1,649 research outputs found
NA64 Status Report 2018
No full textThe experiment NA64 is aimed at a search for a sub-GeV vector mediator (called dark photon A′) of Dark Matter production at the CERN SPS. . The main goal in 2017 was to probe a region of the A′ parameter space of the thermal dark matter model. Ongoing activities on the detector and data analysis are reviewed. The status and results from the NA64 runs in 2016 and 2017 are reported. First results on the search for the X->e+e− decay of a 17 MeV X boson, which could explain the recently observed excess of e+e-pairs from the excited 8Be nucleus transitions, and A'-> e+e- decays are also presented. Ongoing analysis on the decays of axion-like particles and plans for further searches beyond LS2 are also discussed
Test Run Report of the P348 Collaboration
No full textThe P348 Collaboration preformed test measurements in the H4 SPS beam line during a period of 2 weeks in September-October. The measurements were designed with two main objectives. The first was to test the new detector components such as Micromegas and straw tube tracker, high-energy electron tagging system, ECAL, and HCAL. The second was to explore the feasibility of searching for invisible decays of dark photons in the sub- GeV mass range. Here we report various results of the test measurements. The main outcome of the run is that by using simple selection criteria, without good track definition, we reject background in the signal region down to the level of a few ×10^−8 per incident electron. As we do not see any other issues that represent fundamental problems for the experiment, our conclusion is that after small modifications the P348 detector is ready to start data taking in the year 2016. We recall that the A‘ with a mass in sub-GeV range is still one of the favorable explanation of the muon g-2 anomaly. This mass range is not yet probed by the direct experimental searches. Accumulation of about ≃ 5 × 10^9 e−s would allow either to observed A‘ or completely exclude this explanation for the discrepancy next year
On Search for eV Hidden Sector Photons in Super-Kamiokande and CAST Experiments.
No full textAbstractIf light hidden sector photons (γ′s) exist, they could be produced through kinetic mixing with solar photons in the eV energy range. We propose to search for this hypothetical γ′-flux with the Super-Kamiokande and/or upgraded CAST detectors. The proposed experiments are sensitive to the γ–γ′ mixing strength as small as 10−5≳χ≳10−9 for the γ′ mass region 10−4≲mγ′≲10−1 eV and, in the case of non-observation, would improve limits recently obtained from photon regeneration laser experiments for this mass region
Limits on the magnetic moment of sterile neutrino and two-photon neutrino decay
No full textIt is shown that the non-zero transition magnetic moment () between the sterile neutrino () and the muon neutrino () could be effectively searched for via the Primakoff effect, in the process of nucleus , with the subsequent decay. From the recent results of the NOMAD neutrino detector at CERN a model-independent constraint of is obtained. The limit is valid for neutrino masses up to .It is shown that the non-zero transition magnetic moment () between the sterile neutrino () and the muon neutrino () could be effectively searched for via the Primakoff effect, in the process of conversion in the external Coulomb field of a nucleus , with the subsequent decay. From the recent results of the NOMAD neutrino detector at CERN a model-independent constraint of is obtained. The limit is valid for neutrino masses up to .It is shown that the non-zero transition magnetic moment () between the sterile neutrino () and the muon neutrino () could be effectively searched for via the Primakoff effect, in the process of conversion in the external Coulomb field of a nucleus , with the subsequent decay. From the recent results of the NOMAD neutrino detector at CERN a model-independent constraint of is obtained. The limit is valid for neutrino masses up to .It is shown that the non-zero transition magnetic moment ( μ tran ) between the sterile neutrino ( ν s ) and the muon neutrino ( ν μ ) could be effectively searched for via the Primakoff effect, in the process of ν μ Z → ν s Z conversion in the external Coulomb field of a nucleus Z , with the subsequent ν s → ν μ + γ decay. From the recent results of the NOMAD neutrino detector at CERN a model-independent constraint of μ tran 2×10 13 s/ m ν 7 MeV) is obtained. The limit is valid for neutrino masses up to m ν ∼ O (1) GeV
Probing color coherence effects in pp collisions at √s = 7 TeV
No full textOpen Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the
source are credited. Funded by SCOAP3 / License Version CC BY 4.0.A study of color coherence effects in pp collisions at a center-of-mass energy of 7TeV is presented. The data used in the analysis were collected in 2010 with the CMS detector at the LHC and correspond to an integrated luminosity of 36 pb-1. Events are selected that contain at least three jets and where the two jets with the largest transverse momentum exhibit a back-to-back topology. The measured angular correlation between the second- and third-leading jet is shown to be sensitive to color coherence effects, and is compared to the predictions of Monte Carlo models with various implementations of color coherence. None of the models describe the data satisfactorily.BMWF and FWF (Austria); FNRS and FWO(Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil);MES
(Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF(Cyprus); MoER, SF0690030s09 and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland);
CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Republic of
Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, andUASLPFAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS and RFBR(Russia);MESTD (Serbia); SEIDI and CPAN(Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); ThEPCenter, IPST, STAR and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA)
Measurement of WZ and ZZ production in pp collisions at √s = 8 TeV in final states with b-tagged jets
No full textOpen Access This article is distributed under the terms of the Creative
Commons Attribution License which permits any use, distribution, and
reproduction in any medium, provided the original author(s) and the
source are credited.
Funded by SCOAP3 / License Version CC BY 4.0.Measurements are reported of the WZ and ZZ production cross sections in proton-proton collisions at s √ =8 TeV in final states where one Z boson decays to b-tagged jets. The other gauge boson, either W or Z, is detected through its leptonic decay (either W→eν , μν or Z→e + e − , μ + μ − , or νν ¯ ). The results are based on data corresponding to an integrated luminosity of 18.9 fb −1 collected with the CMS detector at the Large Hadron Collider. The measured cross sections, σ(pp→WZ)=30.7±9.3(stat.)±7.1(syst.)±4.1(th.)±1.0(lum.)pb and σ(pp→ZZ)=6.5±1.7(stat.)±1.0(syst.)±0.9(th.)±0.2(lum.)pb , are consistent with next-to-leading order quantum chromodynamics calculationsBMWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil);
MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CS (Croatia); RPF (Cyprus); MoER, SF0690030s09 and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF(Germany);GSRT(Greece);OTKAand NIH(Hungary);DAEand DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Republic of Korea); LAS (Lithuania);MOE and UM(Malaysia); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS and RFBR (Russia); MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland);
NSC (Taipei); ThEPCenter, IPST, STAR and NSTDA(Thailand); TUBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA)
WATER+TOWN MARINA BRUNENSIS
No full textV území jsem se snažila pochopit existující funkční uspořádání a ve svém návrhu předložit novou strukturu. Jachtařský a veslařský klub umístit do jednoho centra, současný areál námořního jachtingu přeměnit na parkoviště a volné travnaté plochy. Zde také bude umístěno molo pro ukotvení jachet a plachetnic. Plocha na parkování jachet přes zimu by se přesunula do severní části areálu blízko loděnic. Hlavní budova centra a loděnice jsou umístěny podél areálu, takovým způsobem necháváme prostor pro další tribuny a zelené plochy na dočasné umístění lodě během dne a jejich přípravu k závodům. Severní část areálu představuje parkování jachet přes zimu a plochy pro opravy lodě s přístupem k loděnicím.Entering the draft thesis of the premises and shipyards Rowing Sports Club Brno (LSB) and the location here of a new water sports center. Solved building water sports center in the shape of the prism of the dam turns its main eastern front straight. The main architectural expression - jacket walkway roof and creates a system of ramps, which can enter from the sidewalk and proceed to the lowest part of which overlook the resort center.
LSND/MiniBooNe excess events and heavy neutrino from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>μ</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>decays
No full textDesign of a High-Efficiency Pulsed Positron Beam for Experiments with Orthopositronium in Vacuum
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