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A search for flaring very-high-energy cosmic γ-ray sources with the L3+C muon spectrometer
Achard, P.,Adriani, O.,Aguilar-Benitez, M.,van den Akker, M.,Alcaraz, J.,Alemanni, G.,Allaby, J.,Aloisio, A.,Alviggi, M.G.,Anderhub, H.,Andreev, V.P.,Anselmo, F.,Arefiev, A.,Azemoon, T.,Aziz, T.,Bagna Elsevier 2006 Astroparticle physics Vol.25 No.5
<P><B>Abstract</B></P><P>The L3+C muon detector at the CERN electron–positron collider, LEP, is used for the detection of very-high-energy cosmic γ-ray sources through the observation of muons of energies above 20, 30, 50 and 100GeV. Daily or monthly excesses in the rate of single-muon events pointing to some particular direction in the sky are searched for. The periods from mid July to November 1999, and April to November 2000 are considered. Special attention is also given to a selection of known γ-ray sources. No statistically significant excess is observed for any direction or any particular source.</P>
Search for an invisibly-decaying Higgs boson at LEP
Achard, P.,Adriani, O.,Aguilar-Benitez, M.,Alcaraz, J.,Alemanni, G.,Allaby, J.,Aloisio, A.,Alviggi, M.G.,Anderhub, H.,Andreev, V.P.,Anselmo, F.,Arefiev, A.,Azemoon, T.,Aziz, T.,Bagnaia, P.,Bajo, A.,Ba Elsevier 2005 Physics letters: B Vol.609 No.1
<P><B>Abstract</B></P><P>A search for a Higgs boson produced in <SUP>e+</SUP><SUP>e−</SUP> collisions in association with a Z boson and decaying into invisible particles is performed. Data collected at LEP with the L3 detector at centre-of-mass energies from 189 to 209 GeV are used, corresponding to an integrated luminosity of 0.63 fb<SUP>−1</SUP>. Events with hadrons, electrons or muons with visible masses compatible with a Z boson and missing energy and momentum are selected. They are consistent with the Standard Model expectations. A lower limit of 112.3 GeV is set at 95% confidence level on the mass of the invisibly-decaying Higgs boson in the hypothesis that its production cross section equals that of the Standard Model Higgs boson. Relaxing this hypothesis, upper limits on the production cross section are derived.</P>
A Radically Configurable Six-State Compound
Barnes, J. C.,Fahrenbach, A. C.,Cao, D.,Dyar, S. M.,Frasconi, M.,Giesener, M. A.,Benitez, D.,Tkatchouk, E.,Chernyashevskyy, O.,Shin, W. H.,Li, H.,Sampath, S.,Stern, C. L.,Sarjeant, A. A.,Hartlieb, K. American Association for the Advancement of Scienc 2013 Science Vol.339 No.6118
<P>Most organic radicals possess short lifetimes and quickly undergo dimerization or oxidation. Here, we report on the synthesis by radical templation of a class of air- and water-stable organic radicals, trapped within a homo[2]catenane composed of two rigid and fixed cyclobis(paraquat-p-phenylene) rings. The highly energetic octacationic homo[2]catenane, which is capable of accepting up to eight electrons, can be configured reversibly, both chemically and electrochemically, between each one of six experimentally accessible redox states (0, 2+, 4+, 6+, 7+, and 8+) from within the total of nine states evaluated by quantum mechanical methods. All six of the observable redox states have been identified by electrochemical techniques, three (4+, 6+, and 7+) have been characterized by x-ray crystallography, four (4+, 6+, 7+, and 8+) by electron paramagnetic resonance spectroscopy, one (7+) by superconducting quantum interference device magnetometry, and one (8+) by nuclear magnetic resonance spectroscopy.</P>
Investigation of radioactivity-induced backgrounds in EXO-200
Albert, J. B.,Auty, D. J.,Barbeau, P. S.,Beck, D.,Belov, V.,Benitez-Medina, C.,Breidenbach, M.,Brunner, T.,Burenkov, A.,Cao, G. F.,Chambers, C.,Cleveland, B.,Coon, M.,Craycraft, A.,Daniels, T.,Danilov American Physical Society 2015 PHYSICAL REVIEW C - Vol.92 No.1
Compton scattering of quasi-real virtual photons at LEP
Achard, P.,Adriani, O.,Aguilar-Benitez, M.,Alcaraz, J.,Alemanni, G.,Allaby, J.,Aloisio, A.,Alviggi, M.G.,Anderhub, H.,Andreev, V.P.,Anselmo, F.,Arefiev, A.,Azemoon, T.,Aziz, T.,Bagnaia, P.,Bajo, A.,Ba Elsevier 2005 Physics letters: B Vol.616 No.3
<P><B>Abstract</B></P><P>Compton scattering of quasi-real virtual photons, γ<SUP>e±</SUP>→γ<SUP>e±</SUP>, is studied with 0.6 fb<SUP>−1</SUP> of data collected by the L3 detector at the LEP <SUP>e+</SUP><SUP>e−</SUP> collider at centre-of-mass energies s=189–209 GeV. About 4500 events produced by the interaction of virtual photons emitted by <SUP>e±</SUP> of one beam with <SUP>e∓</SUP> of the opposite beam are collected for effective centre-of-mass energies of the photon–electron and photon–positron systems in the range from <SUP>s′</SUP>=35 GeV up to <SUP>s′</SUP>=175 GeV, the highest energy at which Compton scattering was ever probed. The cross sections of the γ<SUP>e±</SUP>→γ<SUP>e±</SUP> process as a function of <SUP>s′</SUP> and of the rest-frame scattering angle are measured, combined with previous L3 measurements down to <SUP>s′</SUP>≃20 GeV, and found to agree with the QED expectations.</P>
Achard, P.,Adriani, O.,Aguilar-Benitez, M.,van den Akker, M.,Alcaraz, J.,Alemanni, G.,Allaby, J.,Aloisio, A.,Alviggi, M.G.,Anderhub, H.,Andreev, V.P.,Anselmo, F.,Arefiev, A.,Azemoon, T.,Aziz, T.,Bagna Elsevier 2005 Astroparticle physics Vol.23 No.4
<P><B>Abstract</B></P><P>The shadowing of high-energy cosmic rays by the Moon has been observed with a significance of 9.4 standard deviations with the L3+C muon spectrometer at CERN. A significant effect of the Earth magnetic field is observed. Since no event deficit on the east side of the Moon has been observed, an upper limit at 90% confidence level on the antiproton to proton ratio of 0.11 is obtained for primary energies around 1TeV.</P>
Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP
Achard, P.,Adriani, O.,Aguilar-Benitez, M.,Alcaraz, J.,Alemanni, G.,Allaby, J.,Aloisio, A.,Alviggi, M.G.,Anderhub, H.,Andreev, V.P.,Anselmo, F.,Arefiev, A.,Azemoon, T.,Aziz, T.,Bagnaia, P.,Bajo, A.,Ba Elsevier 2005 Physics letters: B Vol.623 No.1
<P><B>Abstract</B></P><P>The evolution of the electromagnetic coupling, <I>α</I>, in the momentum-transfer range 1800 <SUP>GeV2</SUP><−<SUP>Q2</SUP><21600 <SUP>GeV2</SUP> is studied with about 40 000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies s=189–209 GeV. The running of <I>α</I> is parametrised as: [FORMULA OMISSION] where <SUB>α0</SUB>≡α(<SUP>Q2</SUP>=0) is the fine-structure constant and C=1 corresponds to the evolution expected in QED. A fit to the differential cross section of the <SUP>e+</SUP><SUP>e−</SUP>→<SUP>e+</SUP><SUP>e−</SUP> process for scattering angles in the range |cosθ|<0.9 excludes the hypothesis of a constant value of <I>α</I>, C=0, and validates the QED prediction with the result: [FORMULA OMISSION] where the first uncertainty is statistical and the second systematic.</P>
Z-boson production with two unobserved, back-to-back, hard photons at LEP
Achard, P.,Adriani, O.,Aguilar-Benitez, M.,Alcaraz, J.,Alemanni, G.,Allaby, J.,Aloisio, A.,Alviggi, M.G.,Anderhub, H.,Andreev, V.P.,Anselmo, F.,Arefiev, A.,Azemoon, T.,Aziz, T.,Bagnaia, P.,Bajo, A.,Ba Elsevier 2005 Physics letters: B Vol.613 No.3
<P><B>Abstract</B></P><P>The double-radiative process <SUP>e+</SUP><SUP>e−</SUP>→Zγγ→qq¯γγ where the two hard photons escape detection at low polar angles into opposite directions, is studied in 0.62 fb<SUP>−1</SUP> of data collected with the L3 detector at LEP at centre-of-mass energies between 188.6 and 209.2 GeV. The cross sections are measured and found to be consistent with the Standard Model expectations.</P>