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Discovering true tauonium via two-photon fusion at $e^+e^-$ and hadron colliders
/ d'Enterria, David (CERN) ; Shao, Hua-Sheng (Paris, LPTHE)
The feasibility of observing true tauonium, the bound state of two tau leptons, $\mathcal{T}_0\equiv(\tau^+\tau^-)_0$, via photon-photon collisions at $e^+e^-$ colliders and at the LHC, is studied. The production cross sections of the process $\gamma\gamma\to\mathcal{T}_0\to\gamma\gamma$-- as well as those of all relevant backgrounds: spin-0 and 2 charmonium resonances decaying to diphotons, and light-by-light scattering -- are computed in the equivalent photon approximation for $e^+e^-$ collisions at BES III ($\sqrt{s} = 3.8$ GeV), Belle II ($\sqrt{s} = 10.6$ GeV), and FCC-ee ($\sqrt{s} = 91.2$ GeV), as well as for ultraperipheral p-p, p-Pb, and Pb-Pb collisions at the LHC. [...]
arXiv:2202.02316.-
2022-05-01 - 9 p.
- Published in : Phys. Rev. D 105 (2022) 093008
Fulltext: PDF;
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Forward-backward asymmetry in $B\to D^{*}\ell\nu$: One more hint for scalar leptoquarks?
/ Carvunis, Alexandre (Annecy, LAPTH) ; Crivellin, Andreas (CERN ; Zurich U. ; PSI, Villigen) ; Guadagnoli, Diego (CERN ; Annecy, LAPTH) ; Gangal, Shireen (Annecy, LAPTH)
Experimental data have provided intriguing hints for the violation of lepton flavour universality (LFU), including $B\to D^{(*)}\tau\nu/B\to D^{(*)}\ell\nu$, the anomalous magnetic moment of the muon and $b\!\to\! s\ell^+\ell^-$ with a significance of $\!>3\,\sigma$, $>\!4\,\sigma$ and $>\!5\,\sigma$, respectively. Furthermore, in a recent re-analysis of 2018 Belle data, it was found that the forward-backward asymmetry ($\Delta A_{\rm FB}$) of $B \to D^{*}\mu\bar \nu$ vs $B\to D^{*}e\bar \nu$ disagrees with the SM prediction by $\approx\!\!4\,\sigma$, providing an additional sign of LFU violation. [...]
arXiv:2106.09610; CERN-TH-2021-092; LAPTH-020/21; PSI-PR-21-12; ZU-TH 27/21.-
2022-02-01 - 7 p.
- Published in : Phys. Rev. D 105 (2022) L031701
Fulltext: PhysRevD.105.L031701 - PDF; 2106.09610 - PDF;
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Flavor Symmetries and Automatic Enhancement in the 6d Supergravity Swampland
/ Cvetic, Mirjam (Pennsylvania U. ; Maribor U. ; CERN) ; Lin, Ling (CERN) ; Turner, Andrew P. (Pennsylvania U.)
We argue for the quantum-gravitational inconsistency of certain 6d $\mathcal{N}=(1,0)$ supergravity theories, whose anomaly-free gauge algebra $\mathfrak{g}$ and hypermultiplet spectrum $M$ were observed in arxiv:2012.01437 to be realizable only as part of a larger gauge sector $(\mathfrak{g}' \supset \mathfrak{g}, M' \supset M)$ in F-theory. To detach any reference to a string theoretic method of construction, we utilize flavor symmetries to provide compelling reasons why the vast majority of such $(\mathfrak{g},M)$ theories are not compatible with quantum gravity constraints, and how the "automatic enhancement" to $(\mathfrak{g}', M')$ remedies this. [...]
arXiv:2110.00008; CERN-TH-2021-144; UPR-1315-T.-
2022-02-08 - 30 p.
- Published in : Phys. Rev. D 105 (2022) 046005
Fulltext: PDF;
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Probing Neutral Triple Gauge Couplings at the LHC and Future Hadron Colliders
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn ; Tsung-Dao Lee Inst., Shanghai ; SKLPPC, Shanghai) ; He, Hong-Jian (Tsung-Dao Lee Inst., Shanghai ; SKLPPC, Shanghai ; Tsinghua U., Beijing ; Tsinghua U., Beijing, CHEP) ; Xiao, Rui-Qing (King's Coll. London ; Tsung-Dao Lee Inst., Shanghai ; SKLPPC, Shanghai)
We study probes of neutral triple gauge couplings (nTGCs) at the LHC and the proposed 100TeV $pp$ colliders, and compare their sensitivity reaches with those of the proposed $e^+ e^-$ colliders. The nTGCs provide a unique window to the new physics beyond the Standard Model (SM) because they can arise from SM effective field theory (SMEFT) operators that respect the full electroweak gauge group $SU(2)_L\otimes U(1)_Y$ of the SM only at the level of dimension-8 or higher. [...]
arXiv:2206.11676; KCL-PH-TH/2022-35; CERN-TH-2022-089.-
2023-02-01 - 57 p.
- Published in : Phys. Rev. D 107 (2023) 035005
Fulltext: 2206.11676 - PDF; Publication - PDF;
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Fully heavy tetraquark states and their evidences in LHC observations
/ liu, Ming-Sheng (Hunan Normal U. ; Hunan, LDQSQC ; SICQEA, Changsha) ; Liu, Feng-Xiao (Hunan Normal U. ; Hunan, LDQSQC ; SICQEA, Changsha) ; Zhong, Xian-Hui (Hunan Normal U. ; Hunan, LDQSQC ; SICQEA, Changsha) ; Zhao, Qiang (Beijing, Inst. High Energy Phys. ; North China Electric Power U., Beijing ; Beijing, GUCAS ; SICQEA, Changsha)
Stimulated by the exciting progress on the observations of the fully-charmed tetraquarks at LHC, we carry out a combined analysis of the mass spectra and fall-apart decays of the $1S$-, $2S$-, and $1P$-wave $cc\bar{c}\bar{c}$ states in a nonrelativistic quark model (NRQM). It is found that the $X(6600)$ structure observed in the di-$J/\psi$ invariant mass spectrum can be explained by the $1S$-wave state $T_{(4c)0^{++}}(6550)$. [...]
arXiv:2006.11952.-
2024-04-01 - 14 p.
- Published in : Phys. Rev. D 109 (2024) 076017
Fulltext: 2006.11952 - PDF; Publication - PDF;
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The $\pi^+\pi^-$ Coulomb interaction study and its use in the data processing
/ Adeva, B. (Santiago de Compostela U.) ; Afanasyev, L. (Dubna, JINR) ; Anania, A. (INFN, Messina) ; Aogaki, S. (Bucharest, IFIN-HH) ; Benelli, A. (Prague, Tech. U.) ; Brekhovskikh, V. (Serpukhov, IHEP) ; Cechak, T. (Prague, Tech. U.) ; Chiba, M. (Tokyo Metropolitan U.) ; Chliapnikov, P. (Serpukhov, IHEP) ; Drijard, D. (Prague, Tech. U. ; CERN) et al.
In this work the Coulomb effects (Coulomb correlations) were studied using experimental $\pi^+\pi^-$ pair distributions in $Q$, the relative momentum in the pair center of mass system (c.m.s), and its projections $Q_L$ (longitudinal component) and $Q_t$ (transverse component) relative to the pair direction in the laboratory system (l.s.). The major part of the pion pairs is produced by decay of $\rho, \omega$ and $\Delta$ and other short-lived sources (Coulomb pairs). [...]
arXiv:2409.12696; CERN-EP-2023-276.-
Geneva : CERN, 2024-11-01 - 11 p.
- Published in : Phys. Rev. D 110 (2024) 092005
Draft (restricted): PDF; Fulltext: DIRAC-Coulomb-correct - PDF; 2409.12696 - PDF;
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Correlating $h\to\mu^+\mu^-$ to the Anomalous Magnetic Moment of the Muon via Leptoquarks
/ Crivellin, Andreas (CERN ; Zurich U. ; PSI, Villigen) ; Mueller, Dario (Zurich U. ; PSI, Villigen) ; Saturnino, Francesco (Bern U.)
Recently, both ATLAS and CMS measured the decay $h\to\mu^+\mu^-$, finding a signal strength with respect to the Standard Model expectation of $1.2\pm0.6$ and $1.19\substack{+0.41+0.17\\-0.39 -0.16}$, respectively. This provides, for the first time, evidence that the Standard Model Higgs couples to second generation fermions. [...]
arXiv:2008.02643; CERN-TH-2020-134; PSI-PR-20-12; ZU-TH 28/20.-
2021-07-07 - 7 p.
- Published in : Phys. Rev. Lett. 127 (2021) 021801
Fulltext from publisher: PDF; External link: CERN Courier article
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