在[公式：见文本]的质子-质子碰撞中[公式：见文本]产生过程中喷注多重性分布的测量。

Measurement of jet multiplicity distributions in [Formula: see text] production in pp collisions at [Formula: see text].

作者信息

Chatrchyan S, 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 Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Blekman F, Blyweert S, D'Hondt J, Heracleous N, Kalogeropoulos A, Keaveney J, Kim T J, Lowette S, Maes M, Olbrechts A, Strom D, Tavernier S, Van Doninck W, Van Mulders P, Van Onsem G P, Villella I, Caillol C, Clerbaux B, De Lentdecker G, Favart L, Gay A P R, Léonard A, Marage P E, Mohammadi A, Perniè L, Reis T, Seva T, Thomas L, Vander Velde C, Vanlaer P, Wang J, Adler V, Beernaert K, Benucci 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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(8):3014. doi: 10.1140/epjc/s10052-014-3014-0. Epub 2014 Aug 20.

The normalised differential top quark-antiquark production cross section is measured as a function of the jet multiplicity in proton-proton collisions at a centre-of-mass energy of 7[Formula: see text] at the LHC with the CMS detector. The measurement is performed in both the dilepton and lepton+jets decay channels using data corresponding to an integrated luminosity of 5.0[Formula: see text]. Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the [Formula: see text] production is determined as a function of the additional jet multiplicity in the lepton+jets channel. Furthermore, the fraction of events with no additional jets is measured in the dilepton channel, as a function of the threshold on the jet transverse momentum. The measurements are compared with predictions from perturbative quantum chromodynamics and no significant deviations are observed.

利用CMS探测器，在大型强子对撞机质心能量为7[公式：见正文]的质子-质子碰撞中，测量了归一化的顶夸克-反夸克产生截面与喷注多重性的函数关系。该测量在双轻子和轻子+喷注衰变通道中进行，使用对应于5.0[公式：见正文]积分亮度的数据。通过一种将喷注与顶夸克衰变产物关联的程序，在轻子+喷注通道中确定了[公式：见正文]产生的微分截面与额外喷注多重性的函数关系。此外，在双轻子通道中测量了无额外喷注事件的比例，作为喷注横向动量阈值的函数。将测量结果与微扰量子色动力学的预测进行比较，未观察到显著偏差。