在质心能量为[公式：见原文]的质子-质子对撞中，利用双轻子衰变道测量包含[公式：见原文]夸克喷注等具有额外喷注活动的[公式：见原文]产生。

Measurement of [Formula: see text] production with additional jet activity, including [Formula: see text] quark jets, in the dilepton decay channel using pp collisions at [Formula: see text].

作者信息

Khachatryan V, Sirunyan A M, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Erö J, Friedl M, Frühwirth R, Ghete V M, Hartl C, Hörmann N, Hrubec J, Jeitler M, Knünz V, König A, Krammer M, Krätschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rahbaran B, Rohringer H, Schieck J, Schöfbeck R, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Suarez Gonzalez J, Alderweireldt S, Cornelis T, De Wolf E A, Janssen X, Knutsson A, Lauwers J, Luyckx S, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Keaveney J, Lowette S, Moreels L, Olbrechts A, Python Q, Strom D, Tavernier S, Van Doninck W, Van Mulders P, Van Onsem G P, Van Parijs I, Barria P, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Fasanella G, Favart L, Grebenyuk A, Karapostoli G, Lenzi T, Léonard A, Maerschalk T, Marinov A, Perniè L, 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E, Delannoy A G, Greene S, Gurrola A, Janjam R, Johns W, Maguire C, Mao Y, Melo A, Ni H, Sheldon P, Snook B, Tuo S, Velkovska J, Xu Q, Arenton M W, Cox B, Francis B, Goodell J, Hirosky R, Ledovskoy A, Li H, Lin C, Neu C, Sinthuprasith T, Sun X, Wang Y, Wolfe E, Wood J, Xia F, 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, Gomber B, Grothe M, Hall-Wilton R, Herndon M, Hervé A, Klabbers P, Lanaro A, Levine A, Long K, Loveless R, Mohapatra A, Ojalvo I, Perry T, Pierro G A, Polese G, Ruggles T, Sarangi T, Savin A, Sharma A, Smith N, Smith W H, Taylor D, Woods N, Collaboration Authorinst The Cms

机构信息

Yerevan Physics Institute, Yerevan, Armenia.

Institut für Hochenergiephysik der OeAW, Vienna, Austria.

出版信息

Eur Phys J C Part Fields. 2016;76(7):379. doi: 10.1140/epjc/s10052-016-4105-x. Epub 2016 Jul 7.

Jet multiplicity distributions in top quark pair ([Formula: see text]) events are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC using a data set corresponding to an integrated luminosity of 19.7[Formula: see text]. The measurement is performed in the dilepton decay channels ([Formula: see text], [Formula: see text], and [Formula: see text]). The absolute and normalized differential cross sections for [Formula: see text] production are measured as a function of the jet multiplicity in the event for different jet transverse momentum thresholds and the kinematic properties of the leading additional jets. The differential [Formula: see text] and [Formula: see text] cross sections are presented for the first time as a function of the kinematic properties of the leading additional [Formula: see text] jets. Furthermore, the fraction of events without additional jets above a threshold is measured as a function of the transverse momenta of the leading additional jets and the scalar sum of the transverse momenta of all additional jets. The data are compared and found to be consistent with predictions from several perturbative quantum chromodynamics event generators and a next-to-leading order calculation.

利用大型强子对撞机（LHC）上的CMS探测器，在质心能量为8 TeV的质子-质子（pp）碰撞中，使用对应于19.7[公式：见原文]积分亮度的数据集，测量了顶夸克对（[公式：见原文]）事件中的喷注多重性分布。该测量在双轻子衰变通道（[公式：见原文]、[公式：见原文]和[公式：见原文]）中进行。针对不同的喷注横向动量阈值以及领先额外喷注的运动学性质，测量了[公式：见原文]产生的绝对和归一化微分截面作为事件中喷注多重性的函数。首次给出了微分[公式：见原文]和[公式：见原文]截面作为领先额外[公式：见原文]喷注运动学性质的函数。此外，测量了高于阈值且无额外喷注的事件分数作为领先额外喷注横向动量以及所有额外喷注横向动量标量和的函数。将数据进行比较，发现与几个微扰量子色动力学事件发生器的预测以及次领头阶计算结果一致。