Measurement of the Branching Fractions B(B^{0}→pp[over ¯]pp[over ¯]) and B(B_{s}^{0}→pp[over ¯]pp[over ¯]).
R Aaij, A S W Abdelmotteleb, C Abellan Beteta, F Abudinén, T Ackernley, B Adeva, M Adinolfi, P Adlarson, H Afsharnia, C Agapopoulou, C A Aidala, Z Ajaltouni, S Akar, K Akiba, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, Z Aliouche, P Alvarez Cartelle, R Amalric, S Amato, J L Amey, Y Amhis, L An, L Anderlini, M Andersson, A Andreianov, M Andreotti, D Andreou, D Ao, F Archilli, A Artamonov, M Artuso, E Aslanides, M Atzeni, B Audurier, S Bachmann, M Bachmayer, J J Back, A Bailly-Reyre, P Baladron Rodriguez, V Balagura, W Baldini, J Baptista de Souza Leite, M Barbetti, R J Barlow, S Barsuk, W Barter, M Bartolini, F Baryshnikov, J M Basels, G Bassi, B Batsukh, A Battig, A Bay, A Beck, M Becker, F Bedeschi, I B Bediaga, A Beiter, V Belavin, S Belin, V Bellee, K Belous, I Belov, I Belyaev, G Benane, G Bencivenni, E Ben-Haim, A Berezhnoy, R Bernet, S Bernet Andres, D Berninghoff, H C Bernstein, C Bertella, A Bertolin, C Betancourt, F Betti, Ia Bezshyiko, S Bhasin, J Bhom, L Bian, M S 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Semennikov, M Senghi Soares, A Sergi, N Serra, L Sestini, A Seuthe, Y Shang, D M Shangase, M Shapkin, I Shchemerov, L Shchutska, T Shears, L Shekhtman, Z Shen, S Sheng, V Shevchenko, B Shi, E B Shields, Y Shimizu, E Shmanin, R Shorkin, J D Shupperd, B G Siddi, R Silva Coutinho, G Simi, S Simone, M Singla, N Skidmore, R Skuza, T Skwarnicki, M W Slater, J C Smallwood, J G Smeaton, E Smith, K Smith, M Smith, A Snoch, L Soares Lavra, M D Sokoloff, F J P Soler, A Solomin, A Solovev, I Solovyev, R Song, F L Souza De Almeida, B Souza De Paula, B Spaan, E Spadaro Norella, E Spedicato, E Spiridenkov, P Spradlin, V Sriskaran, F Stagni, M Stahl, S Stahl, S Stanislaus, E N Stein, O Steinkamp, O Stenyakin, H Stevens, S Stone, D Strekalina, Y Su, F Suljik, J Sun, L Sun, Y Sun, P Svihra, P N Swallow, K Swientek, A Szabelski, T Szumlak, M Szymanski, Y Tan, S Taneja, M D Tat, A Terentev, F Teubert, E Thomas, D J D Thompson, K A Thomson, H Tilquin, V Tisserand, S T'Jampens, M Tobin, L Tomassetti, G Tonani, X Tong, D Torres Machado, D Y Tou, S M Trilov, C Trippl, G Tuci, A Tully, N Tuning, A Ukleja, D J Unverzagt, A Usachov, A Ustyuzhanin, U Uwer, A Vagner, V Vagnoni, A Valassi, G Valenti, N Valls Canudas, M van Beuzekom, M Van Dijk, H Van Hecke, E van Herwijnen, C B Van Hulse, M van Veghel, R Vazquez Gomez, P Vazquez Regueiro, C Vázquez Sierra, S Vecchi, J J Velthuis, M Veltri, A Venkateswaran, M Veronesi, M Vesterinen, D Vieira, M Vieites Diaz, X Vilasis-Cardona, E Vilella Figueras, A Villa, P Vincent, F C Volle, D Vom Bruch, A Vorobyev, V Vorobyev, N Voropaev, K Vos, C Vrahas, R Waldi, J Walsh, G Wan, C Wang, G Wang, J Wang, J Wang, J Wang, J Wang, M Wang, R Wang, X Wang, Y Wang, Z Wang, Z Wang, Z Wang, J A Ward, N K Watson, D Websdale, Y Wei, C Weisser, B D C Westhenry, D J White, M Whitehead, A R Wiederhold, D Wiedner, G Wilkinson, M K Wilkinson, I Williams, M Williams, M R J Williams, R Williams, F F Wilson, W Wislicki, M Witek, L Witola, C P Wong, G Wormser, S A Wotton, H Wu, J Wu, K Wyllie, Z Xiang, D Xiao, Y Xie, A Xu, J Xu, L Xu, L Xu, M Xu, Q Xu, Z Xu, Z Xu, D Yang, S Yang, X Yang, Y Yang, Z Yang, Z Yang, L E Yeomans, V Yeroshenko, H Yeung, H Yin, J Yu, X Yuan, E Zaffaroni, M Zavertyaev, M Zdybal, O Zenaiev, M Zeng, C Zhang, D Zhang, L Zhang, S Zhang, S Zhang, Y Zhang, Y Zhang, H Zhao, A Zharkova, A Zhelezov, Y Zheng, T Zhou, X Zhou, Y Zhou, V Zhovkovska, X Zhu, X Zhu, Z Zhu, V Zhukov, Q Zou, S Zucchelli, D Zuliani, G ZunicaSearches for the rare hadronic decays B^{0}→pp[over ¯]pp[over ¯] and B_{s}^{0}→pp[over ¯]pp[over ¯] are performed using proton-proton collision data recorded by the LHCb experiment and corresponding to an integrated luminosity of 9 fb^{-1}. Significances of 9.3σ and 4.0σ, including statistical and systematic uncertainties, are obtained for the B^{0}→pp[over ¯]pp[over ¯] and B_{s}^{0}→pp[over ¯]pp[over ¯] signals, respectively. The branching fractions are measured relative to the topologically similar normalization decays B^{0}→J/ψ(→pp[over ¯])K^{*0}(→K^{+}π^{-}) and B_{s}^{0}→J/ψ(→pp[over ¯])ϕ(→K^{+}K^{-}). The branching fractions are measured to be B(B^{0}→pp[over ¯]pp[over ¯])=(2.2±0.4±0.1±0.1)×10^{-8} and B(B_{s}^{0}→pp[over ¯]pp[over ¯])=(2.3±1.0±0.2±0.1)×10^{-8}. In these measurements, the first uncertainty is statistical, the second is systematic, and the third one is due to the external branching fraction of the normalization channel.
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