2,715 research outputs found
Deci-weak at Tevatron and LHC
Recently Tevatron released their measurements on invariant mass spectrum of
electron/positron, as well as the di-jet arising from WW+WZ production with one
W leptonically decay. Though the statistics is not significant, there are two
bumps around 240 GeV and 120-160 GeV respectively. We proposed that the two
bumps correspond to the extra light gauge bosons and ,
which couple with quarks with the deci-weak strength. In this brief report, we
also simulated di-jet invariant mass distribution at the current running LHC.Comment: 8 pages, 3 EPS figures, ref added, figures update
New Color-Octet Vector Boson Revisit
Motivated by CDF recent measurements on di-jet invariant mass spectrum where
di-jet is associated production with charged leptons () and missing
energy, we re-examine the previous proposed massive color-octet
axial-vector-like boson . Our simulation showed that the di-jet bump
around 120-160 GeV can be induced by with effective coupling (q represents the quark other than top and is the
strong coupling constant). Moreover our numerical investigation indicated that
the top quark forward-backward asymmetry can be reproduced without
distorting shape of differential cross section ,
provided that the and top quark coupling is appropriately chosen (). Our results also showed that the
theoretical as functions of and can be
consistent with data within and respectively.Comment: 8 pages, 3 EPS figure
Time and spatial distribution of multidrug-resistant tuberculosis among Chinese people, 1981–2006: a systematic review
SummaryObjectivesWe aimed to investigate trends in the prevalence of multidrug-resistant tuberculosis (MDR-TB) among Chinese people from first report to 2006, and to detect the high prevalence regions in order to guide control efforts.Materials and methodsThe CBM, VIP, CNKI, and MEDLINE databases were searched through both keywords and subject headings. The literature was screened, and two investigators assessed the quality and extracted the data. Trends in MDR-TB prevalence in three groups – primary, acquired, and combined MDR-TB – were examined separately, using the Cochran–Armitage trend test. Differences were tested with the Kruskal–Wallis test. High prevalence provinces were explored through comparison of the 95% confidence interval (95% CI) with the national average level.ResultsOverall 169 studies were included, with 165 in Chinese and four in English. One hundred and sixteen studies concerned primary MDR-TB, 103 acquired MDR-TB, and 130 combined MDR-TB, with total positive Mycobacterium tuberculosis (MTB) isolates of 110 076, 25 187, and 150 233, respectively. The prevalences of MDR-TB in the three groups in 2005 were 2.64-, 6.20-, and 3.84-times that of 1985, respectively, all showing an upward trend (p<0.05). The prevalences among the three groups were significantly different (p<0.05), with acquired drug resistance (27.5%, 95% CI 26.9–28.1%) much higher than primary drug resistance (4.3%, 95% CI 4.2–4.4%), and combined resistance (9.9%, 95% CI 9.8–10.1%) in between. The top three prevalence regions for primary, acquired, and combined MDR-TB were distributed in the zone from the northeast to the southwest of China, with Hebei, Tibet, and Shanxi having an extremely high prevalence.ConclusionsThe prevalence of MDR-TB among the Chinese people has shown an upward trend since 1985. It is necessary to continue to monitor this trend in China. Special attention should be paid to provinces distributed in the zone from the northeast to the southwest of China for MDR-TB surveillance, research, and control
Implementation of Grover search algorithm with Josephson charge qubits
A scheme of implementing the Grover search algorithm based on Josephson
charge qubits has been proposed, which would be a key step to scale more
complex quantum algorithms and very important for constructing a real quantum
computer via Josephson charge qubits. The present scheme is simple but fairly
efficient, and easily manipulated because any two-charge-qubit can be
selectively and effectively coupled by a common inductance. More manipulations
can be carried out before decoherence sets in. Our scheme can be realized
within the current technology.Comment: 4 pages, 4 figure
Suppressing Decoherence in Quantum Plasmonic Systems by Spectral Hole Burning Effect
Quantum plasmonic systems suffer from significant decoherence due to the
intrinsically large dissipative and radiative dampings. Based on our quantum
simulations via a quantum tensor network algorithm, we numerically demonstrate
the mitigation of this restrictive drawback by hybridizing a plasmonic
nanocavity with an emitter ensemble with inhomogeneously-broadened transition
frequencies. By burning two narrow spectral holes in the spectral density of
the emitter ensemble, the coherent time of Rabi oscillation for the hybrid
system is increased tenfold. With the suppressed decoherence, we move one step
further in bringing plasmonic systems into practical quantum applications
- …