Measurement of the $W$ boson polarisation in $t\bar{t}$ events from $pp$ collisions at $\sqrt{s}$ = 8 TeV in the lepton+jets channel with ATLAS

This paper presents a measurement of the polarisation of $W$ bosons from $t\bar{t}$ decays, reconstructed in events with one high-$p_{\mbox{T}}$ lepton and at least four jets. Data from $pp$ collisions at the LHC were collected at $\sqrt{s}$ = 8 TeV and correspond to an integrated luminosity of 20.2...

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Veröffentlicht in:The European physical journal. C, Particles and fields Particles and fields, 2017-04, Vol.77 (4)
Hauptverfasser: Aaboud, M, Berger, N., Burger, A.M., Delmastro, M., Di Ciaccio, L., Elles, S., Grevtsov, K., Guillemin, T., Hryn’ova, T., Jézéquel, S., Koletsou, I., Lafaye, R., Lévêque, Jérémy, Mastrandea, P., Sauvan, E., Smart, B.H., Todorov, T., Wingerter-Seez, I., Yatsenko, E., Boumediene, D., Busato, E., Calvet, D., Calvet, S., Chomont, A.R., Donini, J., Ganguly, S., Gris, Ph, Madar, R., Pallin, D., Romano Saez, S.M., Santoni, C., Simon, D., Vazeille, F., Aad, G., Alstaty, M., Barbero, M., Calandri, A., Calvet, T.P., Coadou, Y., Diaconu, C., Djama, F., Ellajosyula, V., Feligioni, L., Hadef, A., Hallewell, G.D., Hubaut, F., Kahn, S.J., Knoops, E. B. F. G., Le Guirriec, E., Liu, K., Madaffari, D., Monnier, E., Muanza, S., Nagy, E., Pralavorio, P., Rodina, Y., Rozanov, A., Talby, M., Theveneaux-Pelzer, T., Ticse Torres, R.E., Tisserant, S., Toth, J., Touchard, F., Vacavant, L., Wang, Chen, Wolff, R., Albrand, S., Berlendis, S., Bethani, A., Camincher, C., Collot, J., Crépé-Renaudin, S., Delsart, P.A., Gabaldon, C., Genest, M.H., Gradin, P.O.J., Hostachy, J.Y., Ledroit-Guillon, F., Lleres, A., Lucotte, A., Malek, F., Petit, E., Stark, J., Trocmé, B., Wu, M., Rahal, G.
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container_title The European physical journal. C, Particles and fields
container_volume 77
creator Aaboud, M
Berger, N.
Burger, A.M.
Delmastro, M.
Di Ciaccio, L.
Elles, S.
Grevtsov, K.
Guillemin, T.
Hryn’ova, T.
Jézéquel, S.
Koletsou, I.
Lafaye, R.
Lévêque, Jérémy
Mastrandea, P.
Sauvan, E.
Smart, B.H.
Todorov, T.
Wingerter-Seez, I.
Yatsenko, E.
Boumediene, D.
Busato, E.
Calvet, D.
Calvet, S.
Chomont, A.R.
Donini, J.
Ganguly, S.
Gris, Ph
Madar, R.
Pallin, D.
Romano Saez, S.M.
Santoni, C.
Simon, D.
Vazeille, F.
Aad, G.
Alstaty, M.
Barbero, M.
Calandri, A.
Calvet, T.P.
Coadou, Y.
Diaconu, C.
Djama, F.
Ellajosyula, V.
Feligioni, L.
Hadef, A.
Hallewell, G.D.
Hubaut, F.
Kahn, S.J.
Knoops, E. B. F. G.
Le Guirriec, E.
Liu, K.
Madaffari, D.
Monnier, E.
Muanza, S.
Nagy, E.
Pralavorio, P.
Rodina, Y.
Rozanov, A.
Talby, M.
Theveneaux-Pelzer, T.
Ticse Torres, R.E.
Tisserant, S.
Toth, J.
Touchard, F.
Vacavant, L.
Wang, Chen
Wolff, R.
Albrand, S.
Berlendis, S.
Bethani, A.
Camincher, C.
Collot, J.
Crépé-Renaudin, S.
Delsart, P.A.
Gabaldon, C.
Genest, M.H.
Gradin, P.O.J.
Hostachy, J.Y.
Ledroit-Guillon, F.
Lleres, A.
Lucotte, A.
Malek, F.
Petit, E.
Stark, J.
Trocmé, B.
Wu, M.
Rahal, G.
description This paper presents a measurement of the polarisation of $W$ bosons from $t\bar{t}$ decays, reconstructed in events with one high-$p_{\mbox{T}}$ lepton and at least four jets. Data from $pp$ collisions at the LHC were collected at $\sqrt{s}$ = 8 TeV and correspond to an integrated luminosity of 20.2 fb$^{-1}$. The angle $\theta^{*}$ between the $b$-quark from the top quark decay and a direct $W$ boson decay product in the $W$ boson rest frame is sensitive to the $W$ boson polarisation. Two different $W$ decay products are used as polarisation analysers: the charged lepton and the down-type quark for the leptonically and hadronically decaying $W$ boson, respectively. The most precise measurement of the $W$ boson polarisation via the distribution of $\cos{\theta^{*}}$ is obtained using the leptonic analyser and events in which at least two of the jets are tagged as $b$-quark jets. The fitted fractions of longitudinal, left- and right-handed polarisation states are $F_{\mathrm{0}}= 0.709 \pm {0.019}$, $F_{\mathrm{L}}= 0.299 \pm {0.015}$ and $F_{\mathrm{R}}= -0.008 \pm {0.014}$, and are the most precisely measured $W$ boson polarisation fractions to date. Limits on anomalous couplings of the $Wtb$ vertex are set.
doi_str_mv 10.1140/epjc/s10052-017-4819-4
format Article
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The most precise measurement of the $W$ boson polarisation via the distribution of $\cos{\theta^{*}}$ is obtained using the leptonic analyser and events in which at least two of the jets are tagged as $b$-quark jets. The fitted fractions of longitudinal, left- and right-handed polarisation states are $F_{\mathrm{0}}= 0.709 \pm {0.019}$, $F_{\mathrm{L}}= 0.299 \pm {0.015}$ and $F_{\mathrm{R}}= -0.008 \pm {0.014}$, and are the most precisely measured $W$ boson polarisation fractions to date. Limits on anomalous couplings of the $Wtb$ vertex are set.</description><identifier>ISSN: 1434-6044</identifier><identifier>EISSN: 1434-6052</identifier><identifier>DOI: 10.1140/epjc/s10052-017-4819-4</identifier><language>eng</language><publisher>United States: Springer Verlag (Germany)</publisher><subject>High Energy Physics - Experiment ; Physics ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS</subject><ispartof>The European physical journal. 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B. F. G.</creatorcontrib><creatorcontrib>Le Guirriec, E.</creatorcontrib><creatorcontrib>Liu, K.</creatorcontrib><creatorcontrib>Madaffari, D.</creatorcontrib><creatorcontrib>Monnier, E.</creatorcontrib><creatorcontrib>Muanza, S.</creatorcontrib><creatorcontrib>Nagy, E.</creatorcontrib><creatorcontrib>Pralavorio, P.</creatorcontrib><creatorcontrib>Rodina, Y.</creatorcontrib><creatorcontrib>Rozanov, A.</creatorcontrib><creatorcontrib>Talby, M.</creatorcontrib><creatorcontrib>Theveneaux-Pelzer, T.</creatorcontrib><creatorcontrib>Ticse Torres, R.E.</creatorcontrib><creatorcontrib>Tisserant, S.</creatorcontrib><creatorcontrib>Toth, J.</creatorcontrib><creatorcontrib>Touchard, F.</creatorcontrib><creatorcontrib>Vacavant, L.</creatorcontrib><creatorcontrib>Wang, Chen</creatorcontrib><creatorcontrib>Wolff, R.</creatorcontrib><creatorcontrib>Albrand, S.</creatorcontrib><creatorcontrib>Berlendis, S.</creatorcontrib><creatorcontrib>Bethani, A.</creatorcontrib><creatorcontrib>Camincher, C.</creatorcontrib><creatorcontrib>Collot, J.</creatorcontrib><creatorcontrib>Crépé-Renaudin, S.</creatorcontrib><creatorcontrib>Delsart, P.A.</creatorcontrib><creatorcontrib>Gabaldon, C.</creatorcontrib><creatorcontrib>Genest, M.H.</creatorcontrib><creatorcontrib>Gradin, P.O.J.</creatorcontrib><creatorcontrib>Hostachy, J.Y.</creatorcontrib><creatorcontrib>Ledroit-Guillon, F.</creatorcontrib><creatorcontrib>Lleres, A.</creatorcontrib><creatorcontrib>Lucotte, A.</creatorcontrib><creatorcontrib>Malek, F.</creatorcontrib><creatorcontrib>Petit, E.</creatorcontrib><creatorcontrib>Stark, J.</creatorcontrib><creatorcontrib>Trocmé, B.</creatorcontrib><creatorcontrib>Wu, M.</creatorcontrib><creatorcontrib>Rahal, G.</creatorcontrib><creatorcontrib>SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)</creatorcontrib><creatorcontrib>Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)</creatorcontrib><creatorcontrib>The Ohio State Univ., Columbus, OH (United States)</creatorcontrib><creatorcontrib>Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)</creatorcontrib><creatorcontrib>Harvard Univ., Cambridge, MA (United States)</creatorcontrib><title>Measurement of the $W$ boson polarisation in $t\bar{t}$ events from $pp$ collisions at $\sqrt{s}$ = 8 TeV in the lepton+jets channel with ATLAS</title><title>The European physical journal. C, Particles and fields</title><description>This paper presents a measurement of the polarisation of $W$ bosons from $t\bar{t}$ decays, reconstructed in events with one high-$p_{\mbox{T}}$ lepton and at least four jets. Data from $pp$ collisions at the LHC were collected at $\sqrt{s}$ = 8 TeV and correspond to an integrated luminosity of 20.2 fb$^{-1}$. The angle $\theta^{*}$ between the $b$-quark from the top quark decay and a direct $W$ boson decay product in the $W$ boson rest frame is sensitive to the $W$ boson polarisation. Two different $W$ decay products are used as polarisation analysers: the charged lepton and the down-type quark for the leptonically and hadronically decaying $W$ boson, respectively. The most precise measurement of the $W$ boson polarisation via the distribution of $\cos{\theta^{*}}$ is obtained using the leptonic analyser and events in which at least two of the jets are tagged as $b$-quark jets. The fitted fractions of longitudinal, left- and right-handed polarisation states are $F_{\mathrm{0}}= 0.709 \pm {0.019}$, $F_{\mathrm{L}}= 0.299 \pm {0.015}$ and $F_{\mathrm{R}}= -0.008 \pm {0.014}$, and are the most precisely measured $W$ boson polarisation fractions to date. Limits on anomalous couplings of the $Wtb$ vertex are set.</description><subject>High Energy Physics - Experiment</subject><subject>Physics</subject><subject>PHYSICS OF ELEMENTARY PARTICLES AND FIELDS</subject><issn>1434-6044</issn><issn>1434-6052</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNo9jl1LwzAUhosoOKd_QYL0btTlq21y4UUZ6oSKFxa9GZQ0S2hG19QmTmT4G_zLZihenXNenuflRNElgtcIUThXw0bOHYIwxQlEeUIZ4gk9iiaIEppkIT7-3yk9jc6c20AIMYVsEn0_KuHeR7VVvQdWA98qEL_GoLHO9mCwnRiNE96Ew_Qg9qtGjHv_FQO1C4YDerRbEA9DDKTtOuMC6IDwIF65t9HvXSBvAAOVejn4h_ZODd72s40KtmxF36sOfBjfgqIqi-fz6ESLzqmLvzmNqrvbarFMyqf7h0VRJm1GcJKjBmYMNhlVKVeaEs40yyRDdI1TjCVNtdCUcZmnWPEcCdakEjK9TlGTrzkh0-jqt9Y6b2onjVeylTY8I32NSM5zjgM0-4Va0dXDaLZi_KytMPWyKGvT44HUEFGEA7pD5AcmpXTP</recordid><startdate>20170426</startdate><enddate>20170426</enddate><creator>Aaboud, M</creator><creator>Berger, N.</creator><creator>Burger, A.M.</creator><creator>Delmastro, M.</creator><creator>Di Ciaccio, L.</creator><creator>Elles, S.</creator><creator>Grevtsov, K.</creator><creator>Guillemin, T.</creator><creator>Hryn’ova, T.</creator><creator>Jézéquel, S.</creator><creator>Koletsou, I.</creator><creator>Lafaye, R.</creator><creator>Lévêque, Jérémy</creator><creator>Mastrandea, P.</creator><creator>Sauvan, E.</creator><creator>Smart, B.H.</creator><creator>Todorov, T.</creator><creator>Wingerter-Seez, I.</creator><creator>Yatsenko, E.</creator><creator>Boumediene, D.</creator><creator>Busato, E.</creator><creator>Calvet, D.</creator><creator>Calvet, S.</creator><creator>Chomont, A.R.</creator><creator>Donini, J.</creator><creator>Ganguly, S.</creator><creator>Gris, Ph</creator><creator>Madar, R.</creator><creator>Pallin, D.</creator><creator>Romano Saez, S.M.</creator><creator>Santoni, C.</creator><creator>Simon, D.</creator><creator>Vazeille, F.</creator><creator>Aad, G.</creator><creator>Alstaty, M.</creator><creator>Barbero, M.</creator><creator>Calandri, A.</creator><creator>Calvet, T.P.</creator><creator>Coadou, Y.</creator><creator>Diaconu, C.</creator><creator>Djama, F.</creator><creator>Ellajosyula, V.</creator><creator>Feligioni, L.</creator><creator>Hadef, A.</creator><creator>Hallewell, G.D.</creator><creator>Hubaut, F.</creator><creator>Kahn, S.J.</creator><creator>Knoops, E. 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G.</creator><creator>Le Guirriec, E.</creator><creator>Liu, K.</creator><creator>Madaffari, D.</creator><creator>Monnier, E.</creator><creator>Muanza, S.</creator><creator>Nagy, E.</creator><creator>Pralavorio, P.</creator><creator>Rodina, Y.</creator><creator>Rozanov, A.</creator><creator>Talby, M.</creator><creator>Theveneaux-Pelzer, T.</creator><creator>Ticse Torres, R.E.</creator><creator>Tisserant, S.</creator><creator>Toth, J.</creator><creator>Touchard, F.</creator><creator>Vacavant, L.</creator><creator>Wang, Chen</creator><creator>Wolff, R.</creator><creator>Albrand, S.</creator><creator>Berlendis, S.</creator><creator>Bethani, A.</creator><creator>Camincher, C.</creator><creator>Collot, J.</creator><creator>Crépé-Renaudin, S.</creator><creator>Delsart, P.A.</creator><creator>Gabaldon, C.</creator><creator>Genest, M.H.</creator><creator>Gradin, P.O.J.</creator><creator>Hostachy, J.Y.</creator><creator>Ledroit-Guillon, F.</creator><creator>Lleres, A.</creator><creator>Lucotte, A.</creator><creator>Malek, F.</creator><creator>Petit, E.</creator><creator>Stark, J.</creator><creator>Trocmé, B.</creator><creator>Wu, M.</creator><creator>Rahal, G.</creator><general>Springer Verlag (Germany)</general><general>Springer</general><scope>1XC</scope><scope>OIOZB</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-9953-5333</orcidid><orcidid>https://orcid.org/0000-0001-9500-2487</orcidid><orcidid>https://orcid.org/0000-0001-9398-1909</orcidid><orcidid>https://orcid.org/0000-0001-8195-7004</orcidid><orcidid>https://orcid.org/0000-0001-5980-5805</orcidid><orcidid>https://orcid.org/0000-0002-2531-3463</orcidid><orcidid>https://orcid.org/0000-0002-6665-4934</orcidid><orcidid>https://orcid.org/0000-0002-4098-2024</orcidid><orcidid>https://orcid.org/0000-0002-0948-5775</orcidid><orcidid>https://orcid.org/0000-0001-5914-8614</orcidid><orcidid>https://orcid.org/0000-0001-7369-6975</orcidid></search><sort><creationdate>20170426</creationdate><title>Measurement of the $W$ boson polarisation in $t\bar{t}$ events from $pp$ collisions at $\sqrt{s}$ = 8 TeV in the lepton+jets channel with ATLAS</title><author>Aaboud, M ; Berger, N. ; Burger, A.M. ; Delmastro, M. ; Di Ciaccio, L. ; Elles, S. ; Grevtsov, K. ; Guillemin, T. ; Hryn’ova, T. ; Jézéquel, S. ; Koletsou, I. ; Lafaye, R. ; Lévêque, Jérémy ; Mastrandea, P. ; Sauvan, E. ; Smart, B.H. ; Todorov, T. ; Wingerter-Seez, I. ; Yatsenko, E. ; Boumediene, D. ; Busato, E. ; Calvet, D. ; Calvet, S. ; Chomont, A.R. ; Donini, J. ; Ganguly, S. ; Gris, Ph ; Madar, R. ; Pallin, D. ; Romano Saez, S.M. ; Santoni, C. ; Simon, D. ; Vazeille, F. ; Aad, G. ; Alstaty, M. ; Barbero, M. ; Calandri, A. ; Calvet, T.P. ; Coadou, Y. ; Diaconu, C. ; Djama, F. ; Ellajosyula, V. ; Feligioni, L. ; Hadef, A. ; Hallewell, G.D. ; Hubaut, F. ; Kahn, S.J. ; Knoops, E. 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G. ; Le Guirriec, E. ; Liu, K. ; Madaffari, D. ; Monnier, E. ; Muanza, S. ; Nagy, E. ; Pralavorio, P. ; Rodina, Y. ; Rozanov, A. ; Talby, M. ; Theveneaux-Pelzer, T. ; Ticse Torres, R.E. ; Tisserant, S. ; Toth, J. ; Touchard, F. ; Vacavant, L. ; Wang, Chen ; Wolff, R. ; Albrand, S. ; Berlendis, S. ; Bethani, A. ; Camincher, C. ; Collot, J. ; Crépé-Renaudin, S. ; Delsart, P.A. ; Gabaldon, C. ; Genest, M.H. ; Gradin, P.O.J. ; Hostachy, J.Y. ; Ledroit-Guillon, F. ; Lleres, A. ; Lucotte, A. ; Malek, F. ; Petit, E. ; Stark, J. ; Trocmé, B. ; Wu, M. ; Rahal, G.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-h632-71b0680b64e59ef4398f86c814d2522c45faf489c752e971a8b5c08fd51b7d933</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>High Energy Physics - Experiment</topic><topic>Physics</topic><topic>PHYSICS OF ELEMENTARY PARTICLES AND FIELDS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Aaboud, M</creatorcontrib><creatorcontrib>Berger, N.</creatorcontrib><creatorcontrib>Burger, A.M.</creatorcontrib><creatorcontrib>Delmastro, M.</creatorcontrib><creatorcontrib>Di Ciaccio, L.</creatorcontrib><creatorcontrib>Elles, S.</creatorcontrib><creatorcontrib>Grevtsov, K.</creatorcontrib><creatorcontrib>Guillemin, T.</creatorcontrib><creatorcontrib>Hryn’ova, T.</creatorcontrib><creatorcontrib>Jézéquel, S.</creatorcontrib><creatorcontrib>Koletsou, I.</creatorcontrib><creatorcontrib>Lafaye, R.</creatorcontrib><creatorcontrib>Lévêque, Jérémy</creatorcontrib><creatorcontrib>Mastrandea, P.</creatorcontrib><creatorcontrib>Sauvan, E.</creatorcontrib><creatorcontrib>Smart, B.H.</creatorcontrib><creatorcontrib>Todorov, T.</creatorcontrib><creatorcontrib>Wingerter-Seez, I.</creatorcontrib><creatorcontrib>Yatsenko, E.</creatorcontrib><creatorcontrib>Boumediene, D.</creatorcontrib><creatorcontrib>Busato, E.</creatorcontrib><creatorcontrib>Calvet, D.</creatorcontrib><creatorcontrib>Calvet, S.</creatorcontrib><creatorcontrib>Chomont, A.R.</creatorcontrib><creatorcontrib>Donini, J.</creatorcontrib><creatorcontrib>Ganguly, S.</creatorcontrib><creatorcontrib>Gris, Ph</creatorcontrib><creatorcontrib>Madar, R.</creatorcontrib><creatorcontrib>Pallin, D.</creatorcontrib><creatorcontrib>Romano Saez, S.M.</creatorcontrib><creatorcontrib>Santoni, C.</creatorcontrib><creatorcontrib>Simon, D.</creatorcontrib><creatorcontrib>Vazeille, F.</creatorcontrib><creatorcontrib>Aad, G.</creatorcontrib><creatorcontrib>Alstaty, M.</creatorcontrib><creatorcontrib>Barbero, M.</creatorcontrib><creatorcontrib>Calandri, A.</creatorcontrib><creatorcontrib>Calvet, T.P.</creatorcontrib><creatorcontrib>Coadou, Y.</creatorcontrib><creatorcontrib>Diaconu, C.</creatorcontrib><creatorcontrib>Djama, F.</creatorcontrib><creatorcontrib>Ellajosyula, V.</creatorcontrib><creatorcontrib>Feligioni, L.</creatorcontrib><creatorcontrib>Hadef, A.</creatorcontrib><creatorcontrib>Hallewell, G.D.</creatorcontrib><creatorcontrib>Hubaut, F.</creatorcontrib><creatorcontrib>Kahn, S.J.</creatorcontrib><creatorcontrib>Knoops, E. 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G.</creatorcontrib><creatorcontrib>Le Guirriec, E.</creatorcontrib><creatorcontrib>Liu, K.</creatorcontrib><creatorcontrib>Madaffari, D.</creatorcontrib><creatorcontrib>Monnier, E.</creatorcontrib><creatorcontrib>Muanza, S.</creatorcontrib><creatorcontrib>Nagy, E.</creatorcontrib><creatorcontrib>Pralavorio, P.</creatorcontrib><creatorcontrib>Rodina, Y.</creatorcontrib><creatorcontrib>Rozanov, A.</creatorcontrib><creatorcontrib>Talby, M.</creatorcontrib><creatorcontrib>Theveneaux-Pelzer, T.</creatorcontrib><creatorcontrib>Ticse Torres, R.E.</creatorcontrib><creatorcontrib>Tisserant, S.</creatorcontrib><creatorcontrib>Toth, J.</creatorcontrib><creatorcontrib>Touchard, F.</creatorcontrib><creatorcontrib>Vacavant, L.</creatorcontrib><creatorcontrib>Wang, Chen</creatorcontrib><creatorcontrib>Wolff, R.</creatorcontrib><creatorcontrib>Albrand, S.</creatorcontrib><creatorcontrib>Berlendis, S.</creatorcontrib><creatorcontrib>Bethani, A.</creatorcontrib><creatorcontrib>Camincher, C.</creatorcontrib><creatorcontrib>Collot, J.</creatorcontrib><creatorcontrib>Crépé-Renaudin, S.</creatorcontrib><creatorcontrib>Delsart, P.A.</creatorcontrib><creatorcontrib>Gabaldon, C.</creatorcontrib><creatorcontrib>Genest, M.H.</creatorcontrib><creatorcontrib>Gradin, P.O.J.</creatorcontrib><creatorcontrib>Hostachy, J.Y.</creatorcontrib><creatorcontrib>Ledroit-Guillon, F.</creatorcontrib><creatorcontrib>Lleres, A.</creatorcontrib><creatorcontrib>Lucotte, A.</creatorcontrib><creatorcontrib>Malek, F.</creatorcontrib><creatorcontrib>Petit, E.</creatorcontrib><creatorcontrib>Stark, J.</creatorcontrib><creatorcontrib>Trocmé, B.</creatorcontrib><creatorcontrib>Wu, M.</creatorcontrib><creatorcontrib>Rahal, G.</creatorcontrib><creatorcontrib>SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)</creatorcontrib><creatorcontrib>Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)</creatorcontrib><creatorcontrib>The Ohio State Univ., Columbus, OH (United States)</creatorcontrib><creatorcontrib>Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)</creatorcontrib><creatorcontrib>Harvard Univ., Cambridge, MA (United States)</creatorcontrib><collection>Hyper Article en Ligne (HAL)</collection><collection>OSTI.GOV - Hybrid</collection><collection>OSTI.GOV</collection><jtitle>The European physical journal. C, Particles and fields</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Aaboud, M</au><au>Berger, N.</au><au>Burger, A.M.</au><au>Delmastro, M.</au><au>Di Ciaccio, L.</au><au>Elles, S.</au><au>Grevtsov, K.</au><au>Guillemin, T.</au><au>Hryn’ova, T.</au><au>Jézéquel, S.</au><au>Koletsou, I.</au><au>Lafaye, R.</au><au>Lévêque, Jérémy</au><au>Mastrandea, P.</au><au>Sauvan, E.</au><au>Smart, B.H.</au><au>Todorov, T.</au><au>Wingerter-Seez, I.</au><au>Yatsenko, E.</au><au>Boumediene, D.</au><au>Busato, E.</au><au>Calvet, D.</au><au>Calvet, S.</au><au>Chomont, A.R.</au><au>Donini, J.</au><au>Ganguly, S.</au><au>Gris, Ph</au><au>Madar, R.</au><au>Pallin, D.</au><au>Romano Saez, S.M.</au><au>Santoni, C.</au><au>Simon, D.</au><au>Vazeille, F.</au><au>Aad, G.</au><au>Alstaty, M.</au><au>Barbero, M.</au><au>Calandri, A.</au><au>Calvet, T.P.</au><au>Coadou, Y.</au><au>Diaconu, C.</au><au>Djama, F.</au><au>Ellajosyula, V.</au><au>Feligioni, L.</au><au>Hadef, A.</au><au>Hallewell, G.D.</au><au>Hubaut, F.</au><au>Kahn, S.J.</au><au>Knoops, E. B. F. G.</au><au>Le Guirriec, E.</au><au>Liu, K.</au><au>Madaffari, D.</au><au>Monnier, E.</au><au>Muanza, S.</au><au>Nagy, E.</au><au>Pralavorio, P.</au><au>Rodina, Y.</au><au>Rozanov, A.</au><au>Talby, M.</au><au>Theveneaux-Pelzer, T.</au><au>Ticse Torres, R.E.</au><au>Tisserant, S.</au><au>Toth, J.</au><au>Touchard, F.</au><au>Vacavant, L.</au><au>Wang, Chen</au><au>Wolff, R.</au><au>Albrand, S.</au><au>Berlendis, S.</au><au>Bethani, A.</au><au>Camincher, C.</au><au>Collot, J.</au><au>Crépé-Renaudin, S.</au><au>Delsart, P.A.</au><au>Gabaldon, C.</au><au>Genest, M.H.</au><au>Gradin, P.O.J.</au><au>Hostachy, J.Y.</au><au>Ledroit-Guillon, F.</au><au>Lleres, A.</au><au>Lucotte, A.</au><au>Malek, F.</au><au>Petit, E.</au><au>Stark, J.</au><au>Trocmé, B.</au><au>Wu, M.</au><au>Rahal, G.</au><aucorp>SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)</aucorp><aucorp>Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)</aucorp><aucorp>The Ohio State Univ., Columbus, OH (United States)</aucorp><aucorp>Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)</aucorp><aucorp>Harvard Univ., Cambridge, MA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Measurement of the $W$ boson polarisation in $t\bar{t}$ events from $pp$ collisions at $\sqrt{s}$ = 8 TeV in the lepton+jets channel with ATLAS</atitle><jtitle>The European physical journal. C, Particles and fields</jtitle><date>2017-04-26</date><risdate>2017</risdate><volume>77</volume><issue>4</issue><issn>1434-6044</issn><eissn>1434-6052</eissn><abstract>This paper presents a measurement of the polarisation of $W$ bosons from $t\bar{t}$ decays, reconstructed in events with one high-$p_{\mbox{T}}$ lepton and at least four jets. Data from $pp$ collisions at the LHC were collected at $\sqrt{s}$ = 8 TeV and correspond to an integrated luminosity of 20.2 fb$^{-1}$. The angle $\theta^{*}$ between the $b$-quark from the top quark decay and a direct $W$ boson decay product in the $W$ boson rest frame is sensitive to the $W$ boson polarisation. Two different $W$ decay products are used as polarisation analysers: the charged lepton and the down-type quark for the leptonically and hadronically decaying $W$ boson, respectively. The most precise measurement of the $W$ boson polarisation via the distribution of $\cos{\theta^{*}}$ is obtained using the leptonic analyser and events in which at least two of the jets are tagged as $b$-quark jets. The fitted fractions of longitudinal, left- and right-handed polarisation states are $F_{\mathrm{0}}= 0.709 \pm {0.019}$, $F_{\mathrm{L}}= 0.299 \pm {0.015}$ and $F_{\mathrm{R}}= -0.008 \pm {0.014}$, and are the most precisely measured $W$ boson polarisation fractions to date. Limits on anomalous couplings of the $Wtb$ vertex are set.</abstract><cop>United States</cop><pub>Springer Verlag (Germany)</pub><doi>10.1140/epjc/s10052-017-4819-4</doi><orcidid>https://orcid.org/0000-0002-9953-5333</orcidid><orcidid>https://orcid.org/0000-0001-9500-2487</orcidid><orcidid>https://orcid.org/0000-0001-9398-1909</orcidid><orcidid>https://orcid.org/0000-0001-8195-7004</orcidid><orcidid>https://orcid.org/0000-0001-5980-5805</orcidid><orcidid>https://orcid.org/0000-0002-2531-3463</orcidid><orcidid>https://orcid.org/0000-0002-6665-4934</orcidid><orcidid>https://orcid.org/0000-0002-4098-2024</orcidid><orcidid>https://orcid.org/0000-0002-0948-5775</orcidid><orcidid>https://orcid.org/0000-0001-5914-8614</orcidid><orcidid>https://orcid.org/0000-0001-7369-6975</orcidid><oa>free_for_read</oa></addata></record>
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Physics
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
title Measurement of the $W$ boson polarisation in $t\bar{t}$ events from $pp$ collisions at $\sqrt{s}$ = 8 TeV in the lepton+jets channel with ATLAS
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