Measurement of t(t)over-bar normalised multi-differential cross sections in pp collisions at √s=13 TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions

被引：60

作者：

Sirunyan, A. M. ^{[1
]}

Tumasyan, A. ^{[1
]}

Adam, W. ^{[2
]}

Ambrogi, F. ^{[2
]}

Asilar, E. ^{[2
]}

Bergauer, T. ^{[2
]}

Brandstetter, J. ^{[2
]}

Dragicevic, M. ^{[2
]}

Ero, J. ^{[2
]}

Del Valle, A. Escalante ^{[2
]}

Flechl, M. ^{[2
]}

Fruhwirth, R. ^{[2
,207
]}

Ghete, V. M. ^{[2
]}

Hrubec, J. ^{[2
]}

Jeitler, M. ^{[2
,207
]}

Krammer, N. ^{[2
]}

Kratschmer, I ^{[2
]}

Liko, D. ^{[2
]}

Madlener, T. ^{[2
]}

Mikulec, I ^{[2
]}

Rad, N. ^{[2
]}

Rohringer, H. ^{[2
]}

Schieck, J. ^{[2
,207
]}

Schofbeck, R. ^{[2
]}

Spanring, M. ^{[2
]}

Spitzbart, D. ^{[2
]}

Waltenberger, W. ^{[2
]}

Wittmann, J. ^{[2
]}

Wulz, C-E ^{[2
,207
]}

Zarucki, M. ^{[2
]}

Chekhovsky, V ^{[3
]}

Mossolov, V ^{[3
]}

Gonzalez, J. Suarez ^{[3
]}

De Wolf, E. A. ^{[4
]}

Di Croce, D. ^{[4
]}

Janssen, X. ^{[4
]}

Lauwers, J. ^{[4
]}

Lelek, A. ^{[4
]}

Pieters, M. ^{[4
]}

Van Haevermaet, H. ^{[4
]}

Van Mechelen, P. ^{[4
]}

Van Remortel, N. ^{[4
]}

Blekman, F. ^{[5
]}

D'Hondt, J. ^{[5
]}

De Clercq, J. ^{[5
]}

Deroover, K. ^{[5
]}

Flouris, G. ^{[5
]}

Lontkovskyi, D. ^{[5
]}

Lowette, S. ^{[5
]}

Marchesini, I ^{[5
]}

机构：

[1] Yerevan Phys Inst, Yerevan, Armenia

[2] Inst Hochenergiephys, Vienna, Austria

[3] Inst Nucl Problems, Minsk, BELARUS

[4] Univ Antwerp, Antwerp, Belgium

[5] Vrije Univ Brussel, Brussels, Belgium

[6] Univ Libre Bruxelles, Brussels, Belgium

[7] Univ Ghent, Ghent, Belgium

[8] Catholic Univ Louvain, Louvain La Neuve, Belgium

[9] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil

[10] Univ Estado Rio de Janeiro, Rio De Janeiro, Brazil

[11] Univ Estadual Paulista, Sao Paulo, Brazil

[12] Univ Fed ABC, Sao Paulo, Brazil

[13] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria

[14] Univ Sofia, Sofia, Bulgaria

[15] Beihang Univ, Beijing, Peoples R China

[16] Tsinghua Univ, Dept Phys, Beijing, Peoples R China

[17] Inst High Energy Phys, Beijing, Peoples R China

[18] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing, Peoples R China

[19] Univ Los Andes, Bogota, Colombia

[20] Univ Antioquia, Medellin, Colombia

[21] Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia

[22] Univ Split, Fac Sci, Split, Croatia

[23] Inst Rudjer Boskovic, Zagreb, Croatia

[24] Univ Cyprus, Nicosia, Cyprus

[25] Charles Univ Prague, Prague, Czech Republic

[26] Escuela Politec Nacl, Quito, Ecuador

[27] Univ San Francisco Quito, Quito, Ecuador

[28] Acad Sci Res & Technol Arab Republ Egypt, Egyptian Network High Energy Phys, Cairo, Egypt

[29] NICPB, Tallinn, Estonia

[30] Univ Helsinki, Dept Phys, Helsinki, Finland

[31] Helsinki Inst Phys, Helsinki, Finland

[32] Lappeenranta Univ Technol, Lappeenranta, Finland

[33] Univ Paris Saclay, CEA, IRFU, Gif Sur Yvette, France

[34] Inst Polytech Paris, Lab Leprince Ringuet, Ecole Polytech, CNRS,IN2P3, Paris, France

[35] Univ Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France

[36] Inst Natl Phys Nucl & Phys Particules, IN2P3, CNRS, Ctr Calcul, Villeurbanne, France

[37] Univ Lyon, Inst Phys Nucl Lyon, CNRS IN2P3, Univ Claude Bernard Lyon 1, Villeurbanne, France

[38] Georgian Tech Univ, Tbilisi, Georgia

[39] Tbilisi State Univ, Tbilisi, Georgia

[40] Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany

[41] Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany

[42] Rhein Westfal TH Aachen, Phys Inst B 3, Aachen, Germany

[43] DESY, Hamburg, Germany

[44] Univ Hamburg, Hamburg, Germany

[45] Karlsruher Inst Technol, Karlsruhe, Germany

[46] NCSR Demokritos, Inst Nucl & Particle Phys INPP, Aghia Paraskevi, Greece

[47] Natl & Kapodistrian Univ Athens, Athens, Greece

[48] Natl Tech Univ Athens, Athens, Greece

[49] Univ Ioannina, Ioannina, Greece

[50] Eotvos Lorand Univ, MTA ELTE Lendulet CMS Particle & Nucl Phys Grp, Budapest, Hungary

来源：

EUROPEAN PHYSICAL JOURNAL C | 2020年 / 80卷 / 07期

基金：

巴西圣保罗研究基金会; 英国科学技术设施理事会; 新加坡国家研究基金会; 俄罗斯基础研究基金会; 欧洲研究理事会; 奥地利科学基金会; 美国国家科学基金会; 中国国家自然科学基金; 欧盟地平线“2020”; 芬兰科学院;

关键词：

3-LOOP SPLITTING FUNCTIONS; PLUS PLUS; QCD; DENSITIES; EVOLUTION;

D O I：

10.1140/epjc/s10052-020-7917-7

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Normalised multi-differential cross sections for top quark pair (t (t) over bar) production are measured in proton-proton collisions at a centre-of-mass energy of 13 TeV using events containing two oppositely charged leptons. The analysed data were recorded with the CMS detector in 2016 and correspond to an integrated luminosity of 35.9 fb(-1). The doubledifferential t (t) over bar cross section is measured as a function of the kinematic properties of the top quark and of the t (t) over bar system at parton level in the full phase space. A triple-differential measurement is performed as a function of the invariant mass and rapidity of the t (t) over bar system and the multiplicity of additional jets at particle level. The data are compared to predictions of Monte Carlo event generators that complement next-to-leading-order (NLO) quantum chromodynamics (QCD) calculations with parton showers. Together with a fixed-order NLO QCD calculation, the triple-differential measurement is used to extract values of the strong coupling strength alpha(S) and the top quark pole mass (m(t)(pole)) using several sets of parton distribution functions (PDFs). The measurement of m(t)(pole) exploits the sensitivity of the t (t) over bar invariant mass distribution to m(t)(pole) near the production threshold. Further-more, a simultaneous fit of the PDFs, aS, and m(t)(pole) is performed at NLO, demonstrating that the new data have significant impact on the gluon PDF, and at the same time allow an accurate determination of alpha(S) and m(t)(pole). The values alpha S(mZ) = 0.1135+0.0021-0.0017 and m(t)(pole) = 170.5 +/- 0.8GeV are extracted, which account for experimental and theoretical uncertainties, the latter being estimated from NLO scale variations. Possible effects from Coulomb and soft-gluon resummation near the t (t) over bar production threshold are neglected in these parameter extractions. A rough estimate of these effects indicates an expected correction of m(t)(pole) of the order of +1 GeV, which can be regarded as additional theoretical uncertainty in the current m(t)(pole) extraction.

引用

页数：108

共 25 条

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A. M. Sirunyan
A. Tumasyan
W. Adam
F. Ambrogi
E. Asilar
T. Bergauer
J. Brandstetter
E. Brondolin
M. Dragicevic
J. Erö
M. Flechl
M. Friedl
R. Frühwirth
V. M. Ghete
J. Grossmann
J. Hrubec
M. Jeitler
A. König
N. Krammer
I. Krätschmer
D. Liko
T. Madlener
I. Mikulec
E. Pree
D. Rabady
N. Rad
H. Rohringer
J. Schieck
R. Schöfbeck
M. Spanring
D. Spitzbart
J. Strauss
W. Waltenberger
J. Wittmann
C.-E. Wulz
M. Zarucki
V. Chekhovsky
V. Mossolov
J. Suarez Gonzalez
E. A. De Wolf
X. Janssen
J. Lauwers
M. Van De Klundert
H. Van Haevermaet
P. Van Mechelen
N. Van Remortel
A. Van Spilbeeck
S. Abu Zeid
F. Blekman
J. D’Hondt
Journal of High Energy Physics, 2018 (4)

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