolan (59)
Stockholms universitet (33)
Linköpings universitet (33)
Linnéuniversitetet (28)
Örebro universitet (10)
RISE (5)
Mittuniversitetet (3)
Mälardalens högskola (2)
Högskolan i Jönköping (2)
Försvarshögskolan (2)
Luleå tekniska universitet (1)
Högskolan Kristianstad (1)
Högskolan Väst (1)
Södertörns högskola (1)
Karlstads universitet (1)
Naturhistoriska riksmuseet (1)
Röda Korsets Högskola (1)
visa färre...
Språk
Engelska (1484)
Odefinierat språk (5)
Svenska (3)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (628)
Medicin och hälsovetenskap (501)
Teknik (41)
Samhällsvetenskap (23)
Lantbruksvetenskap (1)

År

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy