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Ratios of top-quark pair to Z-boson cross sections measured from proton-proton-collisions at the LHC centre-of-mass energies of root S = 13 TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given root S for the two processes and at different root S , for each process, as well as double ratios of the two processes at different root S , are evaluated. The ratios are constructed using previously published ATLAS measurements of the t (t) over bar and Z-boson production cross sections, corrected to a common phase space where required, and a new analysis of Z -> l(+)l(-) where l = e, mu at root S = 13 TeV performed with data collected in 2015 with an integrated luminosity of 3.2 fb(-1). Correlations of systematic uncertainties are taken into account when evaluating the uncertainties in the ratios. The correlation model is also used to evaluate the combined cross section of the Z -> e (+) e (-) and the Z -> mu (+) mu (-) channels for each value. The results are compared to calculations performed at next-to-next-to-leading-order accuracy using recent sets of parton distribution functions. The data demonstrate significant power to constrain the gluon distribution function for the Bjorken-x values near 0.1 and the light-quark sea for x < 0.02.
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Titolo: | Measurements of top-quark pair to Z-boson cross-section ratios at root s=13, 8, 7 TeV with the ATLAS detector |
Autori: | Aaboud M Aad G Abbott B Abdallah J Abdinov O Abeloos B Abidi SH AbouZeid OS Abraham NL Abramowicz H Abreu H Abreu R Abulaiti Y Acharya BS Adachi S Adamczyk L Adams DL Adelman J Adye T Affolder AA Agatonovic Jovin T Agheorghiesei C Aguilar Saavedra JA Ahlen SP Ahmadov F Aielli G Akatsuka S Akerstedt H Aring kesson TPA Akimov AV Alberghi GL Albert J Verzini MJA 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 P Aloisio A Alonso A Alonso F Alpigiani C Alshehri AA Alstaty M Gonzalez BA Piqueras DA Alviggi MG Amadio BT Amaral Coutinho Y Amelung C Amidei D Amor Dos Santos SP Amorim A Amoroso S Amundsen G Anastopoulos C Ancu LS Andari N Andeen T Anders CF Anders JK Anderson KJ Andreazza A Andrei V Angelidakis S Angelozzi I Angerami A Anghinolfi F 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 Araque JP Araujo Ferraz V Arce ATH Arduh FA Arguin JF 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 Aring sman B 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 Backhaus M Bagiacchi P Bagnaia P Baines JT Bajic M Baker OK Baldin EM Balek P Balestri T Balli F Balunas WK Banas E Banerjee S Bannoura AAE Barak L Barberio EL Barberis D Barbero M Barillari T Barisits MS Barklow T Barlow N Barnes SL Barnett B Barnett R Barnovska Blenessy Z Baroncelli A Barone G Barr A Barranco Navarro L Barreiro F Barreiro Guimares da Costa J Bartoldus R Barton A Bartos P Basalaev A Bassalat A Bates R Batista S Batley J Battaglia M Bauce M Bauer F Bawa H Beacham J Beattie M Beau T Beauchemin P Bechtle P Beck H Becker K Becker M Beckingham M Becot C Beddall A Beddall A Bednyakov V Bedognetti M Bee CP Beemster LJ Beermann TA Begel M Behr JK Bell AS Bella G Bellagamba L Bellerive A Bellomo M Belotskiy K Beltramello O Belyaev NL Benary O Benchekroun D Bender M Bendtz K Benekos N Benhammou Y Benhar Noccioli E Benitez J Benjamin DP Benoit M Bensinger JR Bentvelsen S Beresford L Beretta M Berge D Bergeaas Kuutmann E Berger N Beringer J Berlendis S Bernard NR Bernardi G Bernius C Bernlochner FU Berry T Berta P Bertella C Bertoli G Bertolucci F Bertram I Bertsche C Bertsche D Besjes GJ Bessidskaia Bylund O Bessner M Besson N Betancourt C Bethani A Bethke S Bevan AJ Bianchi RM Bianco M Biebel O Biedermann D Bielski R Biesuz N Biglietti M Bilbao De Mendizabal J Billoud TRV Bilokon H Bindi M Bingul A Bini C Biondi S Bisanz T Bittrich C Bjergaard DM Black CW Black JE Black KM Blackburn D Blair RE Blazek T Bloch I Blocker C Blue A Blum W 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 Bomben M Bona M Boonekamp M Borisov A 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Leney KJC Lenz T Lenzi B Leone R Leone S Leonidopoulos C Leontsinis S Lerner G Leroy C Lesage AAJ Lester CG Levchenko M Leveque J Levin D Levinson LJ Levy M Lewis D Leyton M Li B Li C Li H Li L Li L Li Q Li S Li X Li Y Liang Z Liberti B Liblong A Lie K Liebal J Liebig W Limosani A Lin SC Lin TH Lindquist BE Lionti AE Lipeles E Lipniacka A Lisovyi M Liss TM Lister A Litke AM Liu B Liu H Liu H Liu J Liu JB Liu K Liu L Liu M Liu YL Liu Y Livan M Lleres A Merino JL Lloyd SL Lo Sterzo F Lobodzinska EM Loch P Loebinger FK Loew KM Loginov A Lohse T Lohwasser K Lokajicek M Long BA Long JD Long RE Longo L Looper KA Lopez JA Mateos DL Paredes BL Paz IL Solis AL Lorenz J Martinez NL Losada M Losel PJ Lou X Lounis A Love J Love PA Lu H Lu N Lubatti HJ Luci C Lucotte A Luedtke C Luehring F Lukas W Luminari L Lundberg O Lund Jensen B Luzi PM Lynn D Lysak R Lytken E Lyubushkin V Ma H Ma LL Ma Y Maccarrone G Macchiolo A Macdonald C Macek B Miguens JM Madaffari D Madar R Maddocks HJ Mader WF Madsen A 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Mullen P Mullier GA Sanchez FJM Quijada JAM Murray WJ Musheghyan H Mukinja M Myagkov AG Myska M Nachman BP Nackenhorst O Nagai K Nagai R Nagano K Nagasaka Y Nagata K Nagel M Nagy E Nairz AM Nakahama Y Nakamura K Nakamura T Nakano I Garcia RFN Narayan R Villar DIN Naryshkin I Naumann T Navarro G Nayyar R Neal HA Nechaeva PY Neep TJ Negri A Negrini M Nektarijevic S Nellist C Nelson A Nemecek S Nemethy P Nepomuceno A Nessi M Neubauer MS Neumann M Neves RM Nevski P Newman PR Manh TN Nickerson RB Nicolaidou R Nielsen J Nikolaenko V Nikolic Audit I Nikolopoulos K Nilsen JK Nilsson P Ninomiya Y Nisati A Nisius R Nobe T Noguchi Y Nomachi M Nomidis I Nooney T Nordberg M Norjoharuddeen N Novgorodova O Nowak S Nozaki M Nozka L Ntekas K Nurse E Nuti F O'Neil DCO O'Rourke AAO O'Shea V Oakham FG Oberlack H Obermann T Ocariz J Ochi A Ochoa I Ochoa Ricoux JP Oda S Odaka S Ogren H Oh A Oh SH Ohm CC Ohman H Oide H Okawa H Okumura Y Okuyama T Olariu A Seabra LFO Pino SAO Damazio DO Olszewski A Olszowska 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Scuri F Scutti F Searcy J Seema P Seidel SC Seiden A Seixas JM Sekhniaidze G Sekhon K Sekula SJ Semprini Cesari N Serfon C Serin L Serkin L Sessa M Seuster R Severini H Sfiligoj T Sforza F Sfyrla A Shabalina E Shaikh NW Shan LY Shang R Shank JT Shapiro M Shatalov PB Shaw K Shaw SM Shcherbakova A Shehu CY Shen Y Sherwood P Shi L Shimizu S Shimmin CO Shimojima M Shirabe S Shiyakova M Shlomi J Shmeleva A Saadi DS Shochet MJ Shojaii S Shope DR Shrestha S Shulga E Shupe MA Sicho P Sickles AM Sidebo PE Haddad ES Sidiropoulou O Sidorov D Sidoti A Siegert F Sijacki D Silva J Silverstein SB Simak V Simic L Simion S Simioni E Simmons B Simon M Sinervo P Sinev NB Sioli M Siragusa G Siral I Sivoklokov SY Sjolin J Skinner MB Skubic P Slater M Slavicek T Slawinska M Sliwa K Slovak R Smakhtin V Smart BH Smestad L Smiesko J Smirnov SY Smirnov Y Smirnova LN Smirnova O Smith JW Smith MNK Smith RW Smizanska M Smolek K Snesarev AA Snyder IM Snyder S Sobie R Socher F Soffer A Soh DA Sokhrannyi G Sanchez CAS Solar M Soldatov EY Soldevila U Solodkov AA Soloshenko A Solovyanov OV Solovyev V Sommer P Son H Song HY Sopczak A Sorin V Sosa D Sotiropoulou CL Soualah R Soukharev AM South D Sowden BC Spagnolo S Spalla M Spangenberg M Spano F Sperlich D Spettel F Spieker TM Spighi R Spigo G Spiller LA Spousta M Denis RDS Stabile A Stamen R Stamm S Stanecka E Stanek RW Stanescu C Stanitzki MM Stapnes S Starchenko EA Stark GH Stark J Stark SH Staroba P Starovoitov P Starz S Staszewski R Steinberg P Stelzer B Stelzer HJ Stelzer Chilton O Stenzel H Stewart GA Stillings JA Stockton MC Stoebe M Stoicea G Stolte P Stonjek S Stradling AR Straessner A Stramaglia ME Strandberg J Strandberg S Strandlie A Strauss M Strizenec P Strohmer R Strom DM Stroynowski R Strubig A Stucci SA Stugu B Styles NA Su D Su J Suchek S Sugaya Y Suk M Sulin VV Sultansoy S Sumida T Sun S Sun X Suruliz K Suster CJE Sutton MR Suzuki S Svatos M Swiatlowski M Swift SP Sykora I Sykora T Ta D Tackmann K Taenzer J Taffard A Tafirout R Taiblum N Takai H Takashima R Takeshita T Takubo Y Talby M Talyshev AA Tanaka J Tanaka M Tanaka R Tanaka S Tanioka R Tannenwald BB Araya ST Tapprogge S Tarem S Tartarelli GF Tas P Tasevsky M Tashiro T Delgado AT Tayalati Y Taylor AC Taylor GN Taylor PTE Taylor W Teixeira Dias P Temming KK Temple D Ten Kate H Teng PK Teoh JJ Tepel F Terada S Terashi K Terron J Terzo S Testa M Teuscher RJ Theveneaux Pelzer T Thomas JP Thomas Wilsker J Thompson PD Thompson AS Thomsen LA Thomson E Tibbetts MJ Torres RET Tikhomirov VO Tikhonov YA Timoshenko S Tipton P Tisserant S Todome K Todorova Nova S Tojo J Tokar S Tokushuku K Tolley E Tomlinson L Tomoto M Tompkins L Toms K Tong B Tornambe P Torrence E Torres H Pastor ET Toth J Touchard F Tovey DR Treado CJ Trefzger T Tricoli A Trigger IM Trincaz Duvoid S Tripiana MF Trischuk W Trocme B Trofymov A Troncon C Trottier McDonald M Trovatelli M Truong L Trzebinski M Trzupek A Tsang KW Tseng JCL Tsiareshka PV Tsipolitis G Tsirintanis N Tsiskaridze S Tsiskaridze V Tskhadadze EG Tsui KM Tsukerman II Tsulaia V Tsuno S Tsybychev D Tu Y Tudorache A Tudorache V Tulbure TT Tuna AN Tupputi SA Turchikhin S Turgeman D Cakir IT Turra R Tuts PM Ucchielli G Ueda I Ughetto M Ukegawa F Unal G Undrus A Unel G Ungaro FC Unno Y Unverdorben C Urban J Urquijo P Urrejola P Usai G Usui J Vacavant L Vacek V Vachon B Valderanis C Santurio EV Valencic N Valentinetti S Valero A Valery L Valkar S Ferrer JAV Van Den Wollenberg W Van Der Deijl PC van der Graaf H van Eldik N van Gemmeren P Van Nieuwkoop J van Vulpen I van Woerden MC Vanadia M Vandelli W Vanguri R Vaniachine A Vankov P Vardanyan G Vari R Varnes EW Varni C Varol T Varouchas D Vartapetian A Varvell KE Vasquez JG Vasquez GA Vazeille F Schroeder TV Veatch J Veeraraghavan V Veloce LM Veloso F Veneziano S Ventura A Venturi M Venturi N Venturini A Vercesi V Verducci M Verkerke W Vermeulen JC Vetterli MC Viazlo O Vichou I Vickey T Boeriu OEV Viehhauser GHA Viel S Vigani L Villa M Perez MV Vilucchi E Vincter MG Vinogradov VB Vishwakarma A Vittori C Vivarelli I Vlachos S Vlasak M Vogel M Vokac P Volpi G Volpi M von der Schmitt H von Toerne E Vorobel V Vorobev K Vos M Voss R Vossebeld JH Vranjes N Milosavljevic MV Vrba V Vreeswijk M Vuillermet R Vukotic I Wagner P Wagner W Wahlberg H Wahrmund S Wakabayashi J Walder J Walker R Walkowiak W Wallangen V Wang C Wang C Wang F Wang H Wang H Wang J Wang J Wang Q Wang R Wang SM Wang T Wang W Wanotayaroj C Warburton A Ward CP Wardrope DR Washbrook A Watkins PM Watson AT Watson MF Watts G Watts S Waugh BM Webb S Weber MS Weber SW Weber SA Webster JS Weidberg AR Weinert B Weingarten J Weiser C Weits H Wells P Wenaus T Wengler T Wenig S Wermes N Werner MD Werner P Wessels M Wetter J Whalen K Whallon NL Wharton AM White A White MJ White R Whiteson D Wickens FJ Wiedenmann W Wielers M Wiglesworth C Wiik Fuchs LAM Wildauer A Wilk F Wilkens HG Williams HH Williams S Willis C Willocq S Wilson JA Wingerter Seez I Winklmeier F Winston OJ Winter BT Wittgen M Wobisch M Wolf TMH Wolff R Wolter MW Wolters H Worm SD Wosiek BK Wotschack J Woudstra MJ Wozniak KW Wu M Wu M Wu SL Wu X Wu Y Wyatt TR Wynne BM Xella S Xi Z Xia L Xu D Xu L Yabsley B Yacoob S Yamaguchi D Yamaguchi Y Yamamoto A Yamamoto S Yamanaka T Yamauchi K Yamazaki Y Yan Z Yang H Yang H Yang Y Yang Z Yao WM Yap YC Yasu Y Yatsenko E Wong KHY Ye J Ye S Yeletskikh I Yildirim E Yorita K Yoshida R Yoshihara K Young C Young CJS Youssef S Yu DR Yu J Yu J Yuan L Yuen SPY Yusuff I Zabinski B Zacharis G Zaidan R Zaitsev AM Zakharchuk N Zalieckas J Zaman A Zambito S Zanzi D Zeitnitz C Zeman M Zemla A Zeng JC Zeng Q Zenin O Zenis T Zerwas D Zhang D Zhang F Zhang G Zhang H Zhang J Zhang L Zhang L Zhang M Zhang R Zhang R Zhang X Zhang Y Zhang Z Zhao X Zhao Y Zhao Z Zhemchugov A Zhong J Zhou B Zhou C Zhou L Zhou M Zhou M Zhou N Zhu C Zhu H Zhu J Zhu Y Zhuang X Zhukov K Zibell A Zieminska D Zimine NI Zimmermann C Zimmermann S Zinonos Z Zinser M Ziolkowski M Zivkovic L Zobernig G Zoccoli A zur Nedden M Zwalinski L. |
Data di pubblicazione: | 2017 |
Rivista: | |
Abstract: | Ratios of top-quark pair to Z-boson cross sections measured from proton-proton-collisions at the LHC centre-of-mass energies of root S = 13 TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given root S for the two processes and at different root S , for each process, as well as double ratios of the two processes at different root S , are evaluated. The ratios are constructed using previously published ATLAS measurements of the t (t) over bar and Z-boson production cross sections, corrected to a common phase space where required, and a new analysis of Z -> l(+)l(-) where l = e, mu at root S = 13 TeV performed with data collected in 2015 with an integrated luminosity of 3.2 fb(-1). Correlations of systematic uncertainties are taken into account when evaluating the uncertainties in the ratios. The correlation model is also used to evaluate the combined cross section of the Z -> e (+) e (-) and the Z -> mu (+) mu (-) channels for each value. The results are compared to calculations performed at next-to-next-to-leading-order accuracy using recent sets of parton distribution functions. The data demonstrate significant power to constrain the gluon distribution function for the Bjorken-x values near 0.1 and the light-quark sea for x < 0.02. |
Handle: | http://hdl.handle.net/20.500.11770/145389 |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/20.500.11770/145389
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