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Search Results: 1 - 10 of 167614 matches for " E. Kabuss "
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Results on the nucleon spin structure
Eva-Maria Kabuss
Physics , 1999, DOI: 10.1007/s10582-999-0095-3
Abstract: SMC performed an investigation of the spin structure of the nucleon by measuring deep inelastic scattering of polarised muons off polarised protons and deuterons. A summary of the results for spin structure functions and sum rules is given.
COMPASS - a facility to study QCD
Eva-Maria Kabuss
Physics , 2011,
Abstract: An overview on the new COMPASS II experimental programme is presented. The main topics include a study of Primakoff reactions, generalised parton distributions via deeply virtual Compton scattering and transverse momentum dependent distributions in Drell-Yan processes in the pion scattering off polarised protons. Moreover, the studies of semi-inclusive deep inelastic scattering on unpolarised target will be continued.
Asymmetries from Semi-inclusive Polarized Deep Inelastic Scattering
Eva-Maria Kabuss
Physics , 1997, DOI: 10.1063/1.53728
Abstract: The analysis of semi-inclusive data from deep inelastic scattering of polarized muons off polarized protons and deuterons by the SMC is presented. The resulting charged hadron asymmetries are used to determine polarized valence and sea quark distributions and their contributions to the nucleon spin. In addition, a new approach to derive inclusive asymmetries is discussed.
Final results from the NMC
Eva-Maria Kabuss
Physics , 1997, DOI: 10.1063/1.53714
Abstract: A summary of the results on deep inelastic muon nucleon and muon nucleus scattering experiments performed by the NMC collaboration is presented.
Future Polarised DIS Fixed Target Experiments
Eva-Maria Kabuss
Physics , 1999, DOI: 10.1016/S0920-5632(99)00793-8
Abstract: New experiments in polarised deep inelastic scattering will mainly concentrate on the measurement of semi-inclusive asymmetries. Especially, the upgraded HERMES experiment at DESY and the newly build COMPASS experiment at CERN will investigate the gluon polarisation via open charm and high p_T hadron pair production, study in detail the flavour decomposition of the quark helicity distributions and measure the tranversity distributions with tranversely polarised targets.
A luminosity monitor for the A4 parity violation experiment at MAMI
T. Hammel,P. Achenbach,S. Baunack,L. Capozza,J. Diefenbach,K. Grimm,D. vonHarrach,Y. Imai,E. Kabuss,R. Kothe,J. H. Lee,A. LopesGinja,F. E. Maas,A. SanchezLorente,E. Schilling,G. Stephan,C. Weinrich,I. Altarev
Physics , 2005, DOI: 10.1016/j.nima.2006.03.028
Abstract: A water Cherenkov luminosity monitor system with associated electronics has been developed for the A4 parity violation experiment at MAMI. The detector system measures the luminosity of the hydrogen target hit by the MAMI electron beam and monitors the stability of the liquid hydrogen target. Both is required for the precise study of the count rate asymmetries in the scattering of longitudinally polarized electrons on unpolarized protons. Any helicity correlated fluctuation of the target density leads to false asymmetries. The performance of the luminosity monitor, investigated in about 2000 hours with electron beam, and the results of its application in the A4 experiment are presented.
A high power liquid hydrogen target for the Mainz A4 parity violation experiment
I. Altarev,E. Schilling,S. Baunack,L. Capozza,J. Diefenbach,K. Grimm,Th. Hammel,D. vonHarrach,Y. Imai,E. M. Kabuss,R. Kothe,J. H. Lee,A. LopesGinja,F. E. Maas,A. SanchezLorente,G. Stephan,C. Weinrich
Physics , 2005, DOI: 10.1016/j.nima.2006.03.022
Abstract: We present a new powerful liquid hydrogen target developed for the precise study of parity violating electron scattering on hydrogen and deuterium. This target has been designed to have minimal target density fluctuations under the heat load of a 20$\mu$A CW 854.3 MeV electron beam without rastering the electron beam. The target cell has a wide aperture for scattered electrons and is axially symmetric around the beam axis. The construction is optimized to intensify heat exchange by a transverse turbulent mixing in the hydrogen stream, which is directed along the electron beam. The target is constructed as a closed loop circulating system cooled by a helium refrigerator. It is operated by a tangential mechanical pump with an optional natural convection mode. The cooling system supports up to 250 watts of the beam heating removal. Deeply subcooled liquid hydrogen is used for keeping the in-beam temperature below the boiling point. The target density fluctuations are found to be at the level 10$^{-3}$ at a beam current of 20 $\mu$A.
Deterministic and Robust Entanglement of Nitrogen Vacancy Centers using Low-Q Photonic Crystal Cavities
Janik Wolters,Julia Kabuss,Andreas Knorr,Oliver Benson
Physics , 2014, DOI: 10.1103/PhysRevA.89.060303
Abstract: We propose an experiment to generate deterministic entanglement between separate nitrogen vacancy (NV) centers mediated by the mode of a photonic crystal cavity. Using numerical simulations the applicability and robustness of the entanglement operation to parameter regimes achievable with present technology is investigated. We find that even with moderate cavity Q-factors of $10^{4}$ a concurrence of $c>0.6$ can be achieved within a time of $t_{max}\approx150$~ns, while Q-factors of $10^{5}$ promise $c>0.8$. Most importantly, the investigated scheme is relative insensitive to spectral diffusion and differences between the optical transitions frequencies of the used NV centers.
Measurement of Strange Quark Contributions to the Nucleon's Form Factors at Q^2=0.230 (GeV/c)^2
A4 Collaboration,F. E. Maas,P. Achenbach,K. Aulenbacher,S. Baunack,L. Capozza,J. Diefenbach,K. Grimm,Y. Imai,T. Hammel,D. von Harrach,E. -M. Kabuss,R. Kothe,J. H. Lee,A. Lorente,A. Lopes Ginja,L. Nungesser,E. Schilling,G. Stephan,C. Weinrich,I. Altarev,J. Arvieux,B. Collin,R. Frascaria,M. Guidal,R. Kunne,D. Marchand,M. Morlet,S. Ong,J. van de Wiele,S. Kowalski,B. Plaster,R. Suleiman,S. Taylor
Physics , 2004, DOI: 10.1103/PhysRevLett.93.022002
Abstract: We report on a measurement of the parity-violating asymmetry in the scattering of longitudinally polarized electrons on unpolarized protons at a $Q^2$ of 0.230 (GeV/c)^2 and a scattering angle of \theta_e = 30^o - 40^o. Using a large acceptance fast PbF_2 calorimeter with a solid angle of \Delta\Omega = 0.62 sr the A4 experiment is the first parity violation experiment to count individual scattering events. The measured asymmetry is A_{phys} =(-5.44 +- 0.54_{stat} +- 0.27_{\rm sys}) 10^{-6}. The Standard Model expectation assuming no strangeness contributions to the vector form factors is $A_0=(-6.30 +- 0.43) 10^{-6}$. The difference is a direct measurement of the strangeness contribution to the vector form factors of the proton. The extracted value is G^s_E + 0.225 G^s_M = 0.039 +- 0.034 or F^s_1 + 0.130 F^s_2 = 0.032 +- 0.028.
Bunching and anti-bunching in electronic transport
Clive Emary,Christina P?ltl,Alexander Carmele,Julia Kabuss,Andreas Knorr,Tobias Brandes
Physics , 2012, DOI: 10.1103/PhysRevB.85.165417
Abstract: In quantum optics the $g^{(2)}$-function is a standard tool to investigate photon emission statistics. We define a $g^{(2)}$-function for electronic transport and use it to investigate the bunching and anti-bunching of electron currents. Importantly, we show that super-Poissonian electron statistics do not necessarily imply electron bunching, and that sub-Poissonian statistics do not imply anti-bunching. We discuss the information contained in $g^{(2)}(\tau)$ for several typical examples of transport through nano-structures such as few-level quantum dots.
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