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Free, publicly-accessible full text available October 1, 2027
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The Fermilab E906/SeaQuest collaboration performed measurements of the Drell-Yan process using 120 GeV proton beams bombarding liquid hydrogen and liquid deuterium targets. A combined analysis of all collected data was performed to obtain the final results for the Drell-Yan cross section ratio covering the kinematic region of . The dependencies of and are extracted from these cross section ratios. It is found that is greater than over the entire measured range, with improved statistical accuracy compared to previous measurements. The new results on and are compared to various parton distribution functions and theoretical calculations.more » « lessFree, publicly-accessible full text available April 1, 2027
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Abstract All experiments observing dilepton pairs (e.g.e+e-, μ+μ-) must confront the existence of acombinatoricbackground caused by the combining of tracks not arising from the same physics vertex. Some method must be devised to calculate and remove this background. In this document we describe a particular event-mixing method relying on many of the unique aspects of the SeaQuest spectrometer and data. The method described here calculates the combinatoric background with correct normalization; i.e., there is no need to assign a floating normalization factor that is then determined in a subsequent fitting procedure. Numerous tests are applied to demonstrate the reliability of the method.more » « less
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