Evidence for the spin-0 nature of the Higgs boson using ATLAS data
Evidence for the spin-0 nature of the Higgs boson using ATLAS data
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使用 ATLAS 数据证明希格斯玻色子自旋 0 性质的证据
DOI：
10.1016/j.physletb.2013.08.026
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发表时间：
2013-10-01
影响因子：
4.4
通讯作者：
Zwalinski, L.
中科院分区：
文献类型：
--
作者：
Aad, G.;Abajyan, T.;Zwalinski, L.
本文根据ATLAS实验收集的质子-质子碰撞数据，对Higgs玻色子的自旋和宇称量子数进行了研究。标准模型自旋宇称J（P）= 0（+）假设与使用Higgs玻色子衰变H -> gamma gamma，H -> ZZ* -> 4l和H -> WW* -> 1 nu 1 nu以及这些通道的组合的替代假设进行了比较。分析的数据集对应于20.7 fb（-1）的综合光度收集的质心能量的根s = 8 TeV。对于H -> ZZ* -> 4l衰变模式，包括在根s = 7 TeV处收集的对应于4.6 fb（-1）的积分光度的数据集。这些数据与标准模型J（P）= 0+希格斯玻色子的量子数是相容的，而本信中研究的所有替代假设，即一些特定的J（P）= 0（-），1（+），1（-），2（+）模型，在97.8%以上的置信水平被排除在外。这种排斥与标准模型粒子的耦合强度假设无关，在J（P）= 2（+）模型的情况下，与自旋为2的粒子的胶子融合和夸克-反夸克产生的相对比例无关。因此，这些数据为希格斯玻色子的自旋为0的性质提供了证据，正宇称是强烈的首选。(C)2013年CERN。Elsevier B. V.出版，保留所有权利。
Studies of the spin and parity quantum numbers of the Higgs boson are presented, based on protonproton collision data collected by the ATLAS experiment at the LHC. The Standard Model spin-parity J(P) = 0(+) hypothesis is compared with alternative hypotheses using the Higgs boson decays H -> gamma gamma, H -> ZZ* -> 4l and H -> WW* -> l nu l nu, as well as the combination of these channels. The analysed dataset corresponds to an integrated luminosity of 20.7 fb(-1) collected at a centre-of-mass energy of root s = 8 TeV. For the H -> ZZ* -> 4l decay mode the dataset corresponding to an integrated luminosity of 4.6 fb(-1) collected at root s = 7 TeV is included. The data are compatible with the Standard Model J(P) = 0+ quantum numbers for the Higgs boson, whereas all alternative hypotheses studied in this Letter, namely some specific J(P) = 0(-), 1(+), 1(-), 2(+) models, are excluded at confidence levels above 97.8%. This exclusion holds independently of the assumptions on the coupling strengths to the Standard Model particles and in the case of the J(P) = 2(+) model, of the relative fractions of gluon-fusion and quark-antiquark production of the spin-2 particle. The data thus provide evidence for the spin-0 nature of the Higgs boson, with positive parity being strongly preferred. (C) 2013 CERN. Published by Elsevier B.V. All rights reserved.