利用ATLAS在轻子+喷注通道中，对质心能量√s = 8 TeV的质子-质子碰撞产生的[公式：见正文]事件中的玻色子极化进行测量。

Measurement of the boson polarisation in [Formula: see text] events from collisions at [Formula: see text] = 8 TeV in the lepton + jets channel with ATLAS.

作者信息

Aaboud M, Aad G, Abbott B, Abdallah J, Abdinov O, Abeloos B, AbouZeid O S, Abraham N L, Abramowicz H, Abreu H, Abreu R, Abulaiti Y, Acharya B S, Adachi S, Adamczyk L, Adams D L, Adelman J, Adomeit S, Adye T, Affolder A A, Agatonovic-Jovin T, Aguilar-Saavedra J A, Ahlen S P, Ahmadov F, Aielli G, Akerstedt H, Åkesson T P A, Akimov A V, Alberghi G L, Albert J, Albrand S, Alconada Verzini M J, Aleksa M, Aleksandrov I N, Alexa C, Alexander G, Alexopoulos T, Alhroob M, Ali B, Aliev M, Alimonti G, Alison J, Alkire S P, Allbrooke B M M, Allen B W, Allport P P, Aloisio A, Alonso A, Alonso F, Alpigiani C, Alshehri A A, Alstaty M, Alvarez Gonzalez B, Álvarez Piqueras D, Alviggi M G, Amadio B T, Amaral Coutinho Y, Amelung C, Amidei D, Amor Dos Santos S P, Amorim A, Amoroso S, Amundsen G, Anastopoulos C, Ancu L S, Andari N, Andeen T, Anders C F, Anders J K, Anderson K J, Andreazza A, Andrei V, Angelidakis S, Angelozzi I, Angerami A, Anghinolfi F, Anisenkov A V, Anjos N, Annovi A, Antel C, Antonelli 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机构信息

Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco.

CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France.

出版信息

Eur Phys J C Part Fields. 2017;77(4):264. doi: 10.1140/epjc/s10052-017-4819-4. Epub 2017 Apr 26.

This paper presents a measurement of the polarisation of bosons from [Formula: see text] decays, reconstructed in events with one high-[Formula: see text] lepton and at least four jets. Data from collisions at the LHC were collected at [Formula: see text] = 8 TeV and correspond to an integrated luminosity of 20.2 fb[Formula: see text]. The angle [Formula: see text] between the -quark from the top quark decay and a direct boson decay product in the boson rest frame is sensitive to the boson polarisation. Two different decay products are used as polarisation analysers: the charged lepton and the down-type quark for the leptonically and hadronically decaying boson, respectively. The most precise measurement of the boson polarisation via the distribution of [Formula: see text] is obtained using the leptonic analyser and events in which at least two of the jets are tagged as -quark jets. The fitted fractions of longitudinal, left- and right-handed polarisation states are [Formula: see text], [Formula: see text] and [Formula: see text], and are the most precisely measured boson polarisation fractions to date. Limits on anomalous couplings of the vertex are set.

本文展示了对[公式：见原文]衰变产生的玻色子极化的测量，这些玻色子在具有一个高[公式：见原文]轻子和至少四个喷注的事件中进行重建。在大型强子对撞机（LHC）上，以[公式：见原文]=8 TeV的能量收集了碰撞数据，对应于20.2 fb[公式：见原文]的积分亮度。在玻色子静止参考系中，顶夸克衰变产生的-夸克与直接玻色子衰变产物之间的夹角[公式：见原文]对玻色子极化敏感。两种不同的玻色子衰变产物被用作极化分析器：分别针对轻子衰变和强子衰变的玻色子，带电轻子和下型夸克。通过[公式：见原文]分布对玻色子极化进行的最精确测量是使用轻子分析器以及至少两个喷注被标记为-夸克喷注的事件获得的。纵向、左旋和右旋极化态的拟合分数分别为[公式：见原文]、[公式：见原文]和[公式：见原文]，是迄今为止测量最精确的玻色子极化分数。设定了玻色子顶点异常耦合的限制。