Measurements of top-quark pair to Z-boson cross-section ratios at √s=13 , 8, 7 TeV with the ATLAS detector
Articolo
Data di Pubblicazione:
2017
Citazione:
Measurements of top-quark pair to Z-boson cross-section ratios at √s=13 , 8, 7 TeV with the ATLAS detector / M. Aaboud, G. Aad, B. Abbott, J. Abdallah, O. Abdinov, B. Abeloos, S.H. Abidi, O. AbouZeid, N. Abraham, H. Abramowicz, H. Abreu, R. Abreu, Y. Abulaiti, B.S. Acharya, S. Adachi, L. Adamczyk, D. Adams, J. Adelman, T. Adye, T. Affolder, T. Agatonovic Jovin, C. Agheorghiesei, J.A. Aguilar Saavedra, S. Ahlen, F. Ahmadov, G. Aielli, S. Akatsuka, H. Akerstedt, T.P.A. Åkesson, A. Akimov, G.L. Alberghi, J. Albert, M.J. Alconada Verzini, M. Aleksa, I. Aleksandrov, C. Alexa, G. Alexander, T. Alexopoulos, M. Alhroob, B. Ali, M. Aliev, G. Alimonti, J. Alison, S.P. Alkire, B. Allbrooke, B.W. Allen, P. Allport, A. Aloisio, A. Alonso, F. Alonso, C. Alpigiani, A.A. Alshehri, M. Alstaty, B. Alvarez Gonzalez, D. Άlvarez Piqueras, M. Alviggi, B.T. Amadio, Y. Amaral Coutinho, C. Amelung, D. Amidei, S.P. Amor Dos Santos, A. Amorim, S. Amoroso, G. Amundsen, C. Anastopoulos, L.S. Ancu, N. Andari, T. Andeen, C.F. Anders, J.K. Anders, K. Anderson, A. Andreazza, G.V. Andrei, S. Angelidakis, I. Angelozzi, A. Angerami, F. Anghinolfi, A. Anisenkov, N. Anjos, A. Annovi, C. Antel, M. Antonelli, A. Antonov, D.J. Antrim, F. Anulli, M. Aoki, L. Aperio Bella, G. Arabidze, Y. Arai, J.P. Araque, V. Araujo Ferraz, A. Arce, F.A. Arduh, J. Arguin, S. Argyropoulos, M. Arik, A.J. Armbruster, L.J. Armitage, O. Arnaez, H. Arnold, M. Arratia, O. Arslan, A. Artamonov, G. Artoni, S. Artz, S. Asai, N. Asbah, A. Ashkenazi, B. Åsman, L. Asquith, K. Assamagan, R. Astalos, M. Atkinson, N.B. Atlay, K. Augsten, G. Avolio, B. Axen, M.K. Ayoub, G. Azuelos, A. Baas, M.J. Baca, H. Bachacou, K. Bachas, M. Backes, M. Backhaus, P. Bagiacchi, P. Bagnaia, J. Baines, M. Bajic, O.K. Baker, E. Baldin, P. Balek, T. Balestri, F. Balli, W.K. Balunas, E. Banas, S. Banerjee, A.A.E. Bannoura, L. Barak, E.L. Barberio, D. Barberis, M. Barbero, T. Barillari, M. Barisits, T. Barklow, N. Barlow, S.L. Barnes, B. Barnett, M. Barnett, Z. Barnovska Blenessy, A. Baroncelli, G. Barone, A. Barr, L. Barranco Navarro, F. Barreiro, J. Barreiro Guimarães da Costa, R. Bartoldus, A.E. Barton, P. Bartos, A. Basalaev, A. Bassalat, R. Bates, S.J. Batista, R. Batley, M. Battaglia, M. Bauce, F. Bauer, H.S. Bawa, J. Beacham, M.D. Beattie, T. Beau, P. Beauchemin, P. Bechtle, H. Beck, K. Becker, M. Becker, M. Beckingham, C. Becot, A. Beddall, A. Beddall, V. Bednyakov, M. Bedognetti, C. Bee, L. Beemster, T. Beermann, M. Begel, J.K. Behr, A.S. Bell, G. Bella, L. Bellagamba, A. Bellerive, M. Bellomo, K. Belotskiy, O. Beltramello, N. Belyaev, O. Benary, D. Benchekroun, M. Bender, K. Bendtz, N. Benekos, Y. Benhammou, E. Benhar Noccioli, J. Benitez, D. Benjamin, M. Benoit, J. Bensinger, S. Bentvelsen, L. Beresford, M. Beretta, D. Berge, E. Bergeaas Kuutmann, N. Berger, J. Beringer, S. Berlendis, N.R. Bernard, G. Bernardi, C. Bernius, F.U. Bernlochner, T. Berry, P. Berta, C. Bertella, G. Bertoli, F. Bertolucci, I.A. Bertram, C. Bertsche, D. Bertsche, G. Besjes, O. Bessidskaia Bylund, M.F. Bessner, N. Besson, C. Betancourt, A. Bethani, S. Bethke, A.J. Bevan, R. Bianchi, M. Bianco, O. Biebel, D. Biedermann, R. Bielski, N.V. Biesuz, M. Biglietti, J. Bilbao De Mendizabal, T.R.V. Billoud, H. Bilokon, M. Bindi, A. Bingul, C. Bini, S. Biondi, T. Bisanz, C. Bittrich, D.M. Bjergaard, C. Black, J. Black, K. Black, D. Blackburn, R. Blair, T. Blazek, I. Bloch, C. Blocker, A. Blue, W. Blum, U. Blumenschein, S. Blunier, G. Bobbink, V. Bobrovnikov, S.S. Bocchetta, A. Bocci, C. Bock, M. Boehler, D. Boerner, D. Bogavac, A. Bogdanchikov, C. Bohm, V. Boisvert, P. Bokan, T. Bold, A. Boldyrev, M. Bomben, M. Bona, M. Boonekamp, A. Borisov, G. Borissov, J. Bortfeldt, D. Bortoletto, V. Bortolotto, K. Bos, D. Boscherini, M. Bosman, J.D. Bossio Sola, J. Boudreau, J. Bouffard, E.V. Bouhova Thacker, D.E. Boumediene, C. Bourdarios, S.K. Boutle, A. Boveia, J. Boyd, I. Boyko, J. Bracinik, A. Brandt, G. Br
Abstract:
Ratios of top-quark pair to Z-boson cross sections measured from proton-proton collisions at the LHC centre-of-mass energies of s=13 TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given s for the two processes and at different s for each process, as well as double ratios of the two processes at different s, are evaluated. The ratios are constructed using previously published ATLAS measurements of the tt¯ 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, μ at 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 → μ+μ− channels for each s 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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
p p: scattering; p p: colliding beams; Z0: hadroproduction; top: pair production; Z0: leptonic decay; parton: distribution function; cross section: ratio; channel cross section: measured; gluon: distribution function; quantum chromodynamics: perturbation theory; perturbation theory: higher-order; higher-order: 2; ATLAS; correlation; CERN LHC Coll; phase space; experimental results; 7000 GeV-cms8000 GeV-cms13000 GeV-cms; Hadron-Hadron scattering (experiments)
Elenco autori:
M. Aaboud, G. Aad, B. Abbott, J. Abdallah, O. Abdinov, B. Abeloos, S.H. Abidi, O. AbouZeid, N. Abraham, H. Abramowicz, H. Abreu, R. Abreu, Y. Abulaiti, B.S. Acharya, S. Adachi, L. Adamczyk, D. Adams, J. Adelman, T. Adye, T. Affolder, T. Agatonovic Jovin, C. Agheorghiesei, J.A. Aguilar Saavedra, S. Ahlen, F. Ahmadov, G. Aielli, S. Akatsuka, H. Akerstedt, T.P.A. Åkesson, A. Akimov, G.L. Alberghi, J. Albert, M.J. Alconada Verzini, M. Aleksa, I. Aleksandrov, C. Alexa, G. Alexander, T. Alexopoulos, M. Alhroob, B. Ali, M. Aliev, G. Alimonti, J. Alison, S.P. Alkire, B. Allbrooke, B.W. Allen, P. Allport, A. Aloisio, A. Alonso, F. Alonso, C. Alpigiani, A.A. Alshehri, M. Alstaty, B. Alvarez Gonzalez, D. Άlvarez Piqueras, M. Alviggi, B.T. Amadio, Y. Amaral Coutinho, C. Amelung, D. Amidei, S.P. Amor Dos Santos, A. Amorim, S. Amoroso, G. Amundsen, C. Anastopoulos, L.S. Ancu, N. Andari, T. Andeen, C.F. Anders, J.K. Anders, K. Anderson, A. Andreazza, G.V. Andrei, S. Angelidakis, I. Angelozzi, A. Angerami, F. Anghinolfi, A. Anisenkov, N. Anjos, A. Annovi, C. Antel, M. Antonelli, A. Antonov, D.J. Antrim, F. Anulli, M. Aoki, L. Aperio Bella, G. Arabidze, Y. Arai, J.P. Araque, V. Araujo Ferraz, A. Arce, F.A. Arduh, J. Arguin, S. Argyropoulos, M. Arik, A.J. Armbruster, L.J. Armitage, O. Arnaez, H. Arnold, M. Arratia, O. Arslan, A. Artamonov, G. Artoni, S. Artz, S. Asai, N. Asbah, A. Ashkenazi, B. Åsman, L. Asquith, K. Assamagan, R. Astalos, M. Atkinson, N.B. Atlay, K. Augsten, G. Avolio, B. Axen, M.K. Ayoub, G. Azuelos, A. Baas, M.J. Baca, H. Bachacou, K. Bachas, M. Backes, M. Backhaus, P. Bagiacchi, P. Bagnaia, J. Baines, M. Bajic, O.K. Baker, E. Baldin, P. Balek, T. Balestri, F. Balli, W.K. Balunas, E. Banas, S. Banerjee, A.A.E. Bannoura, L. Barak, E.L. Barberio, D. Barberis, M. Barbero, T. Barillari, M. Barisits, T. Barklow, N. Barlow, S.L. Barnes, B. Barnett, M. Barnett, Z. Barnovska Blenessy, A. Baroncelli, G. Barone, A. Barr, L. Barranco Navarro, F. Barreiro, J. Barreiro Guimarães da Costa, R. Bartoldus, A.E. Barton, P. Bartos, A. Basalaev, A. Bassalat, R. Bates, S.J. Batista, R. Batley, M. Battaglia, M. Bauce, F. Bauer, H.S. Bawa, J. Beacham, M.D. Beattie, T. Beau, P. Beauchemin, P. Bechtle, H. Beck, K. Becker, M. Becker, M. Beckingham, C. Becot, A. Beddall, A. Beddall, V. Bednyakov, M. Bedognetti, C. Bee, L. Beemster, T. Beermann, M. Begel, J.K. Behr, A.S. Bell, G. Bella, L. Bellagamba, A. Bellerive, M. Bellomo, K. Belotskiy, O. Beltramello, N. Belyaev, O. Benary, D. Benchekroun, M. Bender, K. Bendtz, N. Benekos, Y. Benhammou, E. Benhar Noccioli, J. Benitez, D. Benjamin, M. Benoit, J. Bensinger, S. Bentvelsen, L. Beresford, M. Beretta, D. Berge, E. Bergeaas Kuutmann, N. Berger, J. Beringer, S. Berlendis, N.R. Bernard, G. Bernardi, C. Bernius, F.U. Bernlochner, T. Berry, P. Berta, C. Bertella, G. Bertoli, F. Bertolucci, I.A. Bertram, C. Bertsche, D. Bertsche, G. Besjes, O. Bessidskaia Bylund, M.F. Bessner, N. Besson, C. Betancourt, A. Bethani, S. Bethke, A.J. Bevan, R. Bianchi, M. Bianco, O. Biebel, D. Biedermann, R. Bielski, N.V. Biesuz, M. Biglietti, J. Bilbao De Mendizabal, T.R.V. Billoud, H. Bilokon, M. Bindi, A. Bingul, C. Bini, S. Biondi, T. Bisanz, C. Bittrich, D.M. Bjergaard, C. Black, J. Black, K. Black, D. Blackburn, R. Blair, T. Blazek, I. Bloch, C. Blocker, A. Blue, W. Blum, U. Blumenschein, S. Blunier, G. Bobbink, V. Bobrovnikov, S.S. Bocchetta, A. Bocci, C. Bock, M. Boehler, D. Boerner, D. Bogavac, A. Bogdanchikov, C. Bohm, V. Boisvert, P. Bokan, T. Bold, A. Boldyrev, M. Bomben, M. Bona, M. Boonekamp, A. Borisov, G. Borissov, J. Bortfeldt, D. Bortoletto, V. Bortolotto, K. Bos, D. Boscherini, M. Bosman, J.D. Bossio Sola, J. Boudreau, J. Bouffard, E.V. Bouhova Thacker, D.E. Boumediene, C. Bourdarios, S.K. Boutle, A. Boveia, J. Boyd, I. Boyko, J. Bracinik, A. Brandt, G. Brandt, O. Brandt, U. Bratzler, B. Brau, J. Brau, W.D. Breaden Madden, K. Brendlinger, A.J. Brennan, L. Brenner
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