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PH-EP Articles

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2015-12-02
10:24
Search for the lepton-flavour violating decay $D^0 \to e^\pm\mu^\mp$ / LHCb Collaboration
A search for the lepton-flavour violating decay $D^0 \to e^\pm \mu^\mp$ is made with a dataset corresponding to an integrated luminosity of $3.0$ fb$^{-1}$ of proton-proton collisions at centre-of-mass energies of $7$ TeV and $8$ TeV, collected by the LHCb experiment. Candidate $D^0$ mesons are selected using the decay $D^{*+} \to D^0 \pi^+$ and the $D^0 \to e^\pm \mu^\mp$ branching fraction is measured using the decay mode $D^0 \to K^- \pi^+$ as a normalisation channel. [...]
arXiv:1512.00322; LHCB-PAPER-2015-048; CERN-PH-EP-2015-306.- Geneva : CERN, 2016 - 19 p. - Published in : Phys. Lett. B 754 (2016) 167 Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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2015-11-02
12:11
Dijet production in $\sqrt{s}=7$ TeV $pp$ collisions with large rapidity gaps at the ATLAS experiment / ATLAS Collaboration
A $6.8 \ {\mathrm nb^{-1}}$ sample of $pp$ collision data collected under low-luminosity conditions at $\sqrt{s} = 7$ TeV by the ATLAS detector at the Large Hadron Collider is used to study diffractive dijet production. Events containing at least two jets with $p_\mathrm{T} > 20$ GeV are selected and analysed in terms of variables which discriminate between diffractive and non-diffractive processes. [...]
CERN-PH-EP-2015-227; arXiv:1511.00502.- Geneva : CERN, 2016 - 17 p. - Published in : Phys. Lett. B 754 (2016) 214 Fulltext: PDF; External links: Previous draft version; Preprint

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2015-10-22
11:15
Search for a very light NMSSM Higgs boson produced in decays of the 125 GeV scalar boson and decaying into $\tau$ leptons in pp collisions at $\sqrt{s} =$ 8 TeV / CMS Collaboration
A search for a very light Higgs boson decaying into a pair of $\tau$ leptons is presented within the framework of the next-to-minimal supersymmetric standard model. This search is based on a data set corresponding to an integrated luminosity of 19.7 fb$^{-1}$ of proton-proton collisions collected by the CMS experiment at a centre-of-mass energy of 8 TeV. [...]
arXiv:1510.06534; CMS-HIG-14-019; CERN-PH-EP-2015-264.- Geneva : CERN, 2016 - 44 p. - Published in : J. High Energy Phys. 01 (2016) 079 Fulltext: PDF; External link: Preprint

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2015-10-21
10:33
Measurement of the correlations between the polar angles of leptons from top quark decays in the helicity basis at $\sqrt{s}=7$ TeV using the ATLAS detector / ATLAS Collaboration
A measurement of the correlations between the polar angles of leptons from the decay of pair-produced $t$ and $\bar{t}$ quarks in the helicity basis is reported, using proton-proton collision data collected by the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 4.6 fb$^{-1}$ at a center-of-mass energy of $\sqrt{s}=7$ TeV collected during 2011. [...]
CERN-PH-EP-2015-241; arXiv:1510.07478.- Geneva : CERN, 2016 - 17 p. - Published in : Phys. Rev. D 93 (2016) 012002 Fulltext: PDF; External links: Previous draft version; Preprint

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2015-10-19
07:24
Search for the rare decays $B^{0}\to J/\psi \gamma$ and $B^{0}_{s} \to J/\psi \gamma$ / LHCb collaboration
A search for the rare decay of a $B^{0}$ or $B^{0}_{s}$ meson into the final state $J/\psi\gamma$ is performed, using data collected by the LHCb experiment in $pp$ collisions at $\sqrt{s}=7$ and $8$ TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$. The observed number of signal candidates is consistent with a background-only hypothesis. [...]
arXiv:1510.04866; LHCB-PAPER-2015-044; CERN-PH-EP-2015-276.- Geneva : CERN, 2015 - 17 p. - Published in : Phys. Rev. D 92 (2015) 112002 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2015-10-15
08:14
Evidence for the strangeness-changing weak decay $\Xi_b^-\to\Lambda_b^0\pi^-$ / LHCb collaboration
Using a $pp$ collision data sample corresponding to an integrated luminosity of 3.0~fb$^{-1}$, collected by the LHCb detector, we present the first search for the strangeness-changing weak decay $\Xi_b^-\to\Lambda_b^0\pi^-$. No $b$ hadron decay of this type has been seen before. [...]
arXiv:1510.03829; LHCB-PAPER-2015-047; CERN-PH-EP-2015-277.- 2015 - 7 p. - Published in : Phys. Rev. Lett. 115 (2015) 241801 APS Open Access article: PDF; Fulltext: PDF; External link: Preprint

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2015-10-15
08:14
Measurement of the production cross-section of a single top quark in association with a $W$ boson at 8 TeV with the ATLAS experiment / ATLAS Collaboration
The cross-section for the production of a single top quark in association with a $W$ boson in proton--proton collisions at $\sqrt{s}= 8$ TeV is measured. The dataset corresponds to an integrated luminosity of 20.3 fb$^{-1}$, collected by the ATLAS detector in 2012 at the Large Hadron Collider at CERN. [...]
arXiv:1510.03752; CERN-PH-2015-230; CERN-PH-EP-2015-230.- Geneva : CERN, 2016 - 33 p. - Published in : J. High Energy Phys. 01 (2016) 064 Fulltext: PDF; External links: Preprint; Previous draft version

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2015-10-14
22:05
Search for a light charged Higgs boson decaying to $ \mathrm{ c \bar{s} } $ in pp collisions at $ \sqrt{s} =$ 8 TeV / CMS Collaboration
A search for a light charged Higgs boson, originating from the decay of a top quark and subsequently decaying into a charm quark and a strange antiquark, is presented. The data used in the analysis correspond to an integrated luminosity of 19.7 fb$^{-1}$ recorded in proton-proton collisions at $\sqrt{s}= $ 8 TeV by the CMS experiment at the LHC. [...]
arXiv:1510.04252; CMS-HIG-13-035; CERN-PH-EP-2015-266.- Geneva : CERN, 2015 - 36 p. - Published in : J. High Energy Phys. 12 (2015) 178 Fulltext: PDF; External link: Preprint

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2015-10-13
07:54
Transverse momentum spectra of b jets in pPb collisions at $\sqrt{ s_{\mathrm{NN}} } =$ 5.02 TeV / CMS Collaboration
We present a measurement of b jet transverse momentum ($ p_{\mathrm{T}} $) spectra in proton-lead (pPb) collisions using a dataset corresponding to about 35 nb$^{-1}$ collected with the CMS detector at the LHC. Jets from b quark fragmentation are found by exploiting the long lifetime of hadrons containing a b quark through tagging methods using distributions of the secondary vertex mass and displacement. [...]
arXiv:1510.03373; CMS-HIN-14-007; CERN-PH-EP-2015-205.- Geneva : CERN, 2016 - 32 p. - Published in : Phys. Lett. B 754 (2016) 59 Fulltext: PDF; External link: Preprint

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2015-10-08
08:21
A model-independent confirmation of the $Z(4430)^-$ state / LHCb collaboration
The decay $B^0\to \psi(2S) K^+\pi^-$ is analyzed using $\rm 3~fb^{-1}$ of $pp$ collision data collected with the LHCb detector. A model-independent description of the $\psi(2S) \pi$ mass spectrum is obtained, using as input the $K\pi$ mass spectrum and angular distribution derived directly from data, without requiring a theoretical description of resonance shapes or their interference. [...]
arXiv:1510.01951; CERN-PH-EP-2015-244; LHCB-PAPER-2015-038.- 2015 - Published in : Phys. Rev. D 92 (2015) 112009 Fulltext: PDF; External link: Preprint

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