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1.
The Forward Physics Facility at the High-Luminosity LHC / Feng, Jonathan L. (UC, Irvine) ; Kling, Felix (DESY) ; Reno, Mary Hall (Iowa U.) ; Rojo, Juan (NIKHEF, Amsterdam ; Vrije U., Amsterdam) ; Soldin, Dennis (Delaware U.) ; Anchordoqui, Luis A. (Lehman Coll.) ; Boyd, Jamie (CERN) ; Ismail, Ahmed (Oklahoma State U.) ; Harland-Lang, Lucian (Oxford U. ; Oxford U., Theor. Phys.) ; Kelly, Kevin J. (CERN) et al.
High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from the ATLAS interaction point and shielded by concrete and rock, will host a suite of experiments to probe Standard Model (SM) processes and search for physics beyond the Standard Model (BSM) [...]
arXiv:2203.05090; UCI-TR-2022-01; CERN-PBC-Notes-2022-001; INT-PUB-22-006; BONN-TH-2022-04; FERMILAB-PUB-22-094-ND-SCD-T.- Geneva : CERN, 2023-01-20 - 413 p. - Published in : J. Phys. G 50 (2023) 030501 Fulltext: FERMILAB-PUB-22-094-ND-SCD-T - PDF; 2203.05090 - PDF; blank - PDF; Fulltext from Publisher: PDF; External links: Fermilab Library Server; eConf
In : 2021 Snowmass Summer Study, Seattle, WA, United States, 11 - 20 July 2021, pp.030501
2.
Constraints on the $U(1)_L$ gauge boson in a wide mass range / Jeong, Yu Seon (IPAP, Seoul ; Yonsei U. ; KISTI, Daejeon) ; Kim, C.S. (IPAP, Seoul ; Yonsei U.) ; Lee, Hye-Sung (CERN ; IBS, Daejeon)
There is a growing interest for the search of new light gauge bosons. The small mass of a new boson can turn various kinds of low-energy experiments to a new discovery machine, depending on their couplings to the standard model particles. [...]
arXiv:1512.03179; CERN-PH-TH-2015-285; CERN-PH-TH-2015-285.- 2016-04-12 - 21 p. - Published in : Int. J. Mod. Phys. A 31 (2016) 1650059 Fulltext: PDF; External link: Preprint
3.
Low Q^2 Weak Mixing Angle Measurements and Rare Higgs Decays / Davoudiasl, Hooman (Brookhaven) ; Lee, Hye-Sung (CERN) ; Marciano, William J. (Brookhaven)
A weighted average weak mixing angle theta_W derived from relatively low Q^2 experiments is compared with the Standard Model prediction obtained from precision measurements. The approximate 1.8 sigma discrepancy is fit with an intermediate mass (~ 10-35 GeV) "dark" Z boson Z_d, corresponding to a U(1)_d gauge symmetry of hidden dark matter, which couples to our world via kinetic and Z-Z_d mass mixing. [...]
arXiv:1507.00352; CERN-PH-TH-2015-151; CERN-PH-TH-2015-151.- Geneva : CERN, 2015-09-02 - 6 p. - Published in : Phys. Rev. D 92 (2015) 055005 APS Open Access article: PDF; Fulltext: PDF; External link: Preprint
4.
Constraining Higgsino Kink Tracks from Existing LHC Searches / Jung, Sunghoon (Korea Inst. Advanced Study, Seoul) ; Lee, Hye-Sung (CERN)
Considering the supersymmetric model with the long-lived charged Higgsino, we discuss how Higgsino kink signals can show up in the latest LHC Disappearing Track (DT) and stable chargino searches. We derive constraints on the Higgsino kink signal, and characterize it in comparison to the Wino DT and the slepton kink track. [...]
arXiv:1503.00414; CERN-PH-TH-2015-039.- Geneva : CERN, 2017-04-26 - 9 p. - Published in : Int. J. Mod. Phys. A 32 (2017) 1750070 Fulltext: PDF; External links: 00000 Example decay fraction of the charged Higgsino in $\widetilde{H}^\pm \to \ell^\pm + $ neutral, with the proper decay length of the $\widetilde{H}^\pm$. Four classes of results are defined in text. The ``bad track'' and ``trackless jet'' classes are relevant to untracked signals. The $\beta \gamma$ of the Higgsino are sampled from the decay of the 500 GeV stop to the 120 GeV Higgsino.; 00006 Bounds on the stop mass {\bf (left)} and the gluino mass {\bf (right)} for the Higgsino-UDD model weakened by appearing tracks and kinks combined. Solid (dashed) lines are for $m_{\widetilde{H}^+} = 120$ (200) GeV which can be compared with standard bounds on stops 650 GeV and gluinos 1.4 TeV shown as horizontal lines. For each choice of the Higgsino mass, $c\tau (\chi^+)$ is fixed to be the maximum allowed by stable chargino searches. Blue regions are constrained from standard stop/gluino searches.; 00007 Bounds on the stop mass {\bf (left)} and the gluino mass {\bf (right)} for the Higgsino-UDD model weakened by appearing tracks and kinks combined. Solid (dashed) lines are for $m_{\widetilde{H}^+} = 120$ (200) GeV which can be compared with standard bounds on stops 650 GeV and gluinos 1.4 TeV shown as horizontal lines. For each choice of the Higgsino mass, $c\tau (\chi^+)$ is fixed to be the maximum allowed by stable chargino searches. Blue regions are constrained from standard stop/gluino searches.; 00002 Bounds on the stop mass {\bf (left)} and the gluino mass {\bf (right)} for the Higgsino-gravitino model weakened by kinks (67\% $1 \to 2$ and 33\% $1 \to 1$ kinks combined). Solid (dashed) lines are for $m_{\widetilde{H}^+} = 120$ (200) GeV which can be compared with standard bounds on stops 650 GeV and gluinos 1.4 TeV shown as horizontal lines. Blue, red, orange regions are constrained from standard searches, stable charginos from stop/gluino decays and stable charginos from direct productions, respectively.; 00003 Bounds on the stop mass {\bf (left)} and the gluino mass {\bf (right)} for the Higgsino-gravitino model weakened by kinks (67\% $1 \to 2$ and 33\% $1 \to 1$ kinks combined). Solid (dashed) lines are for $m_{\widetilde{H}^+} = 120$ (200) GeV which can be compared with standard bounds on stops 650 GeV and gluinos 1.4 TeV shown as horizontal lines. Blue, red, orange regions are constrained from standard searches, stable charginos from stop/gluino decays and stable charginos from direct productions, respectively.; 00005 {\bf (Left):} Higgsino mass splitting $\Delta m = \Delta m_{\rm tree} + \Delta m_{\rm loop}$ defined in \Eq{eq:deltam}. $M_2 = - M_1 >0$ and $\tan\beta =2$. $\mu=$120 (solid) and 200 (dashed) GeV. {\bf (Right):} The lifetime of the neutral Higgsino, $\widetilde{H}_1^0$, with the mass splitting $\Delta m$. The decay into charginos and pions, $\widetilde{H}_1^0 \to \pi^\pm \widetilde{H}^\mp$, is dominant in the shown mass range $\Delta m \geq m_{\pi^+}$.; 00000 Proper decay length of the charged Higgsino NLSP decaying to the gravitino LSP.; 00004 {\bf (Left):} Higgsino mass splitting $\Delta m = \Delta m_{\rm tree} + \Delta m_{\rm loop}$ defined in \Eq{eq:deltam}. $M_2 = - M_1 >0$ and $\tan\beta =2$. $\mu=$120 (solid) and 200 (dashed) GeV. {\bf (Right):} The lifetime of the neutral Higgsino, $\widetilde{H}_1^0$, with the mass splitting $\Delta m$. The decay into charginos and pions, $\widetilde{H}_1^0 \to \pi^\pm \widetilde{H}^\mp$, is dominant in the shown mass range $\Delta m \geq m_{\pi^+}$.; Fulltext; 00004 Constraints on the Higgsino kink from 8 TeV DT~\cite{Aad:2013yna,CMS:2014gxa} and stable chargino searches~\cite{Khachatryan:2015lla} with 20/fb. The region left to each curve is constrained. The uncertainty band is obtained by varying selection efficiencies by 50\%.; 00005 $p_T$ of the charged lepton or the quark nearest to the charged Higgsino kink after all CMS discovery cuts. It is sensitive to the NLSP-LSP mass difference. $m$(LSP) $=0$ (solid) and compressed case with $m$(Higgsino)$- m$(LSP) $\approx m_W$ (dashed) are shown for $m$(Higgsino) $=$ 300 (blue) and 600 GeV (red). All $W$ decay modes are summed.; 00003 $E_{\Delta R<0.5}$, total energy of all charged leptons and quark within $\Delta R<0.5$ of the charged Higgsino kink. Other details are as in \Fig{fig:dRmin}.; 00001 $\Delta R_{\rm min}$, the minimum $\Delta R$ between the 300 GeV charged Higgsino and charged leptons and quarks. The dilepton channel (blue) where both $W$ bosons decay to leptons and the dijet channel (red) where both $W$ decay to quarks are compared. Higgsino lifetime $c\tau = $10 cm (solid), 100 cm (dashed) and the massless LSP. The fraction of events decaying within the appropriate part of detector is shown. CMS pre-selection cuts are applied. For comparison, slepton kinks (gray) are also shown.; 00002 $p_T$ of the charged Higgsino kink. Other details are as in \Fig{fig:dRmin}.
5.
Invisible dark gauge boson search in top decays using a kinematic method / Kim, Doojin (Florida U.) ; Lee, Hye-Sung (CERN) ; Park, Myeonghun (APCTP, Pohang ; POSTECH, Pohang ; Tokyo U., IPMU)
We discuss the discovery potential of a dark force carrier ($Z'$) of very light mass, $m_{Z'} \lesssim {\cal O}(1-10)$ GeV, at hadron colliders via rare top quark decays, especially when it decays invisibly in typical search schemes. We emphasize that the top sector is promising for the discovery of new particles because top quark pairs are copiously produced at the Large Hadron Collider. [...]
arXiv:1411.0668; CERN-PH-TH-2014-209; APCTP-PRE2014-013; IPMU14-0330; CERN-PH-TH-2014-209; APCTP PRE2014-013; IPMU14-0330.- 2015-03-25 - 19 p. - Published in : JHEP 03 (2015) 134 Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
6.
Parity Violation by a Dark Gauge Boson / Lee, Hye-Sung (CERN)
We overview the dark parity violation, which means the parity violation induced by a dark gauge boson of very small mass and coupling. [...]
arXiv:1410.8435 ; CERN-PH-TH-2014-208 ; CERN-PH-TH-2014-208.
- 2014. - 6 p.
Preprint - Full text
7.
Muon g-2 Anomaly and Dark Leptonic Gauge Boson / Lee, Hye-Sung (CERN ; William-Mary Coll. ; Jefferson Lab)
One of the major motivations to search for a dark gauge boson of MeV-GeV scale is the long-standing muon g-2 anomaly. Because of active searches such as fixed target experiments and rare meson decays, the muon g-2 favored parameter region has been rapidly reduced. [...]
arXiv:1408.4256; CERN-PH-TH-2014-157.- 2014 - 5 p. - Published in : Phys. Rev. D 90 (2014) 091702 Fulltext: PDF; External link: Preprint

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