The DELPHI Microvertex detector

Bingefors, N.; Borner, H.; Boulter, R.; Caccia, M.; Chabaud, V.; Dijkstra, H.; Eerola, P.; Gross, E.; Horisberger, R.; Hubbeling, L.; Hyams, B.; Karlsson, M.; Mæhlum, G.; Ratz, K.; Roditi, I.; Straver, J.; Trischuk, W.; Weilhammer, P.; Dufour, Y.; Brückman, P.; Jałocha, P.; Kapusta, P.; Turała, M.; Zalewska, A.; Lindgren, J.; Orava, R.; Österberg, K.; Ronnqvist, C.; Saarikko, H.; Saarikko, J. P.; Tuuva, T.; Dalmagne, B.; Bambade, P.; Couchot, F.; Fulda, F.; Amery, A.; Booth, P.S.L.; Campion, A.; McNulty, R.; Smith, N. A.; Andreazza, A.; Battaglia, M.; Biffi, P.; Bonvicini, V.; Kucewicz, W.; Meroni, C.; Redaelli, N.; Stocchi, A.; Troncon, C.; Vegni, G.; Dauncey, P. D.; Mazzucato, M.; Pegoraro, M.; Peisert, A.; Baubillier, M.; Chauveau, J.; Silva, W. Da; Genat, J.F.; Rossel, F.; Adye, T.; Apsimon, R.; Bizell, J.; Denton, L.; Kalmus, G.; Lidbury, J.; Seller, P.; Tyndel, M.; Dulinski, W.; Husson, D.; Lounis, A.; Schaeffer, M.; Turchetta, R.; Brenner, R.; Sundell, E.

doi:10.1016/0168-9002(93)90663-3

Cited by 71 publications

(38 citation statements)

References 7 publications

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“…+ events. The value of (26 2) m [8] for the asymptotic charged-particle track extrapolation error was obtained.…”

Section: The Delphi Detectormentioning

confidence: 99%

Measurement of the forward-backward asymmetry ofe + e −→Z→ $$b\bar b$$ using prompt leptons and a lifetime tag

Abreu¹,

Adam²,

Adye³

et al. 1995

Z. Phys. C - Particles and Fields

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The forward-backward asymmetry of the process e + e ! Z ! bb has been measured using events collected by the DELPHI experiment during the 1991 and 1992 LEP runs. This data sample corresponded to 884 000 hadronic Z decays at a centre-of-mass energy p s M Z . The tagging of b-quark events was performed using two approaches; the rst was based on the semileptonic decay c hannels b ! X + and b ! X + e , the second used a lifetime tag with jet-charge reconstruction. The results of these two methods were combined to give A bb FB = 0 : 107 0:011(stat: + syst: + mixing): With the semileptonic sample, the forward-backward asymmetry of the process e + e ! Z ! cc was also measured to be A cc FB = 0 : 083 0:022(stat:) 0:016(syst:): The e ective v alue of the Weinberg mixing angle derived from these measurements was sin 2 lep eff = 0 : 2294 0:0021:To be submitted to Zeit. f. Physik C ii

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“…+ events. The value of (26 2) m [8] for the asymptotic charged-particle track extrapolation error was obtained.…”

Section: The Delphi Detectormentioning

confidence: 99%

Measurement of the forward-backward asymmetry ofe + e −→Z→ $$b\bar b$$ using prompt leptons and a lifetime tag

Abreu¹,

Adam²,

Adye³

et al. 1995

Z. Phys. C - Particles and Fields

Self Cite

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“…To make the project a ordable components and systems were re-used from the previous silicon vertex detectors of DELPHI, namely some of the plaquettes and hybrids [2] and the data acquisition and service systems [4]. The complete Barrel and a large part of the VFT (the full set of ministrip detectors and 60% of the pixels) was in operation during the 1996 data taking.…”

Section: Design Considerationsmentioning

confidence: 99%

The DELPHI Silicon Tracker at LEP2

Chochula

Rosinský

Andreazza

et al. 1998

Nuclear Instruments and Methods in Physics Research Section A:

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Yves was one of the driving forces during the design and construction of the Silicon Tracker. He was killed in an avalanche on the Pointe Percee in January 1996, a victim of his passion for the high mountains. We would like to dedicate this paper to his memory. AbstractThe DELPHI Silicon Tracker, an ensemble of microstrips, ministrips and pixels, was completed in 1997 and has accumulated over 70 pb 1 of high energy data. The Tracker is optimised for the LEP2 physics programme. It consists of a silicon microstrip barrel and endcaps with layers of silicon pixel and ministrip detectors. In the barrel part, three dimensional b tagging information is available down to a polar angle of 25 . Impact parameter resolutions have been measured of 28 m 71= (p sin 3 2 ) m i n R and 34 m 69=p m i n Rz, where p is the track momentum in GeV=c. The amount of material has been kept low with the use of double-sided detectors, double-metal readout, and light mechanics. The pixels have dimensions of 330 330 m 2 and the ministrips have a readout pitch of 200 m. The forward part of the detector shows average e ciencies of more than 96%, has signal-to-noise ratios of up to 40 in the ministrips, and noise levels at the level of less than one part per million in the pixels. Measurements of space points with low backgrounds are provided, leading to a vastly improved tracking e ciency for the region with polar angle less than 25 .3

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“…The micro-vertex detector (VD) is located between the LEP beam pipe and the ID [10]. It consists of three concentric layers of silicon microstrip detectors at radii of 6.3, 9 and 11 cm from the beam line.…”

Section: The Delphi Detectormentioning

confidence: 99%

Measurement of the partial decay width $R_b^0 = \Gamma_{b\bar{b}}/\Gamma_{had}$ of the $Z$ with the DELPHI detector at LEP

Abreu

Gil

1996

Zeitschrift f�r Physik C Particles and Fields

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Link to publication Citation for published version (APA): Abreu, P., Agasi, E. E., Boudinov, E., Hao, W., Holthuizen, D. J., Kluit, P. M., ... van Eldik, J. E. (1996). Measurement of the partial decay width R_b^0 = Gamma_b\overline{b}/Gamma_had of the Z with the DELPHI detector at LEP. Zeitschrift für Physik. C, Particles and Fields, 70, 531. https://doi.org/10.1007/s002880050131 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Download date: 29 Apr 2019Z. Phys. C 70, 531-547 (1996) ZEITSCHRIFT FÜR PHYSIK C Abstract. The partial decay width of the Z to bb quark pairs has been measured by the DELPHI detector at LEP. Bhadrons, containing b-quarks, were tagged by several methods using tracks with large impact parameters to the primary vertex complemented sometimes by event shape variables or using leptons with high transverse momentum relative to the hadron. In order to reduce the systematic uncertainties, in all methods the b-tagging efficiency has been extracted directly from the data. Combining all methods, the value: Γ bb Γ had = 0.2216 ± 0.0016(stat.) ± 0.0021(syst.)was found, where the cc production fraction was fixed to its Standard Model value.

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The DELPHI Microvertex detector

Cited by 71 publications

References 7 publications

Measurement of the forward-backward asymmetry ofe + e −→Z→ $$b\bar b$$ using prompt leptons and a lifetime tag

Measurement of the forward-backward asymmetry ofe + e −→Z→ $$b\bar b$$ using prompt leptons and a lifetime tag

The DELPHI Silicon Tracker at LEP2

Measurement of the partial decay width $R_b^0 = \Gamma_{b\bar{b}}/\Gamma_{had}$ of the $Z$ with the DELPHI detector at LEP

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