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CERN Document Server 2,049 records found  1 - 10nextend  jump to record: Search took 0.62 seconds. 
1.
(100)
Kaon mixing beyond the standard model with physical masses / Boyle, Peter A. (Brookhaven ; Edinburgh U.) ; Erben, Felix (CERN) ; Flynn, Jonathan M. (Southampton U.) ; Garron, Nicolas (Liverpool U. ; Liverpool U., Dept. Math.) ; Kettle, Julia (Edinburgh U.) ; Mukherjee, Rajnandini (Southampton U.) ; Tsang, J. Tobias (CERN) /RBC Collaboration ; UKQCD Collaboration
We present non-perturbative results for beyond the standard model kaon mixing matrix elements in the isospin symmetric limit ($m_u=m_d$) of QCD, including a complete estimate of all dominant sources of systematic error. Our results are obtained from numerical simulations of lattice QCD with $N_f = 2+1$ flavours of dynamical domain wall fermions. [...]
arXiv:2404.02297; CERN-TH-2024-040; LTH 1366.- 2024-08-01 - 31 p. - Published in : Phys. Rev. D 110 (2024) 034501 Fulltext: Publication - PDF; 2404.02297 - PDF;
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2.
(91)
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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3.
(85)
Simulating rare kaon decays $K^{+}\to\pi^{+}\ell^{+}\ell^{-}$ using domain wall lattice QCD with physical light quark masses / Boyle, P.A. (Edinburgh U. ; Brookhaven) ; Erben, F. (Edinburgh U.) ; Flynn, J.M. (Southampton U. ; U. Southampton (main)) ; Gülpers, V. (Edinburgh U.) ; Hill, R.C. (Edinburgh U. ; Southampton U.) ; Hodgson, R. (Edinburgh U.) ; Jüttner, A. (Southampton U. ; U. Southampton (main) ; CERN) ; hÓgáin, F.Ó. (Edinburgh U.) ; Portelli, A. (Edinburgh U.) ; Sachrajda, C.T. (Southampton U.) /RBC Collaboration ; UKQCD Collaboration
We report the first calculation using physical light-quark masses of the electromagnetic form factor $V(z)$ describing the long-distance contributions to the $K^+\to\pi^+\ell^+\ell^-$ decay amplitude. The calculation is performed on a 2+1 flavor domain wall fermion ensemble with inverse lattice spacing $a^{-1}=1.730(4)$GeV. [...]
arXiv:2202.08795; CERN-TH-2022-037.- 2023-01-01 - 11 p. - Published in : Phys. Rev. D Fulltext: PDF;
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4.
(80)
Open charm tetraquarks in broken SU(3)_F symmetry / Maiani, L. (Rome U. ; CERN) ; Polosa, A.D. (Rome U.) ; Riquer, V. (Rome U. ; CERN)
Prompted by a recent lattice QCD calculation, we review the SU(3) light quark flavor structure of charmed tetraquarks with spin-0 diquarks. Fermi statistics forces the three light quarks to be in the representation 3*x3*= 3+6*. [...]
arXiv:2405.08545.- 2024-08-01 - 6 p. - Published in : Phys. Rev. D 110 (2024) 034014 Fulltext: Publication - PDF; 2405.08545 - PDF;
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5.
(75)
Absorbing discretization effects with a massive renormalization scheme: The charm-quark mass / Del Debbio, Luigi (Edinburgh U.) ; Erben, Felix (CERN) ; Flynn, Jonathan M. (Southampton U.) ; Mukherjee, Rajnandini (Southampton U.) ; Tsang, J. Tobias (CERN) /RBC Collaboration ; UKQCD Collaboration
We present the first numerical implementation of the massive SMOM (mSMOM) renormalization scheme and use it to calculate the charm quark mass. Based on ensembles with three flavours of dynamical domain wall fermions with lattice spacings in the range 0.11 -- 0.08 fm, we demonstrate that the mass scale which defines the mSMOM scheme can be chosen such that the extrapolation has significantly smaller discretisation effects than the SMOM scheme. [...]
arXiv:2407.18700; CERN-TH-2024-124.- 2024-09-01 - 15 p. - Published in : Phys. Rev. D 110 (2024) 054512 Fulltext: Publication - PDF; 2407.18700 - PDF;
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6.
(65)
Beyond the standard model effective field theory with $B \rightarrow c \tau^- \overline{\nu}$ / Burgess, C.P. (McMaster U. ; Perimeter Inst. Theor. Phys. ; CERN) ; Hamoudou, Serge (Montreal U.) ; Kumar, Jacky (Montreal U. ; TUM-IAS, Munich) ; London, David (Montreal U.)
Electroweak interactions assign a central role to the gauge group $SU(2)_L \times U(1)_Y$, which is either realized linearly (SMEFT) or nonlinearly (e.g., HEFT) in the effective theory obtained when new physics above the electroweak scale is integrated out. Although the discovery of the Higgs boson has made SMEFT the default assumption, nonlinear realization remains possible. [...]
arXiv:2111.07421; UdeM-GPP-TH-21-290.- 2022-04-01 - 7 p. - Published in : Phys. Rev. D 105 (2022) 073008 Fulltext: PhysRevD.105.073008 - PDF; 2111.07421 - PDF;
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7.
(63)
Prospects for exotic $h\rightarrow 4 \tau$ decays in single and di-Higgs boson production at the LHC and future hadron colliders / Adhikary, Amit (Warsaw U. ; Bangalore, Indian Inst. Sci.) ; Banerjee, Shankha (CERN) ; Barman, Rahool Kumar (Oklahoma State U.) ; Batell, Brian (Pittsburgh U.) ; Bhattacherjee, Biplob (Bangalore, Indian Inst. Sci.) ; Bose, Camellia (Bangalore, Indian Inst. Sci.) ; Qian, Zhuoni (Hangzhou Normal U.) ; Spannowsky, Michael (Durham U., IPPP)
We study the prospects for observing exotic decays of the Standard Model Higgs boson $h$ into light beyond the Standard Model scalars $a$ with mass $m_{a} \lesssim m_{h}/2$ in the single Higgs and Higgs pair production channels at the high luminosity run of the Large Hadron Collider (HL-LHC). Discovery prospects for single Higgs production in the gluon-gluon fusion and vector boson fusion modes with the Higgs boson decaying via the exotic mode $h \to aa \to 4\tau$ are analyzed at the HL-LHC. [...]
arXiv:2211.07674.- 2024-03-01 - 35 p. - Published in : Phys. Rev. D 109 (2024) 055008 Fulltext: 2211.07674 - PDF; Publication - PDF;
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8.
(62)
Interpreting LHCb's $\Lambda_b\to \Lambda_c\tau\bar\nu$ measurement and puzzles in semileptonic $\Lambda_b$ decays / Bernlochner, Florian U. (Bonn U.) ; Ligeti, Zoltan (LBL, Berkeley ; UC, Berkeley) ; Papucci, Michele (Caltech) ; Robinson, Dean J. (LBL, Berkeley ; UC, Berkeley)
Normalizing the recent LHCb measurement of $\Lambda_b \to \Lambda_c \tau \bar\nu$ to the standard model (SM) prediction for the $\Lambda_b \to \Lambda_c \mu \bar\nu$ rate, instead of a LEP measurement, provides a more consistent comparison with the SM prediction for the lepton flavor universality ratio $R(\Lambda_c)$. This modestly increases $R(\Lambda_c)$ compared to the quoted LHCb result, such that it no longer hints at a suppression compared to the SM, which would be hard to accommodate in new physics scenarios that enhance $R(D^{(*)})$. [...]
arXiv:2206.11282; CALT-TH-2022-023.- 2023-01-01 - 3 p. - Published in : Phys. Rev. D 107 (2023) L011502 Fulltext: 2206.11282 - PDF; Publication - PDF;
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9.
(61)
Universal Pattern in Quantum Gravity at Infinite Distance / Castellano, Alberto (Madrid, Autonoma U. ; Madrid, IFT) ; Ruiz, Ignacio (Madrid, Autonoma U. ; Madrid, IFT) ; Valenzuela, Irene (Madrid, IFT ; Madrid, Autonoma U. ; CERN)
Quantum gravitational effects become significant at a cut-off species scale that can be much lower than the Planck scale whenever we get a parametrically large number of fields becoming light. This is expected to occur at any perturbative limit of an effective field theory coupled to gravity, or equivalently, at any infinite distance limit in the field space of the quantum gravity completion. [...]
arXiv:2311.01501.- 2024-05-02 - 7 p. - Published in : Phys. Rev. Lett. 132 (2024) 181601 Fulltext: 2311.01501 - PDF; Publication - PDF;
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10.
(59)
Exclusive semileptonic $B_s\to K \ell \nu$ decays on the lattice / Flynn, J.M. (Southampton U.) ; Hill, R.C. (Edinburgh U.) ; Jüttner, A. (Southampton U. ; CERN) ; Soni, A. (Brookhaven) ; Tsang, J.T. (CERN) ; Witzel, O. (U. Siegen (main)) /RBC/UKQCD Collaboration
Semileptonic $B_s \to K \ell \nu$ decays provide an alternative $b$-decay channel to determine the CKM matrix element $|V_{ub}|$, and to obtain a $R$-ratio to investigate lepton-flavor-universality violations. Results for the CKM matrix element may also shed light on the discrepancies seen between analyses of inclusive or exclusive decays. [...]
arXiv:2303.11280; CERN-TH-2023-046; FERMILAB-PUB-23-115-V; P3H-23-017; SI-HEP-2023-06.- 2023-06-01 - 30 p. - Published in : Phys. Rev. D 107 (2023) 114512 Fulltext: 2303.11280 - PDF; d680f6ddc4c976b8b66d94f169c2fb5a - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server
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