To study the atmospheric moisture transport processes from the source to a receiver region, isotopic analysis of rainwater from Port Blair (as source region), the Andaman Islands, Bay of Bengal has ...been carried out. In addition to the island site, rainwater collected at three sites on the Indian mainland (as receiver region) namely Nagpur, Kolkata, and Tezpur has also been isotopically analyzed. We present a daily variation of long-term (2012–2015) record of rain isotope from Port Blair to understand the moisture dynamics on a sub-seasonal timescale. It was observed that the Port Blair rainwater oxygen isotope ratios (δ18O) maintain a temporally dependent correlation with the average rainfall over the Core Monsoon Zone (CMZ) of India, though the seasonal rainfall over these two regions appears to be mutually independent. Rain isotopes are controlled more by the moisture dynamics rather than the individual rainfall events. Consequently, the correlation between rainfall over the CMZ and δ18O of Port Blair rain provides conclusive evidence of the transport of the Bay of Bengal (BoB) moisture to the central and the northeast Indian regions during the summer monsoon season. The spatial dependency of Port Blair rain-isotopes with the CMZ rain shows interannual variability and also indicates different pathways of the BoB moisture to the Indian mainland within a given season. The pathways of the source moisture to the receiver are identified by the trajectory analysis with Port Blair being the source area. We observed analogous variation in δ18O of island rain and that of the mainland rain, and δ18O at these two regions is modulated by the monsoon intra-seasonal oscillation (MISO). The correlation between the two isotopic records appears to arise from the propagation of the rain/cloud band from the Bay to the Indian landmass and the associated moisture transport linked to the MISO. Keywords: Monsoon, Rain isotope, Bay of Bengal, Moisture transport
We present various properties of the production of the X(3872) and ψ(2S) states based on 10.4 fb−1 collected by the D0 experiment in Tevatron pp collisions at √s = 1.96 TeV. For both states, we ...measure the nonprompt fraction fNP of the inclusive production rate due to decays of b-flavored hadrons. We find the fNP values systematically below those obtained at the LHC. The fNP fraction for ψ(2S) increases with transverse momentum, whereas for the X(3872) it is constant within large uncertainties, in agreement with the LHC results. The ratio of prompt to nonprompt ψ(2S) production, (1 − fNP)=fNP, decreases only slightly going from the Tevatron to the LHC, but for the X(3872), this ratio decreases by a factor of about 3. We test the soft-pion signature of the X(3872) modeled as a weakly bound charm-meson pair by studying the production of the X(3872) as a function of the kinetic energy of the X(3872) and the pion in the X(3872)π center-of-mass frame. For a subsample consistent with prompt production, the results are incompatible with a strong enhancement in the production of the X(3872) at the small kinetic energy of the X(3872) and the π in the X(3872)π center-of-mass frame expected for the X þ soft-pion production mechanism. For events consistent with being due to decays of b hadrons, there is no significant evidence for the soft-pion effect, but its presence at the level expected for the binding energy of 0.17 MeV and the momentum scale Λ ¼ M(π) is not ruled out.
The D0 Silicon Microstrip Tracker Ahmed, S.N.; Aoki, M.; Åsman, B. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2011, Letnik:
634, Številka:
1
Journal Article
Recenzirano
Odprti dostop
This paper describes the mechanical design, the readout chain, the production, testing and the installation of the Silicon Microstrip Tracker of the D0 experiment at the Fermilab Tevatron collider. ...In addition, we describe the performance and operational experience of the detector during the experiment data collection between 2001 and 2010.
It is shown that if the sneutrino is the second lightest SUSY particle, then the decay products of squarks and gluinos produced at the TEVATRON collider tend to have i) more leptons, ii) smaller ...number of jets and iii) two or more carriers of
▪. This may relax the existing limits on the squark and gluino masses. This effect is likely to be even more striking as these limits improve with accumulation of data. Numerical results for signal cross sections are presented and compared with the ones obtained without a light sneutrino. The possibilities of accommodating this scenario in models motivated by
N = 1 SUGRA are discussed.
The muon system of the Run II DØdetector Abazov, V.M.; Alexeev, G.D.; Alkhazov, G. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2005, Letnik:
552, Številka:
3
Journal Article
We report on a search for second generation leptoquarks (LQ) produced in povr p collisions at radical (s) =1.8 TeV using the D0 detector at Fermilab. Second generation leptoquarks are assumed to be ...produced in pairs and to decay to either mu or nu and either a strange or a charm quark (q) . Limits are placed on sigma(povr pr arrow LQovr LQr arrowmunu+jets) as a function of the mass of the leptoquark. For equal branching ratios to muq and nuq , second generation scalar leptoquarks with a mass below 160 GeV/csup 2 , vector leptoquarks with anomalous minimal vector couplings with a mass below 240 GeV/csup 2 , and vector leptoquarks with Yang-Mills couplings with a mass below 290 GeV/csup 2 , are excluded at the 95percent confidence level. copyright ital 1999 ital The American Physical Society
Scintillation counters for the DØ muon upgrade Acharya, B.S.; Baldin, B.; Banerjee, S. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/1997, Letnik:
401, Številka:
1
Journal Article
Recenzirano
Odprti dostop
We present the results of an upgrade to the DØ muon system. Scintillating counters have been added to the existing central DØ muon system to provide rejection for cosmic-ray muons and out-of-time ...background, and to provide additional fast-timing information for muons in an upgraded Tevatron. Performance and results from the 1994–1996 Tevatron run are presented.
We present a study of sensitivity of the R-parity violating SUSY searches
with the upgraded D0 detector in Run II of the Fermilab Tevatron, within a
SUGRA framework. We considered the lightest ...neutralino as an LSP that decays
into a lepton and slepton (R-parity violating decay), resulting in 2e + \ge 4
jets or 2\mu + \ge 4 jets final state. The analysis, based on scaling of the
Run I results, shows that squarks and gluinos with masses up to about 0.6 TeV
could be probed with 2 fb^-1 of Run II data. This work has been done in the
context of the BTMSSM Working Group of the Run II SUSY/Higgs Workshop at
Fermilab.
We present a study of sensitivity of the R-parity violating SUSY searches with the upgraded D0 detector in Run II of the Fermilab Tevatron, within a SUGRA framework. We considered the lightest ...neutralino as an LSP that decays into a lepton and slepton (R-parity violating decay), resulting in 2e + \ge 4 jets or 2\mu + \ge 4 jets final state. The analysis, based on scaling of the Run I results, shows that squarks and gluinos with masses up to about 0.6 TeV could be probed with 2 fb^-1 of Run II data. This work has been done in the context of the BTMSSM Working Group of the Run II SUSY/Higgs Workshop at Fermilab.
We present an outlook for possible discovery of supersymmetry with broken
R-parity at Run II of the Tevatron. We first present a review of the literature
and an update of the experimental bounds. In ...turn we then discuss the following
processes: 1. Resonant slepton production followed by R-parity violating decay,
(a) via $LQD^c$ and (b) via $LLE^c$. 2. How to distinguish resonant slepton
production from $Z'$ or $W'$ production. 3. Resonant slepton production
followed by the decay to neutralino LSP, which decays via $LQD^c$. 4. Resonant
stop production followed by the decay to a chargino, which cascades to the
neutralino LSP. 5. Gluino pair production followed by the cascade decay to
charm squarks which decay directly via $L_1Q_2D^c_1$. 6. Squark pair production
followed by the cascade decay to the neutralino LSP which decays via
$L_1Q_2D^c_1$. 7. MSSM pair production followed by the cascade decay to the LSP
which decays (a) via $LLE^c$, (b) via $LQD^c$, and (c) via $U^cD^cD^c$,
respectively. 8. Top quark and top squark decays in spontaneous R-parity
violation.
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