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在[公式:见文本][公式:见文本]的质子-质子碰撞中,测量与W或Z玻色子相关联的顶夸克-反夸克对的产生。

Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at [Formula: see text][Formula: see text].

作者信息

Khachatryan V, Sirunyan A M, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Erö J, Fabjan C, Friedl M, Frühwirth R, Ghete V M, Hartl C, Hörmann N, Hrubec J, Jeitler M, Kiesenhofer W, Knünz V, Krammer M, Krätschmer I, Liko D, Mikulec I, Rabady D, Rahbaran B, Rohringer H, Schöfbeck R, Strauss J, Taurok A, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Suarez Gonzalez J, Alderweireldt S, Bansal M, Bansal S, Cornelis T, De Wolf E A, Janssen X, Knutsson A, Luyckx S, Ochesanu S, Roland B, Rougny R, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Blekman F, Blyweert S, D'Hondt J, Daci N, Heracleous N, Keaveney J, Lowette S, Maes M, Olbrechts A, Python Q, Strom D, Tavernier S, Van Doninck W, Van Mulders P, Van Onsem G P, Villella I, Caillol C, Clerbaux B, De Lentdecker G, Dobur D, Favart L, Gay A P R, Grebenyuk A, Léonard A, Mohammadi A, Perniè L, Reis T, Seva T, Thomas L, Vander Velde C, Vanlaer P, Wang J, Adler V, Beernaert K, 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Akchurin N, Cowden C, Damgov J, Dragoiu C, Dudero P R, Faulkner J, Kovitanggoon K, Kunori S, Lee S W, Libeiro T, Volobouev I, Appelt E, Delannoy A G, Greene S, Gurrola A, Johns W, Maguire C, Mao Y, Melo A, Sharma M, Sheldon P, Snook B, Tuo S, Velkovska J, Arenton M W, Boutle S, Cox B, Francis B, Goodell J, Hirosky R, Ledovskoy A, Li H, Lin C, Neu C, Wood J, Clarke C, Harr R, Karchin P E, Kottachchi Kankanamge Don C, Lamichhane P, Sturdy J, Belknap D A, Carlsmith D, Cepeda M, Dasu S, Dodd L, Duric S, Friis E, Hall-Wilton R, Herndon M, Hervé A, Klabbers P, Lanaro A, Lazaridis C, Levine A, Loveless R, Mohapatra A, Ojalvo I, Perry T, Pierro G A, Polese G, Ross I, Sarangi T, Savin A, Smith W H, Vuosalo C, Woods N, Collaboration Authorinst The Cms

机构信息

Yerevan Physics Institute, Yerevan, Armenia.

Institut für Hochenergiephysik der OeAW, Wien, Austria.

出版信息

Eur Phys J C Part Fields. 2014;74(9):3060. doi: 10.1140/epjc/s10052-014-3060-7. Epub 2014 Sep 17.

DOI:10.1140/epjc/s10052-014-3060-7
PMID:25814914
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4370853/
Abstract

A measurement of the cross section for the production of top quark-antiquark pairs ([Formula: see text]) in association with a vector boson V (W or Z) in proton-proton collisions at [Formula: see text][Formula: see text] is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb[Formula: see text] recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and [Formula: see text]) channels: a same-sign dilepton analysis targeting [Formula: see text] events, and trilepton and four-lepton analyses designed for [Formula: see text] events. In the same-sign dilepton channel, the [Formula: see text] cross section is measured as [Formula: see text], corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the [Formula: see text] cross section, [Formula: see text], is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive [Formula: see text] process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.

摘要

给出了在质子 - 质子碰撞中,质心能量为[公式:见正文][公式:见正文]时,顶夸克 - 反夸克对([公式:见正文])与矢量玻色子V(W或Z)联合产生的截面测量结果。这些结果基于用大型强子对撞机(LHC)上的CMS探测器记录的、对应于19.5飞靶积分亮度的数据集。该测量在三个轻子(e和[公式:见正文])通道中进行:一个针对[公式:见正文]事件的同号双轻子分析,以及为[公式:见正文]事件设计的三轻子和四轻子分析。在同号双轻子通道中,[公式:见正文]截面测量值为[公式:见正文],相对于仅背景假设,对应1.6个标准差的显著性。结合三轻子和四轻子通道,得到了[公式:见正文]截面的直接测量值[公式:见正文],显著性为3.1个标准差。测量得到的截面在实验不确定度范围内与标准模型预测相符。从所有三个轻子通道的组合中观察到包容性[公式:见正文]过程,显著性为3.7个标准差。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/50f3/4370853/9d4db66e24f8/10052_2014_3060_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/50f3/4370853/9536b3a4e9a4/10052_2014_3060_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/50f3/4370853/c2f6459a4cea/10052_2014_3060_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/50f3/4370853/abd658093fab/10052_2014_3060_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/50f3/4370853/2c31f8fa4249/10052_2014_3060_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/50f3/4370853/9d4db66e24f8/10052_2014_3060_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/50f3/4370853/9536b3a4e9a4/10052_2014_3060_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/50f3/4370853/c2f6459a4cea/10052_2014_3060_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/50f3/4370853/abd658093fab/10052_2014_3060_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/50f3/4370853/2c31f8fa4249/10052_2014_3060_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/50f3/4370853/9d4db66e24f8/10052_2014_3060_Fig5_HTML.jpg

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