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CLIC Detector and Physics Study

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CLIC Detector and Physics Study

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2018-07-12
12:42
Conformal tracking for the CLIC detector / Leogrande, Emilia (CERN)
Conformal tracking is the novel and comprehensive tracking strategy adopted by the CLICdp Collaboration. It merges the two concepts of conformal mapping and cellular automaton, providing an efficient pattern recognition for prompt and displaced tracks, even in busy environments with 3 TeV CLIC beam-induced backgrounds. [...]
CLICdp-Conf-2018-004.- Geneva : CERN, 2018 - 12. Fulltext: PDF;
In : 4th International Workshop Connecting The Dots 2018, Seattle, Washington, 20 - 22 Mar 2018

Αναλυτική εγγραφή - Παρόμοιες εγγραφές
2018-07-06
18:04
Top-Quark Physics at the CLIC Electron-Positron Linear Collider / CLICdp Collaboration
The Compact Linear Collider (CLIC) is a proposed future high-luminosity linear electron-positron collider operating at three energy stages, with nominal centre-of-mass energies sqrt(s) = 380 GeV, 1.5 TeV, and 3 TeV. [...]
arXiv:1807.02441 ; CLICdp-Pub-2018-003 ; CLICDP-PUB-2018-003.
- 2018. - 77 p.
Full text - 00078 Distributions of the top-quark mass reconstructed from the hadronic top-quark decays for hadronic (left) and semi-leptonic (right) events, for $500\,\invfb$ at 380\,GeV CLIC. - 00089 Distributions of the top-quark mass reconstructed from the hadronic top-quark decays for hadronic (left) and semi-leptonic (right) events, for $500\,\invfb$ at 380\,GeV CLIC. - 00102 Invariant mass distribution of the top quark from the FCNC decay \tcg reconstructed at 380~GeV CLIC after selection based on the BDT response. The distribution is normalised to $500\,\invfb$ and BR(\tcg) $=10^{-3}$ for the signal events. The hatched histogram indicates the SM background contribution. - 00104 Response distribution of the BDT classifier used for the final \tch event selection at $\roots=380\,\gev$, for hadronic (left) and semi-leptonic (right) event samples. The total background (red histogram) is normalised to $500\,\invfb$ while the signal (events with a FCNC top quark decay; blue histogram) is normalised to BR(\tch)$\times$BR(\hbb) $=10^{-3}$. The hatched histogram indicates the contribution from four fermion and quark-pair backgrounds. - 00068 Cross section for the process $\epem\to\PQt\PAQt\PH$ at $\roots = 1.4\,\tev$ including the effects of initial-state radiation and beamstrahlung as a function of $\sin^{2}{\phi}$ (left). Sensitivity to the CP mixing angle $\sin^{2}{\phi}$ as a function of $\sin^{2}{\phi}$ from the $\PQt\PAQt\PH$ cross section at $\roots=1.4\,\TeV$ assuming an integrated luminosity of $1.5\,\abinv$ (right). The sensitivities for both considered final states are shown separately in addition to the combined projection. - 00103 Response distribution of the BDT classifier used for the final \tch event selection at $\roots=380\,\gev$, for hadronic (left) and semi-leptonic (right) event samples. The total background (red histogram) is normalised to $500\,\invfb$ while the signal (events with a FCNC top quark decay; blue histogram) is normalised to BR(\tch)$\times$BR(\hbb) $=10^{-3}$. The hatched histogram indicates the contribution from four fermion and quark-pair backgrounds. - 00106 Limits at 95\% C.L. on the top quark FCNC decay \tcx\, expected for 500\,fb$^{-1}$ collected at 380~GeV CLIC with -80\% electron beam polarisation, as a function of the assumed mass of the invisible decay product, $\text{m}_\text{DM}$. Limits are calculated from the BDT response distribution in the $\pm$30~GeV window in the reconstructed particle mass. Two BDT algorithms are trained separately for low and high mass range. - 00080 The $\rootsprime$ distribution for $\ttbar$ events at $\roots=1.4\,(3)\,\TeV$ in blue (red), including QED ISR, electroweak corrections, and the CLIC luminosity spectrum. - 00099 Invariant mass distribution of the top quark from the FCNC decay \tcg reconstructed at 380~GeV CLIC after selection based on the BDT response. The distribution is normalised to $500\,\invfb$ and BR(\tcg) $=10^{-3}$ for the signal events. The hatched histogram indicates the SM background contribution. - 00107 Response distributions of the BDT classifiers used for the final selection of \tcx events at $\roots=380\,\GeV$, for an assumed mass of the invisible decay product of 50\,GeV (low mass selection; left) and 125\,GeV (high mass selection; right). The total background (red histogram) is normalised to $500\,\invfb$ while the signal (events with a FCNC top quark decay; blue histogram) is normalised to BR(\tcx) $=10^{-3}$. The hatched histogram indicates the contribution from four fermion and quark-pair backgrounds. - 00101 Distribution of the BDT classifier response for events with FCNC top-quark decay \tcg (signal, blue histogram) and SM events (background, red histogram), for FCNC selection at 380~GeV CLIC. The background sample is normalised to 500\,fb$^{-1}$ while the signal (events with FCNC decay) is normalised to BR(\tcg) $=10^{-3}$. The hatched histogram indicates the contribution from the six-fermion background. - 00088 Response distribution of the BDT classifier used for the final \tch event selection at $\roots=380\,\gev$, for hadronic (left) and semi-leptonic (right) event samples. The total background (red histogram) is normalised to $500\,\invfb$ while the signal (events with a FCNC top quark decay; blue histogram) is normalised to BR(\tch)$\times$BR(\hbb) $=10^{-3}$. The hatched histogram indicates the contribution from four fermion and quark-pair backgrounds. - 00061 The N-subjettiness ratio $\tau_2/\tau_1$ for the leptonically decaying large-$R$ jet (left). Reconstructed centre-of-mass energy $\rootsprimereco$ from kinematic fitting vs the generated collision energy, $\rootsprime$, including the effects of the luminosity spectrum and ISR (right). To illustrate the correlation down to lower $\rootsprime$, the $\rootsprime$ distribution is reweighted so that each column contains the same number of entries, leading to a flat distribution in $\rootsprime$. - 00081 Top-quark polar angle distributions for operation at $\roots=380\,\GeV$ after the application of a quality cut based on the kinematic variable $D^2$. A cut of $D^2&lt;15\,(1)$ was applied for the left (right) figure. The solid lines show the reconstructed distributions including the effects of detector modelling, event reconstruction and candidate selection, while the dashed lines show the \whizard parton-level distributions, for the two beam polarisation configurations considered. Note that efficiency corrections have been applied, corresponding to the parton-level expectation for $D^{2}&lt;15$. - 00070 Response distributions of the BDT classifiers used for the final selection of \tcx events at $\roots=380\,\GeV$, for an assumed mass of the invisible decay product of 50\,GeV (low mass selection; left) and 125\,GeV (high mass selection; right). The total background (red histogram) is normalised to $500\,\invfb$ while the signal (events with a FCNC top quark decay; blue histogram) is normalised to BR(\tcx) $=10^{-3}$. The hatched histogram indicates the contribution from four fermion and quark-pair backgrounds. - 00077 Response distributions for BDT classifiers trained to recognise hadronic top-quark pair events (left) and semi-leptonic top-quark pair events (right). Distributions for different samples of $\ttbar$ events and other SM backgrounds are compared for $500\,\invfb$ at 380\,GeV CLIC. - 00058 The luminosity spectra for CLIC operating at $\roots=380\,\GeV$ and $3\,\TeV$, where $x_\textrm{s}$ denotes the ratio of the effective centre-of-mass energy after beamstrahlung, $\rootsprime$, to the nominal centre-of-mass energy $\roots$~\cite{CLIC_PhysDet_CDR, CLIC_beam_web}. - 00083 An illustration of a highly boosted $\ttbar\to\PQq\PQq\PQq\PQq\PGm\PGnGm$ event in \clicild with an effective collision energy $\rootsprime=3\,\mathrm{TeV}$. The event includes overlay of $\gghadrons$ background as described in \autoref{ssec:detsim}. An isolated lepton is clearly seen along with two large boosted jets. - 00076 Response distributions for BDT classifiers trained to recognise hadronic top-quark pair events (left) and semi-leptonic top-quark pair events (right). Distributions for different samples of $\ttbar$ events and other SM backgrounds are compared for $500\,\invfb$ at 380\,GeV CLIC. - 00064 Normalised distribution of the number of events as a function of reconstructed jet mass and energy for fully-hadronic $\ttbar$ events at $\roots=3\,\tev$. The particles are reconstructed into two exclusive jets using the VLC algorithm using a jet clustering radius of 0.4 (VLC4, left), and a radius of 1.0 (VLC10, right). The $\beta$ and $\gamma$ parameters are both set to 1.0. - 00110 Two scenarios of the CLIC luminosity spectrum for a threshold scan (left); one based on the nominal accelerator parameters of the 380\,GeV initial stage of CLIC (optimised for instantaneous luminosity), and one optimised for reduced beamstrahlung (``LowCharge''). The impact of the luminosity spectra on the top-quark pair production cross section, where the blue and red curves show the visible cross section for the nominal and the LowCharge luminosity spectra, respectively (right). - 00096 Response distributions for BDT classifiers trained to recognise hadronic top-quark pair events (left) and semi-leptonic top-quark pair events (right). Distributions for different samples of $\ttbar$ events and other SM backgrounds are compared for $500\,\invfb$ at 380\,GeV CLIC. - 00063 Response distributions for BDT classifiers trained to recognise hadronic top-quark pair events (left) and semi-leptonic top-quark pair events (right). Distributions for different samples of $\ttbar$ events and other SM backgrounds are compared for $500\,\invfb$ at 380\,GeV CLIC. - 00092 Two scenarios of the CLIC luminosity spectrum for a threshold scan (left); one based on the nominal accelerator parameters of the 380\,GeV initial stage of CLIC (optimised for instantaneous luminosity), and one optimised for reduced beamstrahlung (``LowCharge''). The impact of the luminosity spectra on the top-quark pair production cross section, where the blue and red curves show the visible cross section for the nominal and the LowCharge luminosity spectra, respectively (right). - 00060 Longitudinal cross section of the top right quadrant of the \clicild (left) and \clicsid (right) detector concepts \cite{CLIC_PhysDet_CDR}. - 00071 Longitudinal cross section of the top right quadrant of the \clicild (left) and \clicsid (right) detector concepts \cite{CLIC_PhysDet_CDR}. - 00062 Cross section of top-quark pair production in the threshold region, showing the NNNLO QCD theory cross section obtained with \code{QQbar\_threshold} \cite{Beneke:2016kkb} and the associated renormalisation scale uncertainties. - 00085 Distribution of the reconstructed invariant mass of the invisible decay product for the FCNC decay \tcx, reconstructed at 380~GeV CLIC after preselection cuts. The background contributions coming from 6-fermion (green histogram), four-fermion (red) and quark pair (magenta) production processes are normalised to 500~fb$^{-1}$ while the signal samples, for the assumed mass of the invisible scalar of 50, 100 and 150 GeV (blue histograms) are normalised to BR(\tcx) $=10^{-3}$. - 00082 Top-quark polar angle distributions for operation at $\roots=380\,\GeV$ after the application of a quality cut based on the kinematic variable $D^2$. A cut of $D^2&lt;15\,(1)$ was applied for the left (right) figure. The solid lines show the reconstructed distributions including the effects of detector modelling, event reconstruction and candidate selection, while the dashed lines show the \whizard parton-level distributions, for the two beam polarisation configurations considered. Note that efficiency corrections have been applied, corresponding to the parton-level expectation for $D^{2}&lt;15$. - 00066 Top tagger efficiency for fully-hadronic $\ttbar$ events (blue), four-jet events (red), and dijet events (orange) as function of jet energy (top) and jet polar angle $\theta$ (bottom). The solid lines show the effect of applying the de-clustering procedure outlined in the text, while the dashed lines show the efficiency including also the cuts on the reconstructed invariant mass of the top-quark and $\PW$ candidates. - 00073 $1\sigma$ statistical uncertainty contours of two-parameter fits to the top threshold region, combining the top-quark mass and width (left) and the top-quark mass and the top Yukawa coupling (right). The contours are shown for both the nominal luminosity spectrum and the ``LowCharge'' option, in both cases assuming an integrated luminosity of 100\,\fbinv. - 00105 Top-quark polar angle distributions for operation at $\roots=380\,\GeV$ after the application of a quality cut based on the kinematic variable $D^2$. A cut of $D^2<15\,(1)$ was applied for the left (right) figure. The solid lines show the reconstructed distributions including the effects of detector modelling, event reconstruction and candidate selection, while the dashed lines show the \whizard parton-level distributions, for the two beam polarisation configurations considered. Note that efficiency corrections have been applied, corresponding to the parton-level expectation for $D^{2}<15$. - 00090 The top-quark polar angle distributions for the analysis of radiative semi-leptonic $\ttbar$ events at $\roots=1.4\,\TeV$, for $P(\Pem)=\text{-}80\%$ (left column) and $P(\Pem)=\text{+}80\%$ (right column), and an integrated luminosity of $750\,\fbinv$. Distributions are shown for the three signal regions in $\rootsprime$. The dashed black curve shows the reconstructed total MC distribution, while the grey area indicates the level of background only. The blue data points and dotted line represent one pseudo-experiment after subtraction of background and correction for finite selection efficiencies, and the corresponding fit, respectively. The red solid line represents the simulated parton-level distribution. - 00075 Prediction of the observable (left) for $\overline{m}_{\PQt}(\overline{m}_{\PQt}) = 166,\,167$\,GeV (where $\overline{m}_{\PQt}(\overline{m}_{\PQt})$ denotes the top-quark mass in the $\overline{\textrm{MS}}$ scheme, evaluated at the top-quark mass in the $\overline{\textrm{MS}}$ scheme) with the matched NNLL threshold and NNLO continuum calculation for $\roots = 380$\,GeV (solid line) and folded with the CLIC luminosity spectrum (dashed line). Pseudodata (right) generated with the matched NNLL threshold and NNLO continuum calculation for $\roots = 380$\,GeV and folded with the CLIC luminosity spectrum. The markers give a statistical uncertainty estimated from the $\pm \,1\,\sigma$ envelope of $1500$ datasets of $500\,{\rm fb}^{-1}$. The binning corresponds to the expected energy resolution of the electromagnetic calorimeter. The shaded area gives the envelope of the scale variation presented in \autoref{tab:table1}. - 00084 The N-subjettiness ratio $\tau_2/\tau_1$ for the leptonically decaying large-$R$ jet (left). Reconstructed centre-of-mass energy $\rootsprimereco$ from kinematic fitting vs the generated collision energy, $\rootsprime$, including the effects of the luminosity spectrum and ISR (right). To illustrate the correlation down to lower $\rootsprime$, the $\rootsprime$ distribution is reweighted so that each column contains the same number of entries, leading to a flat distribution in $\rootsprime$. - 00093 Top-quark polar angle distributions from the analysis of boosted semi-leptonic $\ttbar$ events, at a nominal collision energy of 1.4\,\tev for $P(\Pem)=\text{-}80\%$ (left) and $P(\Pem)=\text{+}80\%$ (right), and an integrated luminosity of $750\,\fbinv$. The dashed black curve shows the reconstructed total MC distribution, while the grey area indicates the level of background only. The blue data points and dotted line represent one pseudo-experiment after subtraction of background and correction for finite selection efficiencies, and the corresponding fit, respectively. The red solid line represents the simulated parton-level distribution. - 00069 Prediction of the observable (left) for $\overline{m}_{\PQt}(\overline{m}_{\PQt}) = 166,\,167$\,GeV (where $\overline{m}_{\PQt}(\overline{m}_{\PQt})$ denotes the top-quark mass in the $\overline{\textrm{MS}}$ scheme, evaluated at the top-quark mass in the $\overline{\textrm{MS}}$ scheme) with the matched NNLL threshold and NNLO continuum calculation for $\roots = 380$\,GeV (solid line) and folded with the CLIC luminosity spectrum (dashed line). Pseudodata (right) generated with the matched NNLL threshold and NNLO continuum calculation for $\roots = 380$\,GeV and folded with the CLIC luminosity spectrum. The markers give a statistical uncertainty estimated from the $\pm \,1\,\sigma$ envelope of $1500$ datasets of $500\,{\rm fb}^{-1}$. The binning corresponds to the expected energy resolution of the electromagnetic calorimeter. The shaded area gives the envelope of the scale variation presented in \autoref{tab:table1}. - 00094 Top-quark polar angle distributions from the analysis of boosted semi-leptonic $\ttbar$ events, at a nominal collision energy of 3\,\tev for $P(\Pem)=\text{-}80\%$ (left) and $P(\Pem)=\text{+}80\%$ (right), and an integrated luminosity of $1.5\,\abinv$. See further details in \autoref{fig:ttbar:boosted:costheta}. - 00108 Top-quark polar angle distributions from the analysis of boosted semi-leptonic $\ttbar$ events, at a nominal collision energy of 1.4\,\tev for $P(\Pem)=\text{-}80\%$ (left) and $P(\Pem)=\text{+}80\%$ (right), and an integrated luminosity of $750\,\fbinv$. The dashed black curve shows the reconstructed total MC distribution, while the grey area indicates the level of background only. The blue data points and dotted line represent one pseudo-experiment after subtraction of background and correction for finite selection efficiencies, and the corresponding fit, respectively. The red solid line represents the simulated parton-level distribution. - 00059 The top-quark polar angle distributions for the analysis of radiative semi-leptonic $\ttbar$ events at $\roots=1.4\,\TeV$, for $P(\Pem)=\text{-}80\%$ (left column) and $P(\Pem)=\text{+}80\%$ (right column), and an integrated luminosity of $750\,\fbinv$. Distributions are shown for the three signal regions in $\rootsprime$. The dashed black curve shows the reconstructed total MC distribution, while the grey area indicates the level of background only. The blue data points and dotted line represent one pseudo-experiment after subtraction of background and correction for finite selection efficiencies, and the corresponding fit, respectively. The red solid line represents the simulated parton-level distribution. - 00095 Top-quark polar angle distributions from the analysis of boosted semi-leptonic $\ttbar$ events, at a nominal collision energy of 3\,\tev for $P(\Pem)=\text{-}80\%$ (left) and $P(\Pem)=\text{+}80\%$ (right), and an integrated luminosity of $1.5\,\abinv$. See further details in \autoref{fig:ttbar:boosted:costheta}. - 00111 Top-quark polar angle distributions from the analysis of boosted semi-leptonic $\ttbar$ events, at a nominal collision energy of 1.4\,\tev for $P(\Pem)=\text{-}80\%$ (left) and $P(\Pem)=\text{+}80\%$ (right), and an integrated luminosity of $750\,\fbinv$. The dashed black curve shows the reconstructed total MC distribution, while the grey area indicates the level of background only. The blue data points and dotted line represent one pseudo-experiment after subtraction of background and correction for finite selection efficiencies, and the corresponding fit, respectively. The red solid line represents the simulated parton-level distribution. - 00067 Top tagger efficiency for fully-hadronic $\ttbar$ events (blue), four-jet events (red), and dijet events (orange) as function of jet energy (top) and jet polar angle $\theta$ (bottom). The solid lines show the effect of applying the de-clustering procedure outlined in the text, while the dashed lines show the efficiency including also the cuts on the reconstructed invariant mass of the top-quark and $\PW$ candidates. - 00097 Top-quark polar angle distributions from the analysis of boosted semi-leptonic $\ttbar$ events, at a nominal collision energy of 3\,\tev for $P(\Pem)=\text{-}80\%$ (left) and $P(\Pem)=\text{+}80\%$ (right), and an integrated luminosity of $1.5\,\abinv$. See further details in \autoref{fig:ttbar:boosted:costheta}. - 00087 The top-quark polar angle distributions for the analysis of radiative semi-leptonic $\ttbar$ events at $\roots=1.4\,\TeV$, for $P(\Pem)=\text{-}80\%$ (left column) and $P(\Pem)=\text{+}80\%$ (right column), and an integrated luminosity of $750\,\fbinv$. Distributions are shown for the three signal regions in $\rootsprime$. The dashed black curve shows the reconstructed total MC distribution, while the grey area indicates the level of background only. The blue data points and dotted line represent one pseudo-experiment after subtraction of background and correction for finite selection efficiencies, and the corresponding fit, respectively. The red solid line represents the simulated parton-level distribution. - 00086 The top-quark polar angle distributions for the analysis of radiative semi-leptonic $\ttbar$ events at $\roots=1.4\,\TeV$, for $P(\Pem)=\text{-}80\%$ (left column) and $P(\Pem)=\text{+}80\%$ (right column), and an integrated luminosity of $750\,\fbinv$. Distributions are shown for the three signal regions in $\rootsprime$. The dashed black curve shows the reconstructed total MC distribution, while the grey area indicates the level of background only. The blue data points and dotted line represent one pseudo-experiment after subtraction of background and correction for finite selection efficiencies, and the corresponding fit, respectively. The red solid line represents the simulated parton-level distribution. - 00091 The top-quark polar angle distributions for the analysis of radiative semi-leptonic $\ttbar$ events at $\roots=1.4\,\TeV$, for $P(\Pem)=\text{-}80\%$ (left column) and $P(\Pem)=\text{+}80\%$ (right column), and an integrated luminosity of $750\,\fbinv$. Distributions are shown for the three signal regions in $\rootsprime$. The dashed black curve shows the reconstructed total MC distribution, while the grey area indicates the level of background only. The blue data points and dotted line represent one pseudo-experiment after subtraction of background and correction for finite selection efficiencies, and the corresponding fit, respectively. The red solid line represents the simulated parton-level distribution. - 00074 Prediction of the observable (left) for $\overline{m}_{\PQt}(\overline{m}_{\PQt}) = 166,\,167$\,GeV (where $\overline{m}_{\PQt}(\overline{m}_{\PQt})$ denotes the top-quark mass in the $\overline{\textrm{MS}}$ scheme, evaluated at the top-quark mass in the $\overline{\textrm{MS}}$ scheme) with the matched NNLL threshold and NNLO continuum calculation for $\roots = 380$\,GeV (solid line) and folded with the CLIC luminosity spectrum (dashed line). Pseudodata (right) generated with the matched NNLL threshold and NNLO continuum calculation for $\roots = 380$\,GeV and folded with the CLIC luminosity spectrum. The markers give a statistical uncertainty estimated from the $\pm \,1\,\sigma$ envelope of $1500$ datasets of $500\,{\rm fb}^{-1}$. The binning corresponds to the expected energy resolution of the electromagnetic calorimeter. The shaded area gives the envelope of the scale variation presented in \autoref{tab:table1}. - 00113 Same as \autoref{fig:limits_no_high}, but including operation at $3\,\tev$ CLIC with $3\,\invab$ integrated luminosity. - 00100 Same as \autoref{fig:limits_no_high}, but including operation at $3\,\tev$ CLIC with $3\,\invab$ integrated luminosity. - 00072 Global EFT analysis results for top-quark pair production at the $380\,\gev$ and $1.4\,\tev$ CLIC, using respectively $500\,\invfb$ and $1.5\,\invab$ of integrated luminosity equally shared between $P(\Pem)=(\pm80\%)$ beam polarisation configurations. $1\sigma$ sensitivities to the seven Wilson coefficients for the statistically optimal observables are shown in blue bars and for the combination of $\afb$ and $\csttbar$ in orange bars. The corresponding single-operator sensitivities are shown as ticks of the same colour for the two set of operators. The correlation matrix among the Wilson coefficients for the fits using the statistically optimal observables (left). - 00065 ``Optimistic'' (light color) and ``pessimistic'' (dark color) $5\sigma$ discovery regions for the partial compositeness (left) and the total $t_R$ compositeness (right) scenarios. The orange contours are derived from the $\ttbar$ global fit in \autoref{ssec:topphilicinterp}, while the green contour is derived from the top Yukawa analysis in \autoref{deltaytop}. Only the optimistic case is shown for the top Yukawa analysis. - 00098 Top-quark pair invariant mass distributions for CLIC at $\roots=3\,\tev$ with $3\,\invab$. $\Pep\Pem\rightarrow\ttbar\PAGn\PGn$ (VBF) after a cut on the total invariant mass, illustrating the effect of including one example EFT operator, $Q_{\varphi{\PQt}}$, that grows with energy (left). VBF signal distribution and the $\epem\rightarrow\ttbar$ SM background process before and after a cut on the total missing transverse energy, $E_{\mathrm{T}}^{\mathrm{miss}}>20\,\gev$ (right). Note that $\epem\rightarrow\ttbar$ includes both initial state radiation (ISR) and beamstrahlung (BS) effects. - 00109 Summary of the global EFT analysis results using statistically optimal observables for the three CLIC energy stages. The colour bars indicate the $1\sigma$ constraints on each of the seven Wilson coefficients. The blue bars illustrate the results for the full CLIC programme of consecutive operation at $380\,\gev$, $1.4\,\tev$, and $3\,\tev$, using respectively $500\,\invfb$, $1.5\,\invab$, and $3\,\invab$, equally shared between $P(\Pem)=(\pm80\%)$ beam polarisation configurations. Similarly, the green bars give the results of operation at $380\,\gev$ and $1.4\,\tev$, excluding the $3\,\tev$ stage. The corresponding individual operator sensitivities are shown as ticks. Note that a global fit is not possible for operation at $380\,\gev$ alone, for which the individual operator constraints are shown in red. - 00115 ``Optimistic'' (light color) and ``pessimistic'' (dark color) $5\sigma$ discovery regions for the partial compositeness (left) and the total $t_R$ compositeness (right) scenarios. The orange contours are derived from the $\ttbar$ global fit in \autoref{ssec:topphilicinterp}, while the green contour is derived from the top Yukawa analysis in \autoref{deltaytop}. Only the optimistic case is shown for the top Yukawa analysis. - 00112 Normalised distribution of the number of events as a function of reconstructed jet mass and energy for fully-hadronic $\ttbar$ events at $\roots=3\,\tev$. The particles are reconstructed into two exclusive jets using the VLC algorithm using a jet clustering radius of 0.4 (VLC4, left), and a radius of 1.0 (VLC10, right). The $\beta$ and $\gamma$ parameters are both set to 1.0. - 00114 ``Optimistic'' (light color) and ``pessimistic'' (dark color) $5\sigma$ discovery regions for the partial compositeness (left) and the total $t_R$ compositeness (right) scenarios. The orange contours are derived from the $\ttbar$ global fit in \autoref{ssec:topphilicinterp}, while the green contour is derived from the top Yukawa analysis in \autoref{deltaytop}. Only the optimistic case is shown for the top Yukawa analysis. - 00079 Distributions of the top-quark mass reconstructed from the hadronic top-quark decays for hadronic (left) and semi-leptonic (right) events, for $500\,\invfb$ at 380\,GeV CLIC. - Full text - Fulltext

Αναλυτική εγγραφή - Παρόμοιες εγγραφές
2018-06-29
15:10
Technologies for Future Vertex and Tracking Detectors at CLIC / Spannagel, Simon (CERN)
CLIC is a proposed linear e$^{+}$e$^{-}$ collider with center-of-mass energies of up to 3 TeV. Its main objectives are precise top quark and Higgs boson measurements, as well as searches for Beyond Standard Model physics. [...]
CLICdp-Conf-2018-003.- Geneva : CERN, 2018 - 5. Fulltext: PDF;

Αναλυτική εγγραφή - Παρόμοιες εγγραφές
2018-06-29
12:57
News on the CLIC Physics Potential / Watson, Nigel (University of Birmingham)
Recent studies exploring the physics potential of the CLIC project are presented, with par- ticular emphasis on t quark and Higgs measurements..
CLICdp-Conf-2018-002.- Geneva : CERN, 2018 - 4. Fulltext: PDF;
In : 53rd Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Italy, 17 - 24 Mar 2018

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2018-06-20
17:47
Hidden Valley searches at CLIC / Kucharczyk, Marcin (Polish Academy of Sciences (PL)) ; Wojton, Tomasz (Polish Academy of Sciences (PL))
Several beyond the Standard Model theoretical models predict the decay of Higgs bosons decaying into heavy long-lived particles. The sensitivity to observe such long-lived particles has been determined using a data sample of e$^+$e$^-$ collisions at $\sqrt{s}=$3 TeV, simulated with the CLIC_ILD detector model and corresponding to an integrated luminosity of 3 ab$^{-1}$. [...]
CLICdp-Note-2018-001.- Geneva : CERN, 2018 - 31. Fulltext: PDF;

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2018-04-27
22:22
Allpix$^2$: A Modular Simulation Framework for Silicon Detectors / Spannagel, Simon (CERN) ; Wolters, Koen (Eindhoven Technical University (NL)) ; Hynds, Daniel (University of Glasgow (GB)) ; Alipour Tehrani, Niloufar (CERN) ; Benoit, Mathieu (Universite de Geneve (CH)) ; Dannheim, Dominik (CERN) ; Gauvin, Neal (Universite de Geneve (CH)) ; Nurnberg, Andreas Matthias (KIT - Karlsruhe Institute of Technology (DE)) ; Schutze, Paul Jean (Deutsches Elektronen-Synchrotron (DE)) ; Vicente Barreto Pinto, Mateus (Universite de Geneve (CH))
Allpix$^2$ (read: Allpix Squared) is a generic, open-source software framework for the simulation of silicon pixel detectors. Its goal is to ease the implementation of detailed simulations for both single detectors and more complex setups such as beam telescopes from incident radiation to the digitised detector response. [...]
CLICdp-Pub-2018-002; CLICDP-PUB-2018-002; arXiv:1806.05813.- Geneva : CERN, 2018-09-01 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res. A 901 (2018) 164-172 Fulltext: PDF; Version accepted for publication: PDF;

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2018-04-06
21:14
Методe мерења односа гранања Хигсовог бозона у процесима $H \rightarrow \mu^{+}\mu^{-}$ и $H \rightarrow Z Z^{\star}$ на 1.4 TeV на будућем линеарном сударачу CLIC / Milutinovic-Dumbelovic, Gordana
This thesis has been done at the CLIC (Compact Linear Collider) project, to be hosted by the European Organisation for Nuclear Research in Geneva (CERN), Switzerland [...]
CERN-THESIS-2017-349 - 166 p.

Fulltext
Αναλυτική εγγραφή - Παρόμοιες εγγραφές
2018-03-23
09:22
Test-beam results of a SOI pixel detector prototype / Bugiel, Roma (AGH University of Science and Technology (PL)) ; Bugiel, Szymon (AGH University of Science and Technology (PL)) ; Dannheim, Dominik (CERN) ; Fiergolski, Adrian (CERN) ; Hynds, Daniel (University of Glasgow (GB)) ; Idzik, Marek (AGH University of Science and Technology (PL)) ; Kapusta, P (IFJ, Poland) ; Kucewicz, Wojciech (Polish Academy of Sciences (PL)) ; Munker, Ruth Magdalena (University of Bonn (DE)) ; Nurnberg, Andreas Matthias (KIT - Karlsruhe Institute of Technology (DE))
This paper presents the test-beam results of a monolithic pixel-detector prototype fabricated in 200 nm Silicon-On-Insulator (SOI) CMOS technology. The SOI detector was tested at the CERN SPS H6 beam line. [...]
CLICdp-Pub-2018-001.- Geneva : CERN, 2018 - 16. Fulltext: PDF;

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2018-02-08
18:29
Investigation of Hadronic Higgs Decays at CLIC at 350 GeV & Scintillator Studies for a Highly Granular Calorimeter / Szalay, Marco
The energy frontier of accelerator-based physics has been dominated, for the best part of the last ten years, by the Large Hadron Collider (LHC) [...]
CERN-THESIS-2017-305 - 189 p.

Fulltext
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2018-01-16
11:31
Limits on top FCNC decay t$\rightarrow$cH and t$\rightarrow$c$\gamma$ from CLIC at 380 GeV / Zarnecki, Aleksander (University of Warsaw (PL)) ; Van Der Kolk, Naomi (Nikhef National institute for subatomic physics (NL)) /CLICdp Collaboration
FCNC top decays are very strongly suppressed in the Standard Model and the observation of any such decay would be a direct signature of physics beyond SM. Many "new physics" scenarios predict contributions to FCNC processes and the largest enhancement in many models is for t$\rightarrow$cH decay. [...]
CLICdp-Conf-2018-001; arXiv:1801.04585.- Geneva : CERN, 2018 - 9 p. Fulltext: PDF; Preprint: PDF;
In : 2017 International Workshop on Future Linear Colliders, Strasbourg, France, 23 - 27 Oct 2017

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CLIC Detector and Physics Study Drafts (105) [περιορισμένο]