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A Natural Model of Spontaneous CP Violation
/ Girmohanta, Sudhakantha (YITP, Stony Brook) ; Lee, Seung J. (Korea U. ; CERN) ; Nakai, Yuichiro (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiaotong U.) ; Suzuki, Motoo (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiaotong U.)
We examine the possibility of building a natural non-supersymmetric model of spontaneous CP violation equipped with the Nelson-Barr (NB) mechanism to address the strong CP problem. Our approach is to utilize a doubly composite dynamics where the first confinement of the CFT occurs at the scale of spontaneous CP violation (SCPV) and the second confinement at the TeV scale. [...]
arXiv:2203.09002; YITP-SB-2022-10; Stony Brook preprint YITP-SB-2022-10.-
2022-12-05 - 9 p.
- Published in : JHEP 2212 (2022) 024
Fulltext: document - PDF; 2203.09002 - PDF;
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Particle Identification Using Boosted Decision Trees in the Semi-Digital Hadronic Calorimeter Prototype
/ CALICE Collaboration
The CALICE Semi-Digital Hadronic CALorimeter (SDHCAL) prototype using Glass Resistive Plate Chambers as a sensitive medium is the first technological prototype of a family of high-granularity calorimeters developed by the CALICE collaboration to equip the experiments of future leptonic colliders. It was exposed to beams of hadrons, electrons and muons several times in the CERN PS and SPS beamlines between 2012 and 2018. [...]
arXiv:2004.02972; CALICE-PUB-2020-001.-
2020-10-13 - 17 p.
- Published in : JINST 15 (2020) P10009
Fulltext: PDF;
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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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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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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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Status of the muEDM Experiment at PSI
/ Khaw, Kim Siang (Shanghai Jiao Tong U.) ; Chen, Cheng (Shanghai Jiao Tong U.) ; Giovannozzi, Massimo (CERN) ; Hu, Tianqi (Shanghai Jiao Tong U.) ; Lv, Meng (Shanghai Jiao Tong U.) ; Ng, Jun Kai (Shanghai Jiao Tong U.) ; Papa, Angela (Shanghai Jiao Tong U.) ; Schmidt-Wellenburg, Philipp (PSI, Villigen ; INFN, Pisa ; Pisa U.) ; Vitali, Bastiano (PSI, Villigen ; INFN, Pisa ; Rome U.) ; Wong, Guan Ming (Shanghai Jiao Tong U.)
/PSI muEDM Collaboration
Permanent electric dipole moments (EDMs) are excellent probes of physics beyond the Standard Model, especially on new sources of CP violation. The muon EDM has recently attracted significant attention due to discrepancies in the magnetic anomaly of the muon, as well as potential violations of lepton-flavor universality in B-meson decays. [...]
arXiv:2307.01535.-
2023-09-04 - 7 p.
- Published in : Phys. Sci. Forum: 8 (2023) , no. 1, pp. 50
Fulltext: document - PDF; 2307.01535 - PDF;
In : 23rd International Workshop on Neutrinos from Accelerators (NuFact 2022), Snowbird, Salt Lake City, Utah, United States, 30 Jul - 6 Aug 2022, pp.50
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NANOGrav results and LIGO-Virgo primordial black holes in axion-like curvaton model
/ Inomata, Keisuke (Chicago U., KICP) ; Kawasaki, Masahiro (Tokyo U., ICRR ; Tokyo U., IPMU) ; Mukaida, Kyohei (CERN ; DESY) ; Yanagida, Tsutomu T. (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiao Tong U. ; Tokyo U., IPMU)
We discuss a possible connection between the recent NANOGrav results and the primordial black holes (PBHs) for the LIGO-Virgo events. In particular, we focus on the axion-like curvaton model, which provides a sizable amount of PBHs and GWs induced by scalar perturbations around the NANOGrav frequency range. [...]
arXiv:2011.01270; CERN-TH-2020-182; DESY-20-188; DESY 20-188.-
2021-04-01 - 7 p.
- Published in : Phys. Rev. Lett. 126 (2021) 131301
Fulltext: PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF;
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Flipped ${g_\mu - 2}$
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Evans, Jason L. (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiao Tong U.) ; Nagata, Natsumi (Tokyo U.) ; Nanopoulos, Dimitri V. (Texas A-M ; Baylor U. ; HARC, Woodlands ; Athens Academy ; Athens U.) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
We analyze the possible magnitude of the supersymmetric contribution to $g_\mu - 2$ in a flipped SU(5) GUT model. Unlike other GUT models which are severely constrained by universality relations, in flipped SU(5) the U(1) gaugino mass and the soft supersymmetry-breaking masses of right-handed sleptons are unrelated to the other gaugino, slepton and squark masses. [...]
arXiv:2107.03025; KCL-PH-TH/2021-46,CERN-TH-2021-099; ACT-1-21; MI-HET-751,
UMN-TH-4018/21; FTPI-MINN-21/11.-
2021-12-07 - 10 p.
- Published in : Eur. Phys. J. C 81 (2021) 1079
Fulltext: 2107.03025 - PDF; document - PDF;
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