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 
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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  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.  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.  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.  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.  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.  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.  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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20180718 05:30 

Robust Constraint on Lorentz Violation Using FermiLAT GammaRay Burst Data
/ Ellis, John (King's Coll. London ; CERN) ; Konoplich, Rostislav (New York U. (main) ; Manhattan Coll., Riverdale) ; Mavromatos, Nikolaos E. (King's Coll. London ; U. Valencia (main)) ; Nguyen, Linh (Manhattan Coll., Riverdale) ; Sakharov, Alexander S. (New York U. (main) ; Manhattan Coll., Riverdale ; CERN) ; SarkisyanGrinbaum, Edward K. (CERN ; Texas U., Arlington (main))
Models of quantum gravity suggest that the vacuum should be regarded as a medium with quantum structure that may have nontrivial effects on photon propagation, including the violation of Lorentz invariance. [...]
arXiv:1807.00189.

38 p.
Fulltext

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