Publication
Measurement of $\tau $ polarisation in $Z/\gamma ^{*}\rightarrow \tau \tau $ decays in proton–proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
| dc.contributor.author | ATLAS collaboration (2896 authors) | |
| dc.contributor.author | Aguilar-Saavedra, Juan Antonio | |
| dc.contributor.author | Amor Dos Santos, Susana Patricia | |
| dc.contributor.author | Anjos, Nuno | |
| dc.contributor.author | Araque, Juan Pedro | |
| dc.contributor.author | Castro, Nuno Filipe | |
| dc.contributor.author | Conde Muiño, Patricia | |
| dc.contributor.author | Da Cunha Sargedas De Sousa, Mario Jose | |
| dc.contributor.author | Fiolhais, Miguel | |
| dc.contributor.author | Galhardo, Bruno | |
| dc.contributor.author | Gomes, Agostinho | |
| dc.contributor.author | Gonçalo, Ricardo | |
| dc.contributor.author | Jorge, Pedro | |
| dc.contributor.author | Machado Miguens, Joana | |
| dc.contributor.author | Maio, Amélia | |
| dc.contributor.author | Maneira, José | |
| dc.contributor.author | Oleiro Seabra, Luis Filipe | |
| dc.contributor.author | Onofre, António | |
| dc.contributor.author | Pedro, Rute | |
| dc.contributor.author | Santos, Helena | |
| dc.contributor.author | Saraiva, João | |
| dc.contributor.author | Silva, José | |
| dc.contributor.author | Tavares Delgado, Ademar | |
| dc.contributor.author | Veloso, Filipe | |
| dc.contributor.author | Wolters, Helmut | |
| dc.date.accessioned | 2019-02-04T13:59:46Z | |
| dc.date.available | 2019-02-04T13:59:46Z | |
| dc.date.issued | 2018-02-24 | |
| dc.date.updated | 2019-02-04T13:59:46Z | |
| dc.description.abstract | This paper presents a measurement of the polarisation of $\tau $ leptons produced in $Z/\gamma ^{*}\rightarrow \tau \tau $ decays which is performed with a dataset of proton—proton collisions at $\sqrt{s}=8$ TeV, corresponding to an integrated luminosity of 20.2 fb$^{-1}$ recorded with the ATLAS detector at the LHC in 2012. The $Z/\gamma ^{*}\rightarrow \tau \tau $ decays are reconstructed from a hadronically decaying $\tau $ lepton with a single charged particle in the final state, accompanied by a $\tau $ lepton that decays leptonically. The $\tau $ polarisation is inferred from the relative fraction of energy carried by charged and neutral hadrons in the hadronic $\tau $ decays. The polarisation is measured in a fiducial region that corresponds to the kinematic region accessible to this analysis. The $\tau $ polarisation extracted over the full phase space within the $Z/\gamma ^{*}$ mass range of 66 $< m_{Z/\gamma ^{*}} < $ 116 GeV is found to be $P_{\tau } =-0.14 \pm 0.02 (\text {stat}) \pm 0.04 (\text {syst})$ . It is in agreement with the Standard Model prediction of $P_{\tau } =-0.1517 \pm 0.0019$ , which is obtained from the ALPGEN event generator interfaced with the PYTHIA 6 parton shower modelling and the TAUOLA $\tau $ decay library. | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | Eur.Phys.J. C78 (2018) 163; DOI 10.1140/epjc/s10052-018-5619-1 | |
| dc.identifier.uri | http://dx.doi.org/10.1140/epjc/s10052-018-5619-1 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/27438 | |
| dc.language.iso | eng | |
| dc.relation | European Particle physics Latin American NETwork | |
| dc.title | Measurement of $\tau $ polarisation in $Z/\gamma ^{*}\rightarrow \tau \tau $ decays in proton–proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.awardTitle | European Particle physics Latin American NETwork | |
| oaire.awardURI | info:eu-repo/grantAgreement/EC/FP7/246806/EU | |
| oaire.fundingStream | FP7 | |
| project.funder.identifier | http://doi.org/10.13039/501100008530 | |
| project.funder.name | European Commission | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article | |
| relation.isProjectOfPublication | 4d493a4d-4c15-4e8c-a2f5-5aefa8a80db7 | |
| relation.isProjectOfPublication.latestForDiscovery | 4d493a4d-4c15-4e8c-a2f5-5aefa8a80db7 |