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2018-07-18
10:00
Search for $C\!P$ violation in $\Lambda^0_b \to p K^-$ and $\Lambda^0_b \to p \pi^-$ decays
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$^{-1}$. [...]
CERN-EP-2018-189 ; LHCB-PAPER-2018-025. - 2018.
Fulltext - Related data file(s) - Supplementary Information

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2018-07-18
05:30
Robust Constraint on Lorentz Violation Using Fermi-LAT Gamma-Ray 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) ; Sarkisyan-Grinbaum, 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 non-trivial effects on photon propagation, including the violation of Lorentz invariance. [...]
arXiv:1807.00189. - 38 p.
Fulltext

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2018-07-18
05:29
Topology classification with deep learning to improve real-time event selection at the LHC / Nguyen, Thong Q. (Caltech) ; Weitekamp, Daniel (UC, Berkeley) ; Anderson, Dustin (Caltech) ; Castello, Roberto (CERN) ; Cerri, Olmo (Caltech) ; Pierini, Maurizio (CERN) ; Spiropulu, Maria (Caltech) ; Vlimant, Jean-Roch (Caltech)
We show how event topology classification based on deep learning could be used to improve the purity of data samples selected in real time at at the Large Hadron Collider. [...]
arXiv:1807.00083. - 15 p.
Full text

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2018-07-18
05:29
Sterile Neutrinos with Secret Interactions -- Cosmological Discord? / Chu, Xiaoyong (Vienna, OAW) ; Dasgupta, Basudeb (Tata Inst.) ; Dentler, Mona (Mainz U., Inst. Phys. ; U. Mainz, PRISMA) ; Kopp, Joachim (Mainz U., Inst. Phys. ; U. Mainz, PRISMA ; CERN) ; Saviano, Ninetta (Mainz U., Inst. Phys. ; U. Mainz, PRISMA)
Several long-standing anomalies from short-baseline neutrino oscillation experiments -- most recently corroborated by new data from MiniBooNE -- have led to the hypothesis that extra, 'sterile', neutrino species might exist. [...]
15 p.
Full text

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2018-07-17
17:40
Search for lepton-flavor violation in different-flavor, high-mass final states in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
A search is performed for a heavy particle decaying into different-flavor, dilepton pairs ($e\mu$, $e\tau$ or $\mu\tau$), using 36.1 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV collected in 2015-2016 by the ATLAS detector at the Large Hadron Collider. [...]
CERN-EP-2018-137. - 2018.
Fulltext - Previous draft version

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2018-07-17
14:06
Search for the Higgs boson decaying to two muons in proton-proton collisions at $\sqrt{s} = $ 13 TeV
A search for the Higgs boson decaying to two oppositely charged muons is presented using data recorded by the CMS experiment at the CERN LHC in 2016 at a center-of-mass energy $\sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. [...]
CERN-EP-2018-165 ; CMS-HIG-17-019-003. - 2018.
Additional information for the analysis - CMS AuthorList - Fulltext

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2018-07-17
10:43
Search and measurement of the SM Higgs boson / Donato, Silvio (Zurich U.) /ATLAS and CMS Collaborations
After the success of the LHC Run-1 physics program, the ATLAS and CMS Collaborations have presented their results obtained with the first $\sim 36\,\textnormal{fb}^{-1}$ of integrated luminosity delivered by the LHC at $\sqrt{s} = 13\,\textnormal{TeV}$ in Run-2. We present the main results obtained on the Standard Model Higgs boson, including the searches for specific decay and production channels, and the measurements of the Higgs boson couplings and differential cross section..
CMS-CR-2018-114.- Geneva : CERN, 2018 - 10 p. Fulltext: PDF;
In : XXXII Rencontres de Physique de La Vallée d'Aoste, La Thuile(ao), Italy, 25 Feb - 3 Mar 2018

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2018-07-17
09:40
Measurements of the differential jet cross section as a function of the jet mass in dijet events from proton-proton collisions at $\sqrt{s} = $ 13 TeV
Measurements of the differential jet cross section are presented as a function of jet mass in dijet events, in bins of jet transverse momentum, with and without a jet grooming algorithm. [...]
CERN-EP-2018-180 ; CMS-SMP-16-010-003. - 2018.
Additional information for the analysis - CMS AuthorList - Fulltext

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2018-07-17
04:15
Limits on Neutrino Lorentz Violation from Multimessenger Observations of TXS 0506+056 / Ellis, John ; Mavromatos, Nikolaos E. ; Sakharov, Alexander S. ; Sarkisyan-Grinbaum, Edward K.
The observation by the IceCube Collaboration of a high-energy ($E \gtrsim 200$ TeV) neutrino from the direction of the blazar TXS 0506+056 and the coincident observations of enhanced $\gamma$-ray emissions from the same object by MAGIC and other experiments can be used to set stringent constraints on Lorentz violation in the propagation of neutrinos that is linear in the neutrino energy: $\Delta v = - E/M_1$, where $\Delta v$ is the deviation from the velocity of light, and $M_1$ is an unknown high energy scale to be constrained by experiment. [...]
arXiv:1807.05155 ; KCL-PH-TH/2018-37 ; CERN-TH/2018-166. - 9 p.
Fulltext - Fulltext

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2018-07-17
04:14
Factorization of two-particle distributions in AMPT simulations of Pb-Pb collisions at $\mathbf{\sqrt{s_{\text{NN}}}} $ = 5.02 TeV / Bourjau, Christian
The flow ansatz states that the single-particle distribution of a given event can be described in terms of the complex flow coefficients $V_n$. [...]
arXiv:1807.05004. - 8 p.
Full text - 00008 Factorization of \hvssee according to Model A without the use of a \detagap based on AMPT simulations. Left: The flow coefficients yielded by the minimization procedure. Right: Factorization ratio for the solution shown on the left. The found solution fails to describe the short-range and long-range pairs. - 00013 Empirical decorrelation parameter $F_2^\eta$ for AMPT model calculations of Pb--Pb collisions at $\snn = \SI{5.02}{TeV}$. The simulation is compared to measurements by the CMS collaboration for $\snn = \SI{2.76}{TeV}$. - 00007 The two-particle Fourier coefficients \hvssee{} from AMPT calculations of Pb--Pb collisions at \SI{5.02}{TeV} with a centrality of 20--40\%. The measurement of the two-particle Fourier coefficients is conducted for every point in the \eeplane independently. - 00011 Factorization ratio for Model A (left) and Model B (right) with $|\deta| > 3$ in both cases. Either model provides good agreement for $|\deta|>3$, while the short-range region is better described by Model B. - 00009 Factorization of \hvssee according to Model A without the use of a \detagap based on AMPT simulations. Left: The flow coefficients yielded by the minimization procedure. Right: Factorization ratio for the solution shown on the left. The found solution fails to describe the short-range and long-range pairs. - 00010 Factorization ratio for Model A (left) and Model B (right) with $|\deta| > 3$ in both cases. Either model provides good agreement for $|\deta|>3$, while the short-range region is better described by Model B. - 00012 Projection of the factorization ratios of various centralities onto \deta. A \detagap of $3$ was imposed during the factorization procedure with Model A. The shown uncertainties are statistical. - Fulltext

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