Measurement of tau polarisation in Z/gamma* -> tau tau decays in proton-proton collisions at root s=8 TeV with the ATLAS detector

Abstract

This paper presents a measurement of the polarisation of τ leptons produced in Z/γ∗→ττ decays which is performed with a dataset of proton—proton collisions at s√=8 TeV, corresponding to an integrated luminosity of 20.2 fb −1 recorded with the ATLAS detector at the LHC in 2012. The Z/γ∗→ττ decays are reconstructed from a hadronically decaying τ lepton with a single charged particle in the final state, accompanied by a τ lepton that decays leptonically. The τ polarisation is inferred from the relative fraction of energy carried by charged and neutral hadrons in the hadronic τ decays. The polarisation is measured in a fiducial region that corresponds to the kinematic region accessible to this analysis. The τ polarisation extracted over the full phase space within the Z/γ∗ mass range of 66 <mZ/γ∗< 116 GeV is found to be Pτ=−0.14±0.02(stat)±0.04(syst) . It is in agreement with the Standard Model prediction of Pτ=−0.1517±0.0019 , which is obtained from the ALPGEN event generator interfaced with the PYTHIA 6 parton shower modelling and the TAUOLA τ decay library.

Metadata

Item Type:	Article
Authors/Creators:	Aaboudd, M Aad, G Abbott, B Abdinov, O Abeloos, B Abidi, SH AbouZeid, OS Abraham, NL Abrainowicz, H Abreu, H Abreu, R Abulaiti, Y Acharya, BS Adachi, S Adamczykh, L Adelmanlm, J Adersberger, M Adye, T Affolder, AA Afik, Y Agatonovic-Jovin, T Agheorghiesei, C Aguilar-Saavedra, JA Ahlen, SP Ahmadov, E Aielli, G Akatsuka, S Akerstedt, H Akesson, TPA Akilli, E Akimov, AV Alberghi, GL Albert, J Albicocco, P Alconada Verzini, MJ Alderweireldt, SC Aleksa, M Aleksandrov, IN Alexa, C Alexander, G Alexopoulos, T Alhroob, M Ali, B Aliev, M Alimonti, G Alison, J Alkire, SP Allbrooke, BMM Allen, BW Allport, PP Aloisio, A Alonso, A Alonso, F Alpigiani, C Alshehri, AA Alstaty, MI Alvarez Gonzalez, B Alvarez Piqueras, D Alviggi, MG Amadio, BT Coutinho, YA Amelung, C Amidei, D Amor Dos Santos, SP Amoroso, S Amundsen, G Anastopoulos, C https://orcid.org/0000-0003-1587-5830 Ancu, LS Andari, N Andeen, T Anders, CF Anders, JK Anderson, KJ Andreazza, A Andrei, V Angelidakis, S Angelozzi, I Angerami, A Anisenkov, AV Anjos, N Annovi, A Antel, C Antonelli, M Antonov, A Antrim, DJ Anulli, F Aoki, M Aperio Bella, L Arabidze, G Arai, Y Araquea, JP Araujo Ferraz, V Arce, ATH Ardell, RE Arduh, FA Arguin, J-F Argyropoulos, S Arik, M Armbruster, AJ Armitage, LJ Arnaez, O Arnold, H Arratia, M Arslan, O Artamonov, A Artoni, G Artz, S Asai, S Asbah, N Ashkenazi, A Asquith, L Assamagan, K Astalos, R Atkinson, M Atlay, NB Augsten, K Avolio, G Axen, B Ayoub, MK Azuelos, G Baas, AE Baca, MJ Bachacou, H Bachas, K Backes, M Bagnaia, P Bahmani, M Bahrasemani, H Baines, JT Bajic, M Baker, OK Bakker, RJ Baldin, EM Balek, P Balli, F Balunas, WK Banas, E Bandyopadhyay, A Banerjee, S Bannoura, AAE Barak, L Barberio, EL Barberis, D Barbero, M Barillari, T Barisits, M-S Barkeloo, JT Barklow, T Barlow, N Barnes, SL Barnett, BM Barnett, RM Barnovska-Blenessy, Z Baroncelli, A Barone, G Barr, AJ Banana Navarro, L Barreiro, F Barreiro Guimaraes da Costa, J Bartoldus, R Barton, AE Banos, R Basalaev, A 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Black, JE Black, KM Blair, RE Blazek, T Bloch, I Blocker, C Blue, A Blumenschein, U Blunier, S Bobbink, GJ Bobrovnikov, VS Bocchetta, SS Bocci, A Bock, C Boehler, M Boerner, D Bogavac, D Bogdanchikov, AG Bohm, C Boisvert, V Bokan, P Bold, T Boldyrev, AS Bolz, AE Bomben, M Bona, M Boonekamp, M Borisov, A Borissov, G Bortfreldt, J Bortoletto, D Bortolotto, V Boscherini, D Bosman, M Sola, JDB Boudreau, J Bouhova-Thackers, EV Boumediene, D Bourdarios, C Boutles, SK Boveia, A Boyd, J Boyko, IR Bozson, AJ Bracinik, J Brandt, A Brandt, G Brandt, O Braren, F Bratzler, U Brau, B Brau, JE Madden, WDB Brendlinger, K Brennan, AJ Brenner, L Brenner, R Bressler, S Briglin, DL Bristow, TM Britton, D Britzger, D Brochu, FM Brock, I Brock, R Brooijmans, G Brooks, T Brooks, WK Brosamer, J Brost, E Broughton, MH de Renstrom, PAB Bruncko, D Bruni, A Bruni, G Bruni, LS Bruno, S Brunt, BH Bruschi, M Bruscino, N Bryant, P Bryngemark, L Buanes, T Buat, Q Buchholz, P Buckley, AG Budagov, IA Buehrers, F Bugger, 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F Alberich, LC Cerqueira, AS Cerri, A Cerrito, L Cerutti, F Cervelli, A Cetin, SA Chafaq, A Chakraborty, D Chan, SK Chan, WS Chan, YL Chang, P Chapman, JD Charlton, DG Chau, CC Barajas, CAC Che, S Cheatham, S Chegwidden, A Chekanov, S Chekulaev, SV Chelkov, GA Chelstowska, MA Chen, C Chen, C Chen, H Chen, J Chen, S Chen, S Chen, X Chen, Y Cheng, HC Cheng, HJ Cheplakov, A Cheremushkina, E El Moursli, RC Cheu, E Cheung, K Chevalier, L Chiarella, V Chiarelli, G Chiodini, G Chisholm, AS Chitan, A Chiu, YH Chizhov, MV Choi, K Chomont, AR Chouridou, S Chow, YS Christodoulou, V Chu, MC Chudoba, J Chuinard, AJ Chwastowski, JJ Chytka, L Ciftci, AK Cinca, D Cindro, V Cioara, IA Ciocio, A Cirotto, F Citron, ZH Citterio, M Ciubancan, M Clark, A Clark, BL Clark, MR Clare, PJ Clarke, RN Clement, C Coadou, Y Cobal, M Coccaro, A Cochran, J Colasurdo, L Cole, B Colijn, AP Collot, J Colombo, T Muino, PC Coniavitis, E Connell, SH Connelly, IA Constantinescu, S Conti, G Conventi, E Cooke, M Cooper-Sarkar, 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Dates:	Published: 24 February 2018 Accepted: 6 February 2018
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	04 May 2018 10:57
Last Modified:	04 May 2018 10:57
Published Version:	https://doi.org/10.1140/epjc/s10052-018-5619-1
Status:	Published
Publisher:	Springer Verlag (Germany)
Refereed:	Yes
Identification Number:	10.1140/epjc/s10052-018-5619-1
Related URLs:	Author
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:130008

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Measurement of tau polarisation in Z/gamma* -> tau tau decays in proton-proton collisions at root s=8 TeV with the ATLAS detector

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