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M.-H.Schwemmer R.Sciascia B.Sciubba A.Seco M.Semennikov A.Sepp I.Serra N.Serrano J.Sestini L.Seyfert P.Shapkin M.Shapoval I.Shcheglov Y.Shears T.Shekhtman L.Shevchenko V.Shires A.Silva Coutinho R.Simi G.Sirendi M.Skidmore N.Skwarnicki T.Smith N.A.Smith E.Smith E.Smith J.Smith M.Snoek H.Sokoloff M.D.Soler F.J.P.Soomro F.Souza D.De Paula B.S.Spaan B.Sparkes A.Spradlin P.Sridharan S.Stagni F.Stahl M.Stahl S.Steinkamp O.Stenyakin O.Stevenson S.Stoica S.Stone S.Storaci B.Stracka S.Straticiuc M.Straumann U.Stroili R.Subbiah V.K.Sun L.Sutcliffe W.Swientek K.Swientek S.Syropoulos V.Szczekowski M.Szczypka P.Szilard D.Szumlak T.T’Jampens S.Teklishyn M.Tellarini G.Teubert F.Thomas C.Thomas E.van Tilburg J.Tisserand V.Tobin M.Tolk S.Tomassetti L.Tonelli D.Topp-Joergensen S.Torr N.Tournefier E.Tourneur S.Tran M.T.Tresch M.Tsaregorodtsev A.Tsopelas P.Tuning N.Ubeda Garcia M.Ukleja A.Ustyuzhanin A.Uwer U.Vacca C.Vagnoni V.Valenti G.Vallier A.Vazquez Gomez R.Vazquez Regueiro P.Vázquez Sierra C.Vecchi S.Velthuis J.J.Veltri M.Veneziano G.Vesterinen M.Viaud B.Vieira D.Vieites Diaz M.Vilasis-Cardona X.Vollhardt A.Volyanskyy D.Voong D.Vorobyev A.Vorobyev V.Voß C.Voss H.de Vries J.A.Waldi R.Wallace C.Wallace R.Walsh J.Wandernoth S.Wang J.Ward D.R.Watson N.K.Websdale D.Whitehead M.Wicht J.Wiedner D.Wilkinson G.Williams M.P.Williams M.Wilschut H.W.Wilson F.F.Wimberley J.Wishahi J.Wislicki W.Witek M.Wormser G.Wotton S.A.Wright S.Wyllie K.Xie Y.Xing Z.Xu Z.Yang Z.Yuan X.Yushchenko O.Zangoli M.Zavertyaev M.Zhang L.Zhang W.C.Zhang Y.Zhelezov A.Zhokhov A.Zhong L.Zvyagin A.2024-07-222024-07-22201514346044http://akademikarsiv.cbu.edu.tr:4000/handle/123456789/16202The production of the ηc(1S) state in proton-proton collisions is probed via its decay to the pp final state with the LHCb detector, in the rapidity range 2.0 < y < 4.5 and in the meson transverse-momentum range pT > 6.5 GeV/c. The cross-section for prompt production of ηc;(1S) mesons relative to the prompt J/ψ cross-section is measured, for the first time, to be σηc(1S)/σJ/ψ = 1.74±0.29±0.28±0. 18B at a centre-of-mass energy (Formula presented.) using data corresponding to an integrated luminosity of 0.7 fb-1, and σηc(1S)/σJ/ψ = 1.60±0.29±0.25±0.17B at (Formula presented.) using 2.0 fb-1. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the ηc(1S) and J/ψ decays to the pp final state. In addition, the inclusive branching fraction of b-hadron decays into ηc(1S) mesons is measured, for the first time, to be B(b→ηcX)=(4.88±0.64±0.29±0.67B)×10-3, where the third uncertainty includes also the uncertainty on the J/ψ inclusive branching fraction from b-hadron decays. The difference between the J/ψ and ηc(1S) meson masses is determined to be 114.7±1.5±0.1MeV/c2. © 2015, CERN for the benefit of the LHCb collaboration.EnglishAll Open Access; Gold Open AccessArticle10.1140/epjc/s10052-015-3502-x