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CERN Document Server Pronađeno je 2,031 zapisa  1 - 10slijedećikraj  idi na zapis: Pretraživanje je potrajalo 0.50 sekundi 
1.
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Constraining Gluonic Quartic Gauge Coupling Operators with $gg \to \gamma \gamma$ / Ellis, John (CERN ; King's Coll. London ; NICPB, Tallinn) ; Ge, Shao-Feng (Tokyo U., IPMU ; UC, Berkeley)
Gluon-gluon to photon-photon scattering $gg \to \gamma\gamma$ offers to the LHC experiments a uniquely powerful probe of dimension-8 operators in the Standard Model Effective Field Theory (SMEFT) that are quadratic in both the electromagnetic and gluonic field-strength tensors, such as would appear in the Born-Infeld extension of the Standard Model (SM). We use 13-TeV ATLAS data on the production of isolated photon pairs to set lower limits on the scales of dimension-8 operators $M \gtrsim 1$~TeV, and discuss the prospective sensitivities of possible future hadron colliders..
arXiv:1802.02416; KCL-PH-TH-2018-02; CERN-TH-2018-014; IPMU-18-0022.- 2018-07-24 - 6 p. - Published in : Phys. Rev. Lett. 121 (2018) 041801 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF;
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2.
(91)
Hadron collider probes of the quartic couplings of gluons to the photon and $Z$ boson / Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Ge, Shao-Feng (Shanghai Jiaotong U. ; Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiao Tong U.) ; Ma, Kai (Shanghai Jiaotong U. ; Tsung-Dao Lee Inst., Shanghai ; HIAS, UCAS, Hangzhou ; ICTP-AP, Beijing ; Shaanxi U. Tech.)
We explore the experimental sensitivities of measuring the $gg \rightarrow Z \gamma$ process at the LHC to the dimension-8 quartic couplings of gluon pairs to the $Z$ boson and photon, in addition to comparing them with the analogous sensitivities in the $gg \to \gamma \gamma$ process. These processes can both receive contributions from 4 different CP-conserving dimension-8 operators with distinct Lorentz structures that contain a pair of gluon field strengths, $\hat G^a_{\mu \nu}$, and a pair of electroweak SU(2) gauge field strengths, $W^i_{\mu \nu}$, as well as 4 similar operators containing a pair of $\hat G^a_{\mu \nu}$ and a pair of U(1) gauge field strengths, $B_{\mu \nu}$. [...]
arXiv:2112.06729; KCL-PH-TH/2021-95; CERN-TH-2021-215.- 2022-04-21 - 28 p. - Published in : JHEP 2204 (2022) 123 Fulltext: 2112.06729 - PDF; document - PDF;
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3.
(58)
Exclusive heavy meson production in photon-photon and gluon-gluon collisions / Ecclestone, R E ; Scott, D M
DAMTP-82-17. - 1982. - 11 p.
CERN library copies
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4.
(55)
Light-by-Light Scattering at Future $e^+e^-$ Colliders / Ellis, John (King's Coll. London ; NICPB, Tallinn ; CERN) ; Mavromatos, Nick E. (King's Coll. London ; Natl. Tech. U., Athens) ; Roloff, Philipp (CERN) ; You, Tevong (CERN ; Cambridge U., DAMTP ; Cambridge U.)
We study the sensitivity of possible CLIC and FCC-ee measurements of light-by-light scattering to old and new physics, including the Heisenberg-Euler Lagrangian in the Standard Model with possible contributions from loops of additional charged particles or magnetic monopoles, the Born-Infeld extension of QED, and effective dimension-8 operators involving four electromagnetic field strengths as could appear in the Standard Model Effective Field Theory. We find that FCC-ee measurements at 365 GeV and CLIC measurements at 350 GeV would be sensitive to new physics scales of half a TeV in the dimension-8 operator coefficients, and that CLIC measurements at 1.4 TeV or 3 TeV would be sensitive to new physics scales {$\sim 2$ TeV or 5 TeV} at 95% CL, corresponding to probing loops of new particles with masses up to $\sim 3.7$ TeV {for large charges and/or multiple species}. [...]
arXiv:2203.17111; KCL-PH-TH/2022-02; CERN-TH-2022-011.- 2022-07-23 - 26 p. - Published in : Eur. Phys. J. C Fulltext: document - PDF; 2203.17111 - PDF;
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5.
(39)
Probing the Scale of New Physics in the $ZZ\gamma$ Coupling at $e^+e^-$ Colliders / Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn ; Tsung-Dao Lee Inst., Shanghai) ; Ge, Shao-Feng (Tsung-Dao Lee Inst., Shanghai ; Tokyo U., IPMU ; UC, Berkeley ; Shanghai Jiaotong U.) ; He, Hong-Jian (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiaotong U. ; Tsinghua U., Beijing ; Peking U., CHEP) ; Xiao, Rui-Qing (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiaotong U.)
The $ZZ\gamma$ triple neutral gauge couplings are absent in the Standard Model (SM) at the tree level. They receive no contributions from dimension-6 effective operators, but can arise from effective operators of dimension-8. [...]
arXiv:1902.06631; KCL-PH-TH/2019-11; CERN-TH/2019-008; CERN-TH-2019-008; IPMU19-0021.- 2020-06-09 - 32 p. - Published in : Chin. Phys. C 44 (2020) 063106 Article from SCOAP3: PDF; Fulltext: PDF;
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6.
(39)
Probing New Physics in Dimension-8 Neutral Gauge Couplings at $e^+e^-$ Colliders / Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; He, Hong-Jian (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiao Tong U. ; Tsinghua U., Beijing ; Peking U., CHEP) ; Xiao, Rui-Qing (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiaotong U.)
Neutral triple gauge couplings (nTGCs) are absent in the standard model effective theory up to dimension-6 operators, but could arise from dimension-8 effective operators. In this work, we study the pure gauge operators of dimension-8 that contribute to nTGCs and are independent of the dimension-8 operator involving the Higgs doublet. [...]
arXiv:2008.04298; KCL-PH-TH/2020-28; CERN-TH-2020-076.- 2020-10-30 - 25 p. - Published in : Sci. China Phys. Mech. Astron. 64 (2021) 221062 Fulltext: PDF;
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7.
(38)
Light-by-Light Scattering Constraint on Born-Infeld Theory / Ellis, John (King's Coll. London ; CERN) ; Mavromatos, Nick E. (King's Coll. London) ; You, Tevong (Cambridge U., DAMTP)
The recent measurement by ATLAS of light-by-light scattering in LHC Pb-Pb collisions is the first direct evidence for this basic process. We find that it requires the mass scale of a nonlinear Born-Infeld extension of QED to be $\gtrsim 100$~GeV, a much stronger constraint than those derived previously. [...]
CAVENDISH-HEP-17-04; DAMTP-2017-12; KCL-PH-TH-2017-11; CERN-TH-2017-062; arXiv:1703.08450.- 2017-06-27 - 6 p. - Published in : Phys. Rev. Lett. 118 (2017) 261802 Fulltext: PDF; Preprint: PDF;
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8.
(33)
Precision proton spectrometers for CMS / Albrow, Michael (Fermilab)
We plan to add high precision tracking- and timing-detectors at z = +/- 240 m to CMS to study exclusive processes p + p -- p + X + p at high luminosity. [...]
arXiv:1310.4529 ; EDSBLOIS-2013-42 ; EDSBLOIS-2013-42. - 2013. - 4 p.
FERMILABCONF - Full text - Fulltext
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9.
(29)
Born-Infeld monopoles and instantons / Nakamura, A ; Shiraishi, K
OCHA-PP-9 ; TMUP-HEL-90-14. - 1990. - 10 p.
CERN library copies
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10.
(28)
Photon-photon collisions / Haïssinski, J
LAL-86-16. - 1986. - 27 p.
CERN library copies
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