20180720 18:21 
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20180720 04:10 
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20180720 04:10 
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20180720 04:10 
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20180720 04:10 

Heavyflavour hadron decay leptons in PbPb and XeXe collisions at the LHC with ALICE
/ Dubla, Andrea
Heavy quarks, i.e. [...]
arXiv:1807.05382.

Full text  00009 Left: Comparison of the $R_{\rm AA}$ of electrons from beautyhadron decays (red markers) with the one from charm plus beautyhadron decays (black markers) in PbPb collisions at $\sqrt{s}$ = 5.02 TeV. Right: $R_{\rm AA}$ of electrons from beauty hadron decay in comparison with models implementing massdependent energy loss \cite{EPOS, Djordjevic, PHSD} in PbPb collisions at $\sqrt{s}$ = 5.02 TeV.  00010 Left: $R_{\rm AA}$ of electrons from heavyflavour hadron decays as a function of $p_{\rm T}$ in central (010\%) PbPb (black and grey markers) and in pPb (blue markers) collisions \cite{rpPbelectron} at $\sqrt{s}$ = 5.02 TeV. Right: $R_{\rm AA}$ of electrons from heavyflavour hadron decays at $\sqrt{s}$ = 2.76 TeV in comparison with model calculations with and without the inclusion of the EPS09 shadowing parameterisations \cite{POWLANG, EPOS, TAMU}.  00007 Nuclear modification factors of electrons (black markers) and muons (red markers) from heavyflavour hadron decay in central (left panel) and semicentral (right panel) XeXe collisions at $\sqrt{s_{\rm NN}}$ = 5.44 TeV.  00006 Left: Comparison of the $R_{\rm AA}$ of electrons from beautyhadron decays (red markers) with the one from charm plus beautyhadron decays (black markers) in PbPb collisions at $\sqrt{s}$ = 5.02 TeV. Right: $R_{\rm AA}$ of electrons from beauty hadron decay in comparison with models implementing massdependent energy loss \cite{EPOS, Djordjevic, PHSD} in PbPb collisions at $\sqrt{s}$ = 5.02 TeV.  00008 $p_\mathrm{T}$differential production cross section for electrons from heavyflavour hadron decay in pp collisions at several collision energies (from left to right panel: $\sqrt{s}$ = 2.76, 5.02, 7 and 13 TeV) in comparison with FONLL calculations \cite{FONLL}.  00011 Left: $R_{\rm AA}$ of electrons from heavyflavour hadron decays as a function of $p_{\rm T}$ in central (010\%) PbPb (black and grey markers) and in pPb (blue markers) collisions \cite{rpPbelectron} at $\sqrt{s}$ = 5.02 TeV. Right: $R_{\rm AA}$ of electrons from heavyflavour hadron decays at $\sqrt{s}$ = 2.76 TeV in comparison with model calculations with and without the inclusion of the EPS09 shadowing parameterisations \cite{POWLANG, EPOS, TAMU}.  Fulltext

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20180720 04:10 
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20180720 04:10 
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20180719 16:45 

A strategy for a general search for new phenomena using dataderived signal regions and its application within the ATLAS experiment
/ ATLAS Collaboration
This paper describes a strategy for a general search used by the ATLAS Collaboration to find potential indications of new physics. [...]
arXiv:1807.07447 ; CERNEP2018070.

2018.  62 p, 62 p.
Full text  00046 Flow diagram for the trigger and offline event selection strategy. The offline requirements are shown on the left of the dashed line and the trigger requirements are shown on the right of the dashed line.  00033 The number of events in data, and for the different SM background predictions considered, for classes with large \met{}, one muon, one electron and ($b$)jets (no photons). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction.  00028 The number of events in data, and for the different SM background predictions considered, for classes with one muon, one electron and ($b$)jets (no photons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction.  00048 The number of events in data, and for the different SM background predictions considered, for classes with large \met{} and ($b$)jets (no leptons or photons). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction.  00043 The number of events in data, and for the different SM background predictions considered, for classes with at least two leptons, at least one photon and ($b$)jets (no \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction.  00040 The number of events in data, and for the different SM background predictions considered, for classes with one muon and ($b$)jets (no electrons, photons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction.  00025 :  00037 The number of events in data, and for the different SM background predictions considered, for classes with one electron and ($b$)jets (no muons, photons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction.  00035 The number of events in data, and for the different SM background predictions considered, for classes with at least one photon and ($b$)jets (no leptons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. In event classes with four or more data events, the $\gamma+\text{jets}$ and $\gamma\gamma+\text{jets}$ MC samples are scaled to data in the singlephoton and diphoton event classes respectively. The hatched bands indicate the total uncertainty of the SM prediction.  00036 The number of events in data, and for the different SM background predictions considered, for classes with one lepton, at least one photon and ($b$)jets (no \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction.  00026 : The fraction of pseudoexperiments which have at least one, two and three \pchannelvalues below a given $p_{\text{min}}$, given for both the pseudoexperiments generated from the nominal SM expectation and tested against the nominal expectation (dashed) and for those tested against the modified expectation (`SM, $t\bar{t}\gamma$ removed') in which the $t\bar{t}\gamma$ process is removed (solid). The \minv{} scan is shown in (a) and the \meff{} scan in (b). The scan results of the data tested against the modified background prediction are indicated with solid arrows. For reference the scan results under the SM hypothesis are plotted as dashed arrows. The largest deviation after removing the $t\bar{t}\gamma$ process from the background expectation is found in the \meff{} distribution of the $1e1\gamma1b2j$ event class. The distributions of the data and the expectation with both $t\bar{t}\gamma$ included and $t\bar{t}\gamma$ removed are shown in (c) and (d) respectively. : Caption not extracted  00044 The number of events in data, and for the different SM background predictions considered, for classes with two sameflavour leptons and ($b$)jets (no photons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction.  00027 : The fraction of pseudoexperiments which have at least one, two and three \pchannelvalues below a given $p_{\min}$, given for both the pseudoexperiments generated from the nominal SM expectation and tested against the nominal expectation (dashed) and for those tested against the modified expectation (`SM, $WZ$ removed') in which the $WZ$ diboson process is removed (solid). The \minv{} scan is shown in (a) and the \meff{} scan in (b). The scan results of the data tested against the modified background prediction are indicated with solid arrows. For reference the scan results under the SM hypothesis are plotted as dashed arrows. The largest deviation after removing the $WZ$ process from the background expectation is found in the \meff{} distribution of the $3\mu$ event class. The distributions of the data and the expectation with both $WZ$ included and $WZ$ removed are shown in (c) and (d) respectively. : Caption not extracted  00039 The number of events in data, and for the different SM background predictions considered, for classes with three or four leptons and ($b$)jets (no photons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction.  00031 The number of events in data, and for the different SM background predictions considered, for classes with large \met{}, at least one photon, leptons and ($b$)jets. The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction.  00032 The number of events in data, and for the different SM background predictions considered, for classes with ($b$)jets (no \met{}, leptons or photons). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. In event classes with four or more data events, the multijet MC sample is scaled to data. The hatched bands indicate the total uncertainty of the SM prediction.  00034 : Caption not extracted  00041 The number of events in data, and for the different SM background predictions considered, for classes with large \met{}, one lepton and ($b$)jets (no photons). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. This figure shows 60 out of 704 event classes, the remaining event classes can be found in \Figrange{\ref{fig:global2}}{\ref{fig:global14}} of \App{\ref{appendixA3}}.  00038 The number of events in data, and for the different SM background predictions considered, for classes with large \met{}, at least one pair of same flavour leptons and ($b$)jets (no photons). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction.  00029 : Caption not extracted  00030 : : Example distributions showing the region of interest (ROI), i.e.\ the region with the smallest \pvaluevalue, between the vertical dashed lines. (a) $\met{} 1\gamma 3j$ channel, which has the largest deviation in the \minv{} scan. (b) $1\mu 1e 4b 2j$ channel, which has the largest deviation in the \meff{} scan. (c) An upward fluctuation in the \minv{} distribution of the $1e 1\gamma 2b 2j$ channel. (d) A downward fluctuation in the \meff{} distribution of the $6j$ channel. (e) A downward fluctuation in the \minv{} distribution of the $\met{} 2\mu 1j$ channel. (f) An upward fluctuation in the \meff{} distribution of the $\met 3j$ channel. The hatched band includes all systematic and statistical uncertainties from MC simulations. In the ratio plots the inner solid uncertainty band shows the statistical uncertainty from MC simulations, the middle solid band includes the experimental systematic uncertainty, and the hatched band includes the theoretical systematic uncertainty.  00049 : Caption not extracted  00047 :  00045 : Caption not extracted  00042 :  Fulltext  Fulltext

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20180718 20:42 

Search for dark matter particles produced in association with a top quark pair at $\sqrt{s} = $ 13 TeV
/ CMS Collaboration
A search is performed for dark matter particles produced in association with a top quark pair in protonproton collisions at $\sqrt{s} = $ 13 TeV. [...]
arXiv:1807.06522 ; CMSEXO16049 ; CERNEP2018183 ; CMSEXO16049003.

2018.
Fulltext  Fulltext  00011 The 95\% observed and median expected \CL upper limits on the coupling strength of the mediator to the standard model quarks under the assumption that $\Pg_{\chi}=1$. A dark matter particle with a mass of 1\GeV is assumed. The green and yellow bands indicate respectively the 68\% and 95\% probability intervals around the expected limit. The interpretations for a scalar (\cmsLeft) and a pseudoscalar (\cmsRight) mediator are shown.  00012 The 95\% observed and median expected \CL upper limits on the coupling strength of the mediator to the standard model quarks under the assumption that $\Pg_{\chi}=1$. A dark matter particle with a mass of 1\GeV is assumed. The green and yellow bands indicate respectively the 68\% and 95\% probability intervals around the expected limit. The interpretations for a scalar (\cmsLeft) and a pseudoscalar (\cmsRight) mediator are shown.  00010 The 95\% observed and median expected \CL upper limits on the coupling strength of the mediator to the standard model quarks under the assumption that $\Pg_{\chi}=1$. A dark matter particle with a mass of 1\GeV is assumed. The green and yellow bands indicate respectively the 68\% and 95\% probability intervals around the expected limit. The interpretations for a scalar (\cmsLeft) and a pseudoscalar (\cmsRight) mediator are shown.  00013 The 95\% observed and median expected \CL upper limits on the coupling strength of the mediator to the standard model quarks under the assumption that $\Pg_{\chi}=1$. A dark matter particle with a mass of 1\GeV is assumed. The green and yellow bands indicate respectively the 68\% and 95\% probability intervals around the expected limit. The interpretations for a scalar (\cmsLeft) and a pseudoscalar (\cmsRight) mediator are shown.  00008 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the allhadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the differentflavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background.  00010 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the allhadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the differentflavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background.  00007 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the allhadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the differentflavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background.  00011 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the allhadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the differentflavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background.  00009 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the allhadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the differentflavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background.  00009 Selected $\ptmiss$ distributions in SRs: 2RTT SR for the allhadronic (\cmsUpperLeft), the $\ell+$jets (\cmsUpperRight), and the differentflavor, $\mtll>110\GeV$ SR in the dileptonic channel (\cmsLowerRight). The solid red line shows the expectation for a signal with $m_\Pa = 100\GeV$ and $m_{\chi} = 1\GeV$. The last bin contains the overflow events. The lower panel shows the ratio of the observed to the fitted distribution (points), and the ratio of the background expectation before the fit to the fitted distribution (dashed magenta line). The vertical bars indicate the statistical uncertainty on the data. The horizontal bars on the rightmost plot indicate the bin width. The uncertainty bands in both panels include the statistical and systematic uncertainties on the total background.  00013 The exclusion limits at 95\% \CL on the signal strength $\mu=\sigma/\sigma_{\text{th}}$ computed as a function of the mediator and dark matter mass, assuming a scalar (\cmsLeft) and pseudoscalar (\cmsRight) mediator. The mediator couplings are assumed to be $\gq=\Pg_{\chi}=1$. The dashed magenta lines represent the 68\% probability interval around the expected limit. The observed limit contour is almost coincident with the boundary of the 68\% probability interval.  00007 The exclusion limits at 95\% \CL on the signal strength $\mu=\sigma/\sigma_{\text{th}}$ computed as a function of the mediator and dark matter mass, assuming a scalar (\cmsLeft) and pseudoscalar (\cmsRight) mediator. The mediator couplings are assumed to be $\gq=\Pg_{\chi}=1$. The dashed magenta lines represent the 68\% probability interval around the expected limit. The observed limit contour is almost coincident with the boundary of the 68\% probability interval.  00012 The exclusion limits at 95\% \CL on the signal strength $\mu=\sigma/\sigma_{\text{th}}$ computed as a function of the mediator and dark matter mass, assuming a scalar (\cmsLeft) and pseudoscalar (\cmsRight) mediator. The mediator couplings are assumed to be $\gq=\Pg_{\chi}=1$. The dashed magenta lines represent the 68\% probability interval around the expected limit. The observed limit contour is almost coincident with the boundary of the 68\% probability interval.  00008 The exclusion limits at 95\% \CL on the signal strength $\mu=\sigma/\sigma_{\text{th}}$ computed as a function of the mediator and dark matter mass, assuming a scalar (\cmsLeft) and pseudoscalar (\cmsRight) mediator. The mediator couplings are assumed to be $\gq=\Pg_{\chi}=1$. The dashed magenta lines represent the 68\% probability interval around the expected limit. The observed limit contour is almost coincident with the boundary of the 68\% probability interval.  Fulltext  Fulltext

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20180718 10:00 

Search for $C\!P$ violation in $\Lambda^0_b \to p K^$ and $\Lambda^0_b \to p \pi^$ decays
/ LHCb Collaboration
A search for $C\!P$ violation in $\Lambda^0_b \to p K^$ and $\Lambda^0_b \to p \pi^$ decays is presented using a sample of $pp$ collisions collected with the LHCb detector and corresponding to an integrated luminosity of 3.0 fb$^{1}$. [...]
arXiv:1807.06544 ; LHCbPAPER2018025 ; CERNEP2018189 ; LHCBPAPER2018025.

2018.
00019 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are backgroundsubtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown.  00014 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are backgroundsubtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown.  00017 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are backgroundsubtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown.  00015 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are backgroundsubtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown.  00018 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are backgroundsubtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown.  00016 Distributions of (top) momentum, (middle) transverse momentum and (bottom) pseudorapidity for (left) protons from \Lb decays and (right) \Lb baryons. The distributions are backgroundsubtracted and normalised to unit area. Below each plot the ratio between the two distributions corresponding to \LbTopK and \LbToppi decays is also shown.  00013 Invariantmass distributions: (top left) $m_{\proton \Km}$, (top right) $m_{\antiproton \Kp}$, (bottom left) $m_{\proton \pim}$ and (bottom right) $m_{\antiproton \pip}$ for candidates passing the (top) \SpK and (bottom) \Sppi selections. The results of the fits are superimposed.  00011 Invariantmass distributions: (top left) $m_{\proton \Km}$, (top right) $m_{\antiproton \Kp}$, (bottom left) $m_{\proton \pim}$ and (bottom right) $m_{\antiproton \pip}$ for candidates passing the (top) \SpK and (bottom) \Sppi selections. The results of the fits are superimposed.  00010 Invariantmass distributions: (top left) $m_{\proton \Km}$, (top right) $m_{\antiproton \Kp}$, (bottom left) $m_{\proton \pim}$ and (bottom right) $m_{\antiproton \pip}$ for candidates passing the (top) \SpK and (bottom) \Sppi selections. The results of the fits are superimposed.  00012 Invariantmass distributions: (top left) $m_{\proton \Km}$, (top right) $m_{\antiproton \Kp}$, (bottom left) $m_{\proton \pim}$ and (bottom right) $m_{\antiproton \pip}$ for candidates passing the (top) \SpK and (bottom) \Sppi selections. The results of the fits are superimposed.  Fulltext  Related data file(s)  Supplementary Information  Fulltext  Fulltext

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