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The design and performance of the ZEUS micro vertex detector

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 581:3 (2007) 656-686

Authors:

A Polini, I Brock, S Goers, A Kappes, UF Katz, E Hilger, J Rautenberg, A Weber, A Mastroberardino, E Tassi, V Adler, LAT Bauerdick, I Bloch, T Haas, U Klein, U Koetz, G Kramberger, E Lobodzinska, R Mankel, J Ng, D Notz, MC Petrucci, B Surrow, G Watt, C Youngman, W Zeuner, C Coldewey, R Heller, E Gallo, T Carli, V Chiochia, D Dannheim, E Fretwurst, A Garfagnini, R Klanner, B Koppitz, J Martens, M Milite, K Tokushuku, I Redondo, H Boterenbrood, E Koffeman, P Kooijman, E Maddox, H Tiecke, M Vazquez, J Velthuis, L Wiggers, RCE Devenish, M Dawson, J Ferrando, G Grzelak, K Korcsak-Gorzo, T Matsushita, K Oliver, P Shield, R Walczak, A Bertolin, E Borsato, R Carlin, F Dal Corso, A Longhin, M Turcato, T Fusayasu, R Hori, T Kohno, S Shimizu, HE Larsen, R Sacchi, A Staiano, M Arneodo, M Ruspa, J Butterworth, C Gwenlan, J Fraser, D Hayes, M Hayes, J Lane, D Nicholass, G Nixon, M Postranecky, M Sutton, M Warren

Abstract:

In order to extend the tracking acceptance, to improve the primary and secondary vertex reconstruction and thus enhancing the tagging capabilities for short lived particles, the ZEUS experiment at the HERA Collider at DESY installed a silicon strip vertex detector. The barrel part of the detector is a 63 cm long cylinder with silicon sensors arranged around an elliptical beampipe. The forward part consists of four circular shaped disks. In total just over 200k channels are read out using 2.9 m2 of silicon. In this report a detailed overview of the design and construction of the detector is given and the performance of the completed system is reviewed. © 2007 Elsevier B.V. All rights reserved.
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CRESST - status and future

NUCL PHYS B-PROC SUP 173 (2007) 104-107

Authors:

H Kraus, G Angloher, M Bauer, I Bavykina, C Bucci, P Christ, C Ciemniak, C Cozzini, C Coppi, F von Feilitzsch, D Hauff, S Henry, J Imber, C Isaila, T Jagemann, J Jochum, JC Lanfranchi, R Lang, B Majorovits, M Malek, R McGowan, V Mikhailik, J Ninkovic, E Pantic, F Petricca, S Pfister, W Potzel, F Probst, Y Ramachers, W Rau, M Razeti, K Rottler, S Scholl, W Seidel, M Stark, L Stodolsky, A Tolhurst, W Westphal, H Wulandari

Abstract:

We present results on WIMP dark matter interaction, obtained using cryogenic phonon-scintillation detectors. The targets are CaWO4 scintillating crystals with phonon sensors, while scintillation is detected with an associated cryogenic light detector. The combination of phonon and light signals leads to a strong suppression of nonnuclear recoil backgrounds. Results obtained before the upgrade of CRESST are presented and a status report on the upgrade itself is given.
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EURECA - the European future of dark matter searches with cryogenic detectors

NUCL PHYS B-PROC SUP 173 (2007) 168-171

Authors:

H Kraus, M Bauer, I Bavykina, A Benoit, J Blumer, A Broniatowski, V Brudanin, G Burghart, P Camus, A Chantelauze, M Chapellier, G Chardin, P Christ, C Ciemniak, C Coppi, M De Jesus, A De Lesquen, H Deschamps, P Di Stefano, L Dumoulin, K Eitel, F von Feilitzsch, M Fesquet, J Gascon, G Gerbier, C Goldbach, M Gros, D Hauff, S Henry, M Horn, J Imber, C Isaila, J Jochum, A Juillard, M Kimmerle, JC Lanfranchi, R Lemrani, A Lubashevsky, M Luca, M Malek, S Marnieros, R McGowan, V Mikhailik, XF Navick, T Niinikoski, G Nollez, E Pantic, P Pari, L Perevoshchikov, F Petricca, S Pfister, W Potzel, F Probst, W Rau, F Ritter, K Rottler, V Sanglard, S Scholl, F Schwamm, W Seidel, A Smolnikov, M Stern, M Teshima, B Tolhurst, W Westphal, P Wikus, J Wolf, E Yakushev

Abstract:

EURECA (European Underground Rare Event Calorimeter Array) is a new project, searching for dark matter, with largely the present groups of the CRESST and EDELWEISS experiments and already a few new groups. The aim is to explore scalar cross sections in the 10(-9) - 10(-10) picobarn region with a target mass of up to one tonne. A major advantage of EURECA is our planned use of more that just one target material (multi target experiment for WIMP identification). In preparation for this large-scale experiment, R&D for EURECA is provided through the current phases of CRESST and EDELWEISS.
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Precise measurement of the top-quark mass in the lepton+jets topology at CDF II

Physical Review Letters 99:18 (2007)

Authors:

T Aaltonen, A Abulencia, J Adelman, T Affolder, T Akimoto, MG Albrow, S Amerio, D Amidei, A Anastassov, K Anikeev, A Annovi, J Antos, M Aoki, G Apollinari, T Arisawa, A Artikov, W Ashmanskas, A Attal, A Aurisano, F Azfar, P Azzi-Bacchetta, P Azzurri, N Bacchetta, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, S Baroiant, V Bartsch, G Bauer, PH Beauchemin, F Bedeschi, S Behari, G Bellettini, J Bellinger, A Belloni, D Benjamin, A Beretvas, J Beringer, T Berry, A Bhatti, M Binkley, D Bisello, I Bizjak, RE Blair, C Blocker, B Blumenfeld, A Bocci, A Bodek, V Boisvert, G Bolla, A Bolshov, D Bortoletto, J Boudreau, A Boveia, B Brau, L Brigliadori, C Bromberg, E Brubaker, J Budagov, HS Budd, S Budd, K Burkett, G Busetto, P Bussey, A Buzatu, KL Byrum, S Cabrera, M Campanelli, M Campbell, F Canelli, A Canepa, S Carrillo, D Carlsmith, R Carosi, S Carron, B Casal, M Casarsa, A Castro, P Catastini, D Cauz, M Cavalli-Sforza, A Cerri, L Cerrito, SH Chang, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, I Cho, K Cho, D Chokheli, JP Chou, G Choudalakis, SH Chuang, K Chung, WH Chung, YS Chung, M Cilijak

Abstract:

We present a measurement of the mass of the top quark from proton-antiproton collisions recorded at the CDF experiment in Run II of the Fermilab Tevatron. We analyze events from the single lepton plus jets final state (tt̄→W+bW-b̄→lνbqq̄′b̄). The top-quark mass is extracted using a direct calculation of the probability density that each event corresponds to the tt̄ final state. The probability is a function of both the mass of the top quark and the energy scale of the calorimeter jets, which is constrained in situ by the hadronic W boson mass. Using 167 events observed in 955pb-1 of integrated luminosity, we achieve the single most precise measurement of the top-quark mass, 170.8±2.2(stat.) ±1.4(syst.)GeV/c2. © 2007 The American Physical Society.
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Measurement of the Λb0 lifetime using semileptonic decays

Physical Review Letters 99:18 (2007)

Authors:

VM Abazov, B Abbott, M Abolins, BS Acharya, M Adams, T Adams, E Aguilo, SH Ahn, M Ahsan, GD Alexeev, G Alkhazov, A Alton, G Alverson, GA Alves, M Anastasoaie, LS Ancu, T Andeen, S Anderson, B Andrieu, MS Anzelc, Y Arnoud, M Arov, M Arthaud, A Askew, B Asman, ACS Assis Jesus, O Atramentov, C Autermann, C Avila, C Ay, F Badaud, A Baden, L Bagby, B Baldin, DV Bandurin, S Banerjee, P Banerjee, E Barberis, AF Barfuss, P Bargassa, P Baringer, J Barreto, JF Bartlett, U Bassler, D Bauer, S Beale, A Bean, M Begalli, M Begel, C Belanger-Champagne, L Bellantoni, A Bellavance, JA Benitez, SB Beri, G Bernardi, R Bernhard, L Berntzon, I Bertram, M Besançon, R Beuselinck, VA Bezzubov, PC Bhat, V Bhatnagar, C Biscarat, G Blazey, F Blekman, S Blessing, D Bloch, K Bloom, A Boehnlein, D Boline, TA Bolton, G Borissov, K Bos, T Bose, A Brandt, R Brock, G Brooijmans, A Bross, D Brown, NJ Buchanan, D Buchholz, M Buehler, V Buescher, S Burdin, S Burke, TH Burnett, CP Buszello, JM Butler, P Calfayan, S Calvet, J Cammin, S Caron, W Carvalho, BCK Casey, NM Cason, H Castilla-Valdez, S Chakrabarti, D Chakraborty, KM Chan

Abstract:

We report a measurement of the Λb0 lifetime using a sample corresponding to 1.3fb-1 of data collected by the D0 experiment in 2002-2006 during run II of the Fermilab Tevatron collider. The Λb0 baryon is reconstructed via the decay Λb0→μν̄Λc+X. Using 4437±329 signal candidates, we measure the Λb0 lifetime to be τ(Λb0)=1.290-0.110+0.119(stat)-0.091+0.087(syst)ps, which is among the most precise measurements in semileptonic Λb0 decays. This result is in good agreement with the world average value. © 2007 The American Physical Society.
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