Search for a massive invisible particle X0 in B+ ?e+X0 and B+ ??+X0 decays

Park C.-S.; Kwon Y.-J.; Adachi I.; Aihara H.; Asner D.M.; Aushev T.; Babu V.; Badhrees I.; Bakich A.M.; Barberio E.; Behera P.; Bhardwaj V.; Biswal J.; Bonvicini G.; Bozek A.; Bra?ko M.; Browder T.E.; ?ervenkov D.; Chekelian V.; Chen A.; Cheon B.G.; Chilikin K.; Chistov R.; Cho K.; Chobanova V.; Choi Y.; Cinabro D.; Dalseno J.; Danilov M.; Dash N.; Dole�al Z.; Dutta D.; Eidelman S.; Farhat H.; Fast J.E.; Ferber T.; Fulsom B.G.; Gaur V.; Gabyshev N.; Garmash A.; Gillard R.; Goh Y.M.; Goldenzweig P.; Grzymkowska O.; Hara T.; Hayasaka K.; Hayashii H.; Heck M.; Hou W.-S.; Iijima T.; Inami K.; Inguglia G.; Ishikawa A.; Itoh R.; Iwasaki Y.; Jaegle I.; Jeon H.B.; Julius T.; Kang K.H.; Kato E.; Katrenko P.; Kim D.Y.; Kim J.B.; Kim K.T.; Kim M.J.; Kim S.H.; Kinoshita K.; Kody� P.; Korpar S.; Kri�an P.; Krokovny P.; Kuzmin A.; Lee I.S.; Li C.H.; Li L.; Li Y.; Li Gioi L.; Libby J.; Liventsev D.; Lubej M.; Lukin P.; Masuda M.; Matvienko D.; Miyabayashi K.; Miyata H.; Mizuk R.; Mohanty G.B.; Mohanty S.; Moll A.; Moon H.K.; Mussa R.; Nakano E.; Nakao M.; Nath K.J.; Nayak M.; Negishi K.; Nisar N.K.; Nishida S.; Ogawa S.; Okuno S.; Pakhlov P.; Pakhlova G.; Pal B.; Park C.W.; Park H.; Pedlar T.K.; Petri? M.; Piilonen L.E.; Pulvermacher C.; Purohit M.V.; Rauch J.; Ritter M.; Rostomyan A.; Ryu S.; Sakai Y.; Sandilya S.; Santelj L.; Sanuki T.; Sato Y.; Schl�ter T.; Schneider O.; Schnell G.; Schwanda C.; Schwartz A.J.; Seino Y.; Semmler D.; Senyo K.; Seon O.; Sevior M.E.; Shebalin V.; Shen C.P.; Shibata T.-A.; Shiu J.-G.; Shwartz B.; Simon F.; Sokolov A.; Stani? S.; Stari? M.; Stypula J.; Sumiyoshi T.; Tamponi U.; Teramoto Y.; Trabelsi K.; Uchida M.; Uglov T.; Unno Y.; Uno S.; Urquijo P.; Usov Y.; Van Hulse C.; Vanhoefer P.; Varner G.; Varvell K.E.; Wagner M.N.; Wang C.H.; Wang M.-Z.; Wang P.; Watanabe Y.; Won E.; Yamaoka J.; Yashchenko S.; Ye H.; Yook Y.; Yusa Y.; Zhang Z.P.; Zhilich V.; Zhulanov V.; Zupanc A.; Belle Collaboration

Search for a massive invisible particle X0 in B+ ?e+X0 and B+ ??+X0 decays

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2016

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We present a search for a non-Standard-Model invisible particle X0 in the mass range 0.1-1.8 GeV/c2 in B+?e+X0 and B+??+X0 decays. The results are obtained from a 711 fb-1 data sample that corresponds to 772�106BB pairs, collected at the ?(4S) resonance with the Belle detector at the KEKB e+e- collider. One B meson is fully reconstructed in a hadronic mode to determine the momentum of the lepton of the signal decay in the rest frame of the recoiling partner B meson. We find no evidence of a signal and set upper limits on the order of 10-6. � 2016 American Physical Society.

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4

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http://dx.doi.org/10.1103/PhysRevD.94.012003
https://idr.iitbbs.ac.in/handle/2008/997

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Search for a massive invisible particle X0 in B+ ?e+X0 and B+ ??+X0 decays

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