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Wang, SM; Ward, B; Waschke, S; Watanabe, T; Waters, D; Watts, T; Weber, M; Wenzel, H; Wester, WC; Whitehouse, B; Wicklund, AB; Wicklund, E; Wilkes, T; Williams, HH; Wilson, P; Winer, BL; Winn, D; Wolbers, S; Wolinski, D; Wolinski, J; Wolinski, S; Wolter, M; Worm, S; Wu, X; Wurthwein, F; Wyss, J; Yang, UK; Yao, W; Yeh, GP; Yeh, P; Yi, K; Yoh, J; Yosef, C; Yoshida, T; Yu, I; Yu, S; Yu, Z; Yun, JC; Zanello, L; Zanetti, A; Zetti, F; Zucchelli, S; CDF Collaboration; - view fewer (2003) Central pseudorapidity gaps in events with a leading antiproton at the Fermilab tevatron (p)over-barp collider. PHYS REV LETT , 91 (1) , Article 011802. 10.1103/PhysRevLett.91.011802.

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Abstract

We report a measurement of the fraction of events with a large pseudorapidity gap Deltaeta within the pseudorapidity region available to the proton dissociation products X in (p) over bar +p-->(p) over bar +X. For a final state (p) over bar of fractional momentum loss xi((p) over bar) and 4-momentum transfer squared t((p) over bar) within 0.06<xi(p $$($) over bar)<0.09 and \t((p) over bar)\<1.0 [0.2] GeV2 at roots=1800 [630] GeV, the fraction of events with Deltaeta>3 is found to be 0.246+/-0.001 (stat)+/-0.042 (syst) [0.184+/-0.001 (stat)+/-0.043 (syst)]. Our results are compared with gap fractions measured in minimum bias (p) over barp collisions and with theoretical expectations.

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