Search for Low-Mass Quark-Antiquark Resonances Produced in Association with a Photon at s=13 TeV
Search for Low-Mass Quark-Antiquark Resonances Produced in Association with a Photon at s=13 TeV
复制标题
搜索与 s=13-TeV 处的光子相关产生的低质量夸克-反夸克共振
DOI：
10.1103/physrevlett.123.231803
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发表时间：
2019
影响因子：
8.6
通讯作者：
Flechl, M.
中科院分区：
文献类型：
--
作者：
Sirunyan, A. M.;Tumasyan, A.;Adam, W.;Ambrogi, F.;Bergauer, T.;Brandstetter, J.;Dragicevic, M.;Erö, J.;Escalante Del Valle, A.;Flechl, M.
对衰变到夸克-反夸克对的窄的低质量共振进行了研究。这次搜索是基于欧洲核子研究中心大型强子对撞机的CMS探测器在13TeV收集的质子-质子碰撞事件。数据样本对应于2016年记录的综合光度。该研究考虑了硬光子初态辐射导致共振具有高横向动量的情况。为了研究这一过程，将共振的衰变产物重构为具有双叉子结构的单个大半径射流。该信号将被识别为喷流不变质谱图中的局域过剩。在10到125GeV的质量范围内，没有观察到这种共振的证据。在95%的置信度水平上设定了衰变到夸克对的共振的耦合强度的上限。用这种光子触发策略获得的结果首次直接约束了在强子对撞机上获得的低于50GeV的夸克-反夸克共振质量。
A search for narrow low-mass resonances decaying to quark-antiquark pairs is presented. The search is based on proton-proton collision events collected at 13 TeV by the CMS detector at the CERN LHC. The data sample corresponds to an integrated luminosity of, recorded in 2016. The search considers the case where the resonance has high transverse momentum due to initial-state radiation of a hard photon. To study this process, the decay products of the resonance are reconstructed as a single large-radius jet with two-pronged substructure. The signal would be identified as a localized excess in the jet invariant mass spectrum. No evidence for such a resonance is observed in the mass range 10 to 125 GeV. Upper limits at the 95% confidence level are set on the coupling strength of resonances decaying to quark pairs. The results obtained with this photon trigger strategy provide the first direct constraints on quark-antiquark resonance masses below 50 GeV obtained at a hadron collider.