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671.
B.Golob for the Belle Collaboration Jozef Stefan Institute Faculty of Mathematics Physics Univ.of Ljubljana Ljubljana Slovenia 《中国物理 C》2008,(6)
We present a preliminary measurement of the B(D_s→μν_μ)with the Belle experiment at the KEKB collider.We select D~s→μV_μdecays with a method that provides a high-purity of the selected sample and an absolute measurement of the branching fraction.The results are based on a data sample of 550 fb~(-1)and are compared to similar measurements by other experiments as well as to the predictions of LQCD.We conclude with short prospects for improvements in the accuracy of the measurement. 相似文献
672.
T. Skorodko E. Doroshkevich O. Khakimova F. Kren G.J. Wagner for the CELSIUS-WASA Collaboration 《Progress in Particle and Nuclear Physics》2008,61(1):168-169
In most investigations the Roper resonance is sensed only very indirectly via complex partial wave analyses. We find indications for its excitation in the pp→npπ+ reaction, where some resonance-like structure is observed in the invariant nπ+ mass spectrum at with a width of 150 MeV. The values fit very favorably to the most recent phase shift results as well as to the observations at BES. In near-threshold two-pion production pp→ppπ0π0 the Roper excitation and its subsequent decay into Nππ is the only dominant process. There we find its decay into the Nσ channel as the dominating decay process — in favor of a monopole nature of the Roper excitation. 相似文献
673.
Fujiwara MC Amoretti M Amsler C Bonomi G Bouchta A Bowe PD Canali C Carraro C Cesar CL Charlton M Doser M Fontana A Funakoshi R Genova P Hangst JS Hayano RS Jørgensen LV Kellerbauer A Lagomarsino V Landua R Lodi-Rizzini E Macri M Madsen N Manuzio G Mitchard D Montagna P Pruys H Regenfus C Rotondi A Testera G Variola A Venturelli L van der Werf DP Yamazaki Y Zurlo N;ATHENA Collaboration 《Physical review letters》2008,101(5):053401
We demonstrate temporally controlled modulation of cold antihydrogen production by periodic RF heating of a positron plasma during antiproton-positron mixing in a Penning trap. Our observations have established a pulsed source of atomic antimatter, with a rise time of about 1 s, and a pulse length ranging from 3 to 100 s. Time-sensitive antihydrogen detection and positron plasma diagnostics, both capabilities of the ATHENA apparatus, allowed detailed studies of the pulsing behavior, which in turn gave information on the dependence of the antihydrogen production process on the positron temperature T. Our data are consistent with power law scaling T (-1.1+/-0.5) for the production rate in the high temperature regime from approximately 100 meV up to 1.5 eV. This is not in accord with the behavior accepted for conventional three-body recombination. 相似文献
674.
Beane SR Detmold W Luu TC Orginos K Savage MJ Torok A;NPLQCD Collaboration 《Physical review letters》2008,100(8):082004
The ground-state energies of 2, 3, 4, and 5 pi(+)'s in a spatial volume V approximately (2.5 fm)(3) are computed with lattice QCD. By eliminating the leading contribution from three-pi(+) interactions, particular combinations of these n-pi(+) ground-state energies provide precise extractions of the pi(+)pi(+) scattering length in agreement with that obtained from calculations involving only two pi(+)'s. The three-pi(+) interaction can be isolated by forming other combinations of the n-pi(+) ground-state energies. We find a result that is consistent with a repulsive three-pi(+) interaction for m_(pi) less, similar352 MeV. 相似文献
675.
A. V. Derbin K. A. Fomenko On behalf of the Borexino Collaboration 《Physics of Atomic Nuclei》2010,73(12):2064-2073
The Pauli exclusion principle was tested for nucleons in the 12C nucleus by using data from the Borexino detector. The approach used consisted in seeking photons, neutrons, and protons,
as well as electrons and positrons, emitted in the Pauli-forbidden transitions of nucleons from the 1P
3/2 shell to the filled 1S
1/2 shell. Owing to a uniquely low background level in the Borexino detector and its large mass, the currently most stringent
experimental limits were obtained for the probabilities and relative intensities of Pauli-forbidden transitions for the electromagnetic,
strong, and weak channels. 相似文献
676.
E. A. Bogomolov G. I. Vasilyev W. Menn PAMELA Collaboration 《Physics of Atomic Nuclei》2018,81(3):390-395
Preliminary results of measurements of the solar modulation of the isotopic hydrogen and helium content in galactic cosmic rays are presented for the first time. These data were obtained between 2006 and 2014 in the PAMELA international orbital experiment via measuring the time of flight of nuclei in the Pamela scintillation telescope and via analyzing, in the multilayered calorimeter of the PAMELA magnetic spectrometer, ionization losses of nuclei whose rigidity was known from trajectory measurements and which traversed the instrument without undergoing nuclear interactions. The results of these measurements are compared with existing experimental and calculated data, which are quite scanty. 相似文献
677.
S. Barlag P. van Dam E. De Wolf B. Jongejans A. Tenner C. Visser R. Wigmans P. Capiluppi F. Fabbri G. Giacomelli G. Mandrioli P. Mazzanti A. M. Rossi P. Serra-Lugaresi M. Baldo-Ceolin F. Bobisut E. Calimani S. Ciampolillo H. Huzita C. Angelini L. Bertanza A. Bigi R. Casali R. Fantechi V. Flaminio A. Nappi R. Pazzi C. Petri G. Pierazzini M. Bloch T. Bolognese J. Derkaoui M. L. Faccini-Turluer A. Fridman C. Louedec L. Mosca J. Saudraix D. Vignaud D. Allasia F. Bianchi V. Bisi D. Gamba A. Marzari-Chiesa L. Ramello L. Riccati A. Romero Amsterdam-Bologna-Padova-Pisa-Saclay-Torino Collaboration 《Zeitschrift fur Physik C Particles and Fields》1982,11(4):283-292
Charged hadron multiplicity distributions in \(\bar v_\mu n\) and \(\bar v_\mu p\) interactions in the energy range \(5< E_{\bar v}< 150GeV\) GeV are presented. They are obtained from about \(6000\bar v_\mu \) charged current events produced in BEBC filled with deuterium. Multiplicity moments are studied as a function of the invariant mass of the hadronic systemW. Results on multiplicity distributions in the forward and backward directions in the hadronic c.m.s. are presented and discussed within the framework of the quark parton model. Values for the average charge of the forward jet are also determined and compared with other experimental data. 相似文献
678.
The High-Altitude Water Cherenkov (HAWC) observatory is a large field of view, continuously operated, TeV γ-ray experiment under construction at 4,100 m a.s.l. in Mexico. The HAWC observatory will have an order of magnitude better sensitivity, angular resolution, and background rejection than its predecessor, the Milagro experiment. The improved performance will allow us to detect both the transient and steady emissions, to study the Galactic diffuse emission at TeV energies, and to measure or constrain the TeV spectra of GeV γ-ray sources. In addition, HAWC will be the only ground-based instrument capable of detecting prompt emission from γ-ray bursts above 50 GeV. The HAWC observatory will consist of an array of 300 water Cherenkov detectors (WCDs), each with four photomultiplier tubes. This array is currently under construction on the flanks of the Sierra Negra volcano near the city of Puebla, Mexico. The first 30 WCDs (forming an array approximately the size of Milagro) were deployed in Summer 2012, and 100 WCDs will be taking data by May, 2013. We present in this paper the motivation for constructing the HAWC observatory, the status of the deployment, and the first results from the constantly growing array. 相似文献
679.
Angle J Aprile E Arneodo F Baudis L Bernstein A Bolozdynya AI Coelho LC Dahl CE DeViveiros L Ferella AD Fernandes LM Fiorucci S Gaitskell RJ Giboni KL Gomez R Hasty R Kastens L Kwong J Lopes JA Madden N Manalaysay A Manzur A McKinsey DN Monzani ME Ni K Oberlack U Orboeck J Plante G Santorelli R dos Santos JM Schulte S Shagin P Shutt T Sorensen P Winant C Yamashita M;XENON Collaboration 《Physical review letters》2011,107(5):051301
We report results of a search for light (?10 GeV) particle dark matter with the XENON10 detector. The event trigger was sensitive to a single electron, with the analysis threshold of 5 electrons corresponding to 1.4 keV nuclear recoil energy. Considering spin-independent dark matter-nucleon scattering, we exclude cross sections σ(n)>7×10(-42) cm(2), for a dark matter particle mass m(χ)=7 GeV. We find that our data strongly constrain recent elastic dark matter interpretations of excess low-energy events observed by CoGeNT and CRESST-II, as well as the DAMA annual modulation signal. 相似文献
680.
Inoue T Ishii N Aoki S Doi T Hatsuda T Ikeda Y Murano K Nemura H Sasaki K;HAL QCD Collaboration 《Physical review letters》2011,106(16):162002
The flavor-singlet H dibaryon, which has strangeness -2 and baryon number 2, is studied by the approach recently developed for the baryon-baryon interactions in lattice QCD. The flavor-singlet central potential is derived from the spatial and imaginary-time dependence of the Nambu-Bethe-Salpeter wave function measured in N(f)=3 full QCD simulations with the lattice size of L?2,3,4 fm. The potential is found to be insensitive to the volume, and it leads to a bound H dibaryon with the binding energy of 30-40 MeV for the pseudoscalar meson mass of 673-1015 MeV. 相似文献