002759265 001__ 2759265
002759265 005__ 20210907043258.0
002759265 0248_ $$aoai:cds.cern.ch:2759265$$pcerncds:FULLTEXT$$pcerncds:CERN:FULLTEXT$$pcerncds:CERN
002759265 037__ $$9arXiv$$aarXiv:2011.07799$$chep-ph
002759265 035__ $$9arXiv$$aoai:arXiv.org:2011.07799
002759265 035__ $$9Inspire$$aoai:inspirehep.net:1830446$$d2021-09-06T16:12:00Z$$h2021-09-07T02:00:20Z$$mmarcxml$$ttrue$$uhttps://inspirehep.net/api/oai2d
002759265 035__ $$9Inspire$$a1830446
002759265 041__ $$aeng
002759265 100__ $$aZhu, Jian-Wen$$uUSTC, Hefei$$uHefei, CUST
002759265 245__ $$9arXiv$$aA possible interpretation for $X(6900)$ observed in four-muon final state by LHCb -- A light Higgs-like boson?
002759265 269__ $$c2020-11-16
002759265 300__ $$a13 p
002759265 500__ $$9arXiv$$a5 figures
002759265 520__ $$9arXiv$$aA peak structure of $J/\psi$ pair production around $6.9~{\rm GeV}$ was observed and analyzed by the LHCb collaboration using the Run I and II data of LHC. How to understand this peak arouses enthusiastic discussions among both theorists and experimentalists of high energy physics, because this discovery might hint something new. Overwhelming works on this topic tend to attribute the peak as a four-quark state: tetraquark or molecule. Instead, we suggest that this peak is corresponding to a fundamental Higgs-like boson with mass about $6.9~{\rm GeV}$ which is advocated by a BSM effective theory. We present a detailed analysis on both signal and SM background, including integrated cross sections and invariant mass distributions of the final-state $J/\psi$ pair. Our numerical results are well in coincidence with the experimental data, as postulating the resonance observed by LHCb to be a BSM $0^{++}$ scalar. Therefore, the peak at $M_{\text{di-}J/\psi} \sim 6.9~{\rm GeV}$ might be a hint of new physics beyond the SM whose scale is not as large as mostly expected by high energy physicists. More further works are urgently needed in both experimental and theoretical aspects to validate or negate this assumption.
002759265 540__ $$3preprint$$aarXiv nonexclusive-distrib 1.0$$uhttp://arxiv.org/licenses/nonexclusive-distrib/1.0/
002759265 65017 $$2arXiv$$ahep-ph
002759265 65017 $$2SzGeCERN$$aParticle Physics - Phenomenology
002759265 690C_ $$aCERN
002759265 690C_ $$aPREPRINT
002759265 693__ $$aCERN LHC$$eLHCb
002759265 700__ $$aGuo, [email protected]$$uXZIT, Xuzhou
002759265 700__ $$aZhang, Ren-You$$uUSTC, Hefei$$uHefei, CUST
002759265 700__ $$aMa, Wen-Gan$$uUSTC, Hefei$$uHefei, CUST
002759265 700__ $$aLi, Xue-Qian$$uNankai U.
002759265 8564_ $$82284846$$s195212$$uhttp://cds.cern.ch/record/2759265/files/2011.07799.pdf$$yFulltext
002759265 8564_ $$82284847$$s16305$$uhttp://cds.cern.ch/record/2759265/files/fig3b.png$$y00004 $\text{Di-}J/\psi$ invariant mass distribution of cross sections (upper) and event numbers (lower) for both signal and SM background for $pp \rightarrow J/\psi J/\psi \rightarrow 4\mu$ at the benchmark point $B$. $S$ and $\hat{S}$ represent the new physics signals induced by $X(6900)$ with and without interference effect, respectively.
002759265 8564_ $$82284848$$s60061$$uhttp://cds.cern.ch/record/2759265/files/fig3a.png$$y00003 $\text{Di-}J/\psi$ invariant mass distribution of cross sections (upper) and event numbers (lower) for both signal and SM background for $pp \rightarrow J/\psi J/\psi \rightarrow 4\mu$ at the benchmark point $B$. $S$ and $\hat{S}$ represent the new physics signals induced by $X(6900)$ with and without interference effect, respectively.
002759265 8564_ $$82284849$$s107240$$uhttp://cds.cern.ch/record/2759265/files/fig2.png$$y00002 Dependence of $N_{{\rm sig}}$ on the effective coupling constants $g_{ggX}$ and $g_{c\bar{c}X}$ at a combination of the luminosity of $\sqrt{s} = 7, 8$ and $13~{\rm TeV}$ LHC. The parameter space region above the red line is excluded by the experimental constraint of $\Gamma[X(6900) \rightarrow gg] + \Gamma[X(6900) \rightarrow c\bar{c}] < \Gamma[X(6900) \rightarrow all] \simeq 168~ {\rm MeV}$. The black lines stand for the experimental constraint given by the yield of $N_{{\rm sig}} = 784 \pm 148$.
002759265 8564_ $$82284850$$s8387$$uhttp://cds.cern.ch/record/2759265/files/fig1a.png$$y00000 : : $s$-channel representative Feynman diagrams induced by $X(6900)$ for $gg \rightarrow J/\psi J/\psi$.
002759265 8564_ $$82284851$$s7107$$uhttp://cds.cern.ch/record/2759265/files/fig1b.png$$y00001 : Caption not extracted
002759265 960__ $$a11
002759265 980__ $$aPREPRINT