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First observation of B̄s0→Ds±K and Measurement of the Ratio of Branching Fractions B(B̄s0→Ds±K)/ B(B̄s0→Ds+π-)

Physical Review Letters 103:19 (2009)

Authors:

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

Abstract:

A combined mass and particle identification fit is used to make the first observation of the decay B̄s0→Ds±K□ and measure the branching fraction of B̄s0→Ds±K□ relative to B̄s0→Ds+π-. This analysis uses 1.2fb-1 integrated luminosity of pp̄ collisions at s=1.96TeV collected with the CDF II detector at the Fermilab Tevatron collider. We observe a B̄s0→Ds±K□ signal with a statistical significance of 8.1σ and measure B(B̄s0→ Ds±K□)/B(B̄s0→Ds+π-)=0.097±0.018(stat)±0. 009(syst). © 2009 The American Physical Society.
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Events with isolated leptons and missing transverse momentum and measurement of W production at HERA

European Physical Journal C 64:2 (2009) 251-271

Authors:

FD Aaron, C Alexa, V Andreev, B Antunovic, S Aplin, A Asmone, A Astvatsatourov, S Backovic, A Baghdasaryan, E Barrelet, W Bartel, K Begzsuren, O Behnke, A Belousov, JC Bizot, V Boudry, I Bozovic-Jelisavcic, J Bracinik, G Brandt, M Brinkmann, V Brisson, D Bruncko, A Bunyatyan, G Buschhorn, L Bystritskaya, AJ Campbell, KB Cantun Avila, F Cassol-Brunner, K Cerny, V Cerny, V Chekelian, A Cholewa, JG Contreras, JA Coughlan, G Cozzika, J Cvach, JB Dainton, K Daum, M Deák, Y De Boer, B Delcourt, M Del Degan, J Delvax, A De Roeck, EA De Wolf, C Diaconu, V Dodonov, A Dossanov, A Dubak, G Eckerlin, V Efremenko, S Egli, A Eliseev, E Elsen, S Essenov, A Falkiewicz, PJW Faulkner, L Favart, A Fedotov, R Felst, J Feltesse, J Ferencei, DJ Fischer, M Fleischer, A Fomenko, E Gabathuler, J Gayler, S Ghazaryan, A Glazov, I Glushkov, L Goerlich, M Goettlich, N Gogitidze, M Gouzevitch, C Grab, T Greenshaw, BR Grell, G Grindhammer, S Habib, D Haidt, M Hansson, C Helebrant, RCW Henderson, E Hennekemper, H Henschel, G Herrera, M Hildebrandt, KH Hiller, D Hoffmann, R Horisberger, T Hreus, M Jacquet, ME Janssen, X Janssen, V Jemanov, L Jönsson, AW Jung, H Jung, M Kapichine, J Katzy

Abstract:

Events with high energy isolated electrons, muons or tau leptons and missing transverse momentum are studied using the full e ± p data sample collected by the H1 experiment at HERA, corresponding to an integrated luminosity of 474 pb -1. Within the Standard Model, events with isolated leptons and missing transverse momentum mainly originate from the production of single W bosons. The total single W boson production cross section is measured as 1.14±0.25 (stat.)±0.14 (sys.) pb, in agreement with the Standard Model expectation. The data are also used to establish limits on the WW γ gauge couplings and for a measurement of the W boson polarisation. © 2009 Springer-Verlag / Società Italiana di Fisica.
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The ATLAS Collaboration

Nuclear Physics A 830:1-4 (2009) 925c-940c

Authors:

G Aad, B Abbott, J Abdallah, AA Abdelalim, A Abdesselam, O Abdinov, B Abi, M Abolins, H Abramowicz, E Acerbi, BS Acharya, DL Adams, TN Addy, J Adelman, C Adorisio, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, H Ahmed, M Ahsan, G Aielli, T Akdogan, TPA Åkesson, G Akimoto, AV Akimov, MS Alam, MA Alam, J Albert, S Albrand, M Aleksa, IN Aleksandrov, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, J Alison, M Aliyev, PP Allport, SE Allwood-Spiers, A Aloisio, R Alon, A Alonso, MG Alviggi, K Amako, C Amelung, VV Ammosov, A Amorim, G Amorós, N Amram, C Anastopoulos, CF Anders, KJ Anderson, A Andreazza, V Andrei, XS Anduaga, A Angerami, F Anghinolfi, N Anjos, A Antonaki, M Antonelli, S Antonelli, B Antunovic, F Anulli, G Arabidze, I Aracena, Y Arai, ATH Arce, JP Archambault, S Arfaoui, JF Arguin, T Argyropoulos, M Arik, AJ Armbruster, O Arnaez, C Arnault, A Artamonov, D Arutinov, M Asai, S Asai, R Asfandiyarov, S Ask, B Åsman, D Asner, L Asquith, K Assamagan, A Astbury, A Astvatsatourov, G Atoian, B Auerbach, E Auge, K Augsten, M Aurousseau
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The CMS Collaboration

Nuclear Physics A 830:1-4 (2009) 946c-956c

Authors:

D Abbaneo, G Abbiendi, M Abbrescia, B Abelev, D Acosta, JG Acosta, O Actis, N Adam, W Adam, T Adams, MR Adams, A Adiguzel, V Adler, P Adzic, L Agostino, JL Agram, M Aguilar-Benitez, D Aharoni, M Ahmad, I Ahmed, S Ahuja, N Akchurin, B Akgun, U Akgun, IV Akin, E Alagoz, C Albajar, EA Albayrak, S Albergo, M Albrow, J Alcaraz Maestre, J Alexander, T Aliev, P Allfrey, N Almeida, G Altenhöfer, I Altsybeev, RL Alvarez, B Alver, G Alverson, GA Alves, M Alwarawrah, N Amapane, F Ambroglini, C Amsler, G Anagnostou, A Anastassov, M Anderson, J Andrea, V Andreev, Y Andreev, IM Anghel, L Antonelli, Z Antunovic, L Apanasevich, G Apollinari, A Aranyi, P Arce, R Arcidiacono, MW Arenton, H Arfaei, S Argiro, K Arisaka, M Arneodo, J Asaadi, MI Asghar, S Ashby, A Ashimova, A Askew, AC Assis Jesus, M Atac, O Atramentov, A Attikis, E Auffray, A Aurisano, C Autermann, P Avery, A Avetisyan, A Ayhan, I Azhgirey, T Aziz, P Azzi, P Azzurri, M Baarmand, J Babb, N Bacchetta, W Bacchi, M Bachtis, D Baden, P Baesso, S Baffioni, G Bagliesi, P Baillon, R Bainbridge, H Bakhshiansohi, MN Bakirci, JA Bakken, M Balazs, G Ball, A Ball
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The LCFIVertex package: Vertexing, flavour tagging and vertex charge reconstruction with an ILC vertex detector

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 610:2 (2009) 573-589

Authors:

D Bailey, E Devetak, M Grimes, K Harder, S Hillert, D Jackson, T Pinto Jayawardena, B Jeffery, T Lastovicka, C Lynch, V Martin, R Walsh, P Allport, Y Banda, C Buttar, A Cheplakov, D Cussans, C Damerell, N De Groot, J Fopma, B Foster, S Galagedera, R Gao, A Gillman, J Goldstein, T Greenshaw, R Halsall, B Hawes, K Hayrapetyan, H Heath, J John, E Johnson, N Kundu, A Laing, G Lastovicka-Medin, W Lau, Y Li, A Lintern, S Mandry, P Murray, A Nichols, A Nomerotski, R Page, C Parkes, C Perry, V O'Shea, A Sopczak, K Stefanov, H Tabassam, S Thomas, T Tikkanen, R Turchetta, M Tyndel, J Velthuis, G Villani, T Wijnen, T Woolliscroft, S Worm, S Yang, Z Zhang

Abstract:

The precision measurements envisaged at the International Linear Collider (ILC) depend on excellent instrumentation and reconstruction software. The correct identification of heavy flavour jets, placing unprecedented requirements on the quality of the vertex detector, will be central for the ILC programme. This paper describes the LCFIVertex software, which provides tools for vertex finding and for identification of the flavour and charge of the leading hadron in heavy flavour jets. These tools are essential for the ongoing optimisation of the vertex detector design for linear colliders such as the ILC. The paper describes the algorithms implemented in the LCFIVertex package as well as the scope of the code and its performance for a typical vertex detector design. Crown Copyright © 2009.
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