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Very wide binaries (> 500 AU) are subject to numerous encounters withflying-by stars in the Galactic field and can be perturbated into highlyeccentric orbits (e ~ 0.99). For such systems tidal interactions at closepericenter passages can lead to orbit circularization and possibly masstransfer, consequently producing X-Ray binaries without the need for commonenvelope. We test this scenario for the case of Black Hole Low-Mass X-RayBinaries (BH LMXBs) by performing a population synthesis from primordialbinaries with numerical treatment of random stellar encounters. We test variousmodels for the threshold pericenter distance under which tidal forces causecircularization. We estimate that fly-by interactions can produce a currentpopulation of ~ 60$-$220 BH LMXBs in the Galactic field. The results aresensitive to the assumption on tidal circularization efficiency and zero tovery small BH natal kicks of a few km/s are required. We show that the mostlikely donors are low-mass stars (< 1 Msun; at the onset of mass transfer) asobserved in the population of known sources (~ 20). However, the low number ofsystems formed along this route is in tension with most recent observationalestimate of the number of dormant BH LMXBs in the Galaxy 10$^4-$10$^8$(Tetarenko et al. 2016). If indeed the numbers are so high, alternativeformation channels of BHs with low-mass donors need to be identified.

Dynamical formation of Black Hole Low-Mass X-Ray Binaries in the field - an alternative to common envelope