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25,827 Matching Results

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Best Match Title Creator Date Created (Newest) Date Created (Oldest) Date Added (Newest) Date Added (Oldest)
A proper time dependent measurement of Delta M {sub D} using jet charge and soft lepton flavor tagging (open access)

A proper time dependent measurement of Delta M {sub D} using jet charge and soft lepton flavor tagging

This thesis presents a proper time dependent measurement of the B{sup 0}{sub d} mixing frequency {Delta}M{sub d} using jet charge and soft lepton flavor tagging in p - {anti p} collisions at {radical}s = 1.8 TeV. The measurement uses the inclusive e and {mu} trigger data of the CDF detector from an integrated luminosity of 91 pb{sub -1}. The proper time at decay is measured from a partial reconstruction of the B associated with the trigger lepton. The measurement of {Delta}M{sub d} yields {Delta}M{sub d} = 0.50 {+-} 0.05 {+-} 0.05 {bar h} ps{sup -1} where the first error is statistical and the second systematic. The flavor tagging methods used give a measured effective efficiency {epsilon}D{sup 2} of o Jet Charge: {epsilon}D{sup 2} (0.78 + 0.12 + 0.09) % o Soft Lepton: {epsilon}D{sup 2} (1.07 + 0.09 + 0.10) % where the first error is statistical and the second systematic.
Date: August 1, 1998
Creator: unknown
System: The UNT Digital Library
[Request to Leave Laredo from Maria Josefa] (open access)

[Request to Leave Laredo from Maria Josefa]

Request to leave Laredo from Maria Josefa to José Ramón Díaz de Bustamente. The document is heavily stained and has frayed edges along the top right corner.
Date: 1810?
Creator: unknown
System: The Portal to Texas History
Temperature dependence of CsI(Tl) gamma-ray excited scintillation characteristics (open access)

Temperature dependence of CsI(Tl) gamma-ray excited scintillation characteristics

Gamma-ray excited emission spectrum, absolute scintillation yield, rise and decay time constants, and thermoluminescence emissions of CsI(Tl) were measured at {minus}100 to +50 C, for crystals from 4 different vendors. The thermoluminescence glow curves were the only property that varied significantly from crystal to crystal; room temperature operation in current mode could be susceptible to temperature fluctuations. The CsI(Tl) emission spectrum has emission bands peaking around 400 and 560 nm; the former band disappears between {minus}50 and {minus}75 C. The RT absolute scintillation yield was calculated to be 65,500{plus_minus}4,100 photons/MeV. The two primary decay time constants increases about exponentially with inverse temperature. An ultra-fast decay component was confirmed. Applications are discussed.
Date: October 1, 1993
Creator: unknown
System: The UNT Digital Library