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We have studied the photometric properties of four fields around thehigh-redshift quasar pairs QP1310+0007, QP1355-0032, QP0110-0219, andQP0114-3140 at z ~ 1 with the aim of identifying large-scale structures- galaxyclusters or groups- around them. This sample was observed with GMOS in GeminiNorth and South telescopes in the g', r', i', and z' bands, and our photometryis complete to a limiting magnitude of i' ~ 24 mag (corresponding to ~ M*_i' +2 at the redshift of the pairs). Our analysis reveals that QP0110-0219 showsvery strong and QP1310+0007 and QP1355-0032 show some evidence for the presenceof rich galaxy clusters in direct vicinity of the pairs. On the other hand,QP0114-3140 could be an isolated pair in a poor environment. This work suggestthat z ~ 1 quasar pairs are excellent tracers of high density environments andthis same technique may be useful to find clusters at higher redshifts.Comment: 29 pages, 7 figures, ApJ accepted. Added one figure and 3 references.  Some paragraphs was rewritten in sections 1, 3, 5, and 6, as suggested by  refere

Searching High‐Redshift Large‐Scale Structures: Photometry of Four Fields around Quasar Pairs atz∼ 1