Observation of the decay B⁰_s to φπ^+π^- and evidence for B⁰ to φπ^+π^-

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Lebedev Physical Institute Russian Academy of Science (LPI RAS) (d) Universit\`a di Bari (e) Universit\`a di Bologna (f) Universit\`a di Cagliari (g) Universit\`a di Ferrara (h) Universit\`a di Genova (i) Universit\`a di Milano Bicocca (j) Universit\`a di Roma Tor Vergata (k) Universit\`a di Roma La Sapienza (l) AGH - University of Science Faculty of Computer Science Electronics Telecommunications (m) LIFAELS La Salle Universitat Ramon Llull (n) Hanoi University of Science Hanoi Viet Nam (o) Universit\`a di Padova (p) Universit\`a di Pisa (q) Universit\`a degli Studi di Milano (r) Universit\`a di Urbino Urbino (s) Universit\`a della Basilicata Potenza (t) Scuola Normale Superiore (u) Universit\`a di Modena e Reggio Emilia Modena (v) Iligan Institute of Technology (IIT) Iligan Philippines (w) Novosibirsk State University (X) deceased)