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A search for the decay K-s(0) -> mu(+)mu(-) is performed, based on a data sample of 1.0fb(-1) of pp collisions at root s = 7 TeV collected by the LHCb experiment at the Large Hadron Collider. The observed number of candidates is consistent with the background-only hypothesis, yielding an upper limit of B(K-S(0) -> mu(+)mu(-)) < 11(9) x 10(-9) at 95 (90)% confidence level. This limit is a factor of thirty below the previous measurement.
Olivier Schneider, Aurelio Bay, Guido Haefeli, Tatsuya Nakada, Frédéric Blanc, Lesya Shchutska, Elena Graverini, Donal Patrick Hill, Marie Theres Christin Bachmayer, Sebastian Schulte, Aravindhan Venkateswaran, Veronica Sølund Kirsebom, Renato Quagliani, Yunxuan Song, Luis Miguel Garcia Martin, Vitalii Lisovskyi, Surapat Ek-In, Sonia Amina Bouchiba, Serhii Cholak, Federico Ronchetti, Sara Celani, Anni Matilda Kauniskangas, Raphaël van Laak, Ettore Zaffaroni, Elisabeth Maria Niel, Radoslav Marchevski, Dimitrios Kaminaris, Maria Carolina Feliciano Faria, Louis André Marie Jean Henry