# Direct Measurement of the W Production Charge Asymmetry in pp̅ Collisions at √s=1.96  TeV

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http://hdl.handle.net/10138/24395

#### Citation

Aaltonen , T , Mehtala , P , Orava , R , Mäki , T , Saarikko , H , Osterberg , K & CDF Collaboration 2009 , ' Direct Measurement of the W Production Charge Asymmetry in pp̅ Collisions at √s=1.96  TeV ' , Physical Review Letters , vol. 102 , no. 18 , pp. 181801 . https://doi.org/10.1103/PhysRevLett.102.181801

 Title: Direct Measurement of the W Production Charge Asymmetry in pp̅ Collisions at √s=1.96  TeV Alternative title: Direct Measurement of the $W$ Production Charge Asymmetry in $\ppbar$ Collisions at $\sqrt{s} = 1.96$ TeV Author: Aaltonen, T.; Mehtala, P.; Orava, R.; Mäki, T.; Saarikko, H.; Osterberg, K.; CDF Collaboration Contributor organization: Helsinki Institute of PhysicsParticle Physics and AstrophysicsDepartment of Physics Date: 2009-05-08 Language: eng Number of pages: 7 Belongs to series: Physical Review Letters ISSN: 0031-9007 DOI: https://doi.org/10.1103/PhysRevLett.102.181801 URI: http://hdl.handle.net/10138/24395 Abstract: We present the first direct measurement of the $W$ production charge asymmetry as a function of the $W$ boson rapidity $\yW$ in $\ppbar$ collisions at $\sqrt{s} = 1.96$ $\TeV$. We use a sample of $\wenu$ events in data from 1 $\ifb$ of integrated luminosity collected using the CDF II detector. In the region \$|\yW|We present the first direct measurement of the W production charge asymmetry as a function of the W boson rapidity yW in pp̅ collisions at √s=1.96  TeV. We use a sample of W→eν events in data from 1  fb-1 of integrated luminosity collected using the CDF II detector. In the region |yW|<3.0, this measurement is capable of constraining the ratio of up- and down-quark momentum distributions in the proton more directly than in previous measurements of the asymmetry that are functions of the charged-lepton pseudorapidity. Description: Accepted to Phys. Rev. Lett Subject: 114 Physical sciences hep-ex Peer reviewed: Yes Usage restriction: restrictedAccess Self-archived version: submittedVersion
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