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Search for the decay $B^+\rightarrow\overline{K}{}^{*0}K^{*+}$ at Belle  [PDF]
Belle Collaboration,Y. M. Goh,Y. Unno,B. G. Cheon,A. Abdesselam,I. Adachi,H. Aihara,S. Al Said,K. Arinstein,V. Aulchenko,T. Aushev,R. Ayad,V. Bansal,E. Barberio,B. Bhuyan,A. Bozek,M. Bra?ko,T. E. Browder,A. Chen,V. Chobanova,D. Cinabro,Z. Dole?al,Z. Drásal,D. Dutta,S. Eidelman,H. Farhat,T. Ferber,V. Gaur,A. Garmash,R. Gillard,B. Golob,J. Haba,T. Hara,H. Hayashii,X. H. He,W. -S. Hou,M. Huschle,T. Iijima,A. Ishikawa,R. Itoh,Y. Iwasaki,I. Jaegle,D. Joffe,T. Julius,K. H. Kang,T. Kawasaki,D. Y. Kim,H. J. Kim,J. B. Kim,J. H. Kim,K. T. Kim,M. J. Kim,S. H. Kim,B. R. Ko,P. Kody?,S. Korpar,P. Kri?an,P. Krokovny,T. Kuhr,Y. -J. Kwon,J. S. Lange,I. S. Lee,Y. Li,L. Li Gioi,J. Libby,D. Liventsev,P. Lukin,K. Matsuoka,D. Matvienko,H. Miyake,H. Miyata,R. Mizuk,G. B. Mohanty,S. Mohanty,A. Moll,H. K. Moon,R. Mussa,E. Nakano,T. Nanut,M. Nayak,N. K. Nisar,S. Nishida,S. Ogawa,S. Okuno,W. Ostrowicz,G. Pakhlova,C. W. Park,H. Park,M. Petri?,L. E. Piilonen,E. Ribe?l,M. Ritter,A. Rostomyan,Y. Sakai,S. Sandilya,T. Sanuki,V. Savinov,O. Schneider,G. Schnell,C. Schwanda,K. Senyo,M. E. Sevior,V. Shebalin,T. -A. Shibata,J. -G. Shiu,B. Shwartz,F. Simon,Y. -S. Sohn,A. Sokolov,E. Solovieva,M. Stari?,M. Sumihama,T. Sumiyoshi,U. Tamponi,G. Tatishvili,Y. Teramoto,V. Trusov,M. Uchida,S. Uno,Y. Usov,C. Van Hulse,P. Vanhoefer,G. Varner,A. Vinokurova,C. H. Wang,M. -Z. Wang,P. Wang,Y. Watanabe,K. M. Williams,E. Won,S. Yashchenko,Y. Yusa,Z. P. Zhang,V. Zhilich
Physics , 2015, DOI: 10.1103/PhysRevD.91.071101
Abstract: We report a search for the rare charmless decay $B^+\rightarrow\overline{K}{}^{*0}K^{*+}$ using a data sample of $772\times10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. No statistically significant signal is found and a 90% confidence-level upper limit is set on the decay branching fraction as $ \mathcal{B}(B^+\rightarrow\overline{K}{}^{*0}K^{*+}) <1.31\times 10^{-6}$.
Search for the proton decay mode $p \rightarrow \overlineν K^{+}$ with KamLAND  [PDF]
KamLAND Collaboration
Physics , 2015, DOI: 10.1103/PhysRevD.92.052006
Abstract: We present a search for the proton decay mode $p \rightarrow \overline{\nu} K^{+}$ based on an exposure of 8.97 kton-years in the KamLAND experiment. The liquid scintillator detector is sensitive to successive signals from $p \rightarrow \overline{\nu} K^{+}$ with unique kinematics, which allow us to achieve a detection efficiency of 44%, higher than previous searches in water Cherenkov detectors. We find no evidence of proton decays for this mode. The expected background, which is dominated by atmospheric neutrinos, is $0.9 \pm 0.2$ events. The nonbackground-subtracted limit on the partial proton lifetime is $\tau / B(p \rightarrow \overline{\nu} K^{+}) > 5.4 \times 10^{32}$ years at 90% C.L.
A lattice calculation of the branching ratio for $\overline{B} \rightarrow K^* γ$  [PDF]
Hugh Shanahan,UKQCD Collaboration
Physics , 1993,
Abstract: Preliminary results are presented on the calculation of the relevant form factor for the radiative decay $\overline{B} \rightarrow K^* \gamma$ We find that the form factor is weakly dependent on the spectator quark mass. We compare the results obtained for a full chiral extrapolation and where this independence is assumed. Both results are found to be statistically consistent with the experimental data.
Observation of the decay $B_s^0\rightarrow K^0\overline{K}^0$  [PDF]
Belle Collaboration,B. Pal,A. J. Schwartz,A. Abdesselam,I. Adachi,H. Aihara,D. M. Asner,T. Aushev,R. Ayad,T. Aziz,V. Babu,I. Badhrees,S. Bahinipati,A. M. Bakich,E. Barberio,P. Behera,V. Bhardwaj,B. Bhuyan,J. Biswal,A. Bobrov,A. Bozek,M. Bra?ko,T. E. Browder,D. ?ervenkov,V. Chekelian,A. Chen,B. G. Cheon,R. Chistov,K. Cho,V. Chobanova,Y. Choi,D. Cinabro,J. Dalseno,N. Dash,Z. Dole?al,Z. Drásal,A. Drutskoy,D. Dutta,S. Eidelman,H. Farhat,J. E. Fast,B. G. Fulsom,V. Gaur,A. Garmash,R. Gillard,Y. M. Goh,P. Goldenzweig,D. Greenwald,O. Grzymkowska,J. Haba,T. Hara,K. Hayasaka,H. Hayashii,X. H. He,W. -S. Hou,K. Inami,A. Ishikawa,Y. Iwasaki,W. W. Jacobs,I. Jaegle,H. B. Jeon,D. Joffe,K. K. Joo,T. Julius,K. H. Kang,E. Kato,T. Kawasaki,C. Kiesling,D. Y. Kim,H. J. Kim,K. T. Kim,M. J. Kim,S. H. Kim,K. Kinoshita,P. Kody?,S. Korpar,P. Kri?an,P. Krokovny,T. Kuhr,R. Kumar,T. Kumita,A. Kuzmin,Y. -J. Kwon,I. S. Lee,C. H. Li,H. Li,L. Li,L. Li Gioi,J. Libby,D. Liventsev,P. Lukin,T. Luo,M. Masuda,D. Matvienko,K. Miyabayashi,H. Miyata,R. Mizuk,G. B. Mohanty,S. Mohanty,A. Moll,H. K. Moon,T. Mori,R. Mussa,E. Nakano,M. Nakao,T. Nanut,Z. Natkaniec,M. Nayak,N. K. Nisar,S. Nishida,S. Ogawa,S. Okuno,P. Pakhlov,G. Pakhlova,C. W. Park,H. Park,S. Paul,T. K. Pedlar,L. Pesántez,R. Pestotnik,M. Petri?,L. E. Piilonen,C. Pulvermacher,J. Rauch,E. Ribe?l,M. Ritter,A. Rostomyan,S. Ryu,H. Sahoo,Y. Sakai,S. Sandilya,T. Sanuki,Y. Sato,V. Savinov,T. Schlüter,O. Schneider,G. Schnell,C. Schwanda,Y. Seino,K. Senyo,O. Seon
Physics , 2015,
Abstract: We measure the decay $B_s^0\rightarrow K^0\overline{K}^0$ using data collected at the $\Upsilon(5S)$ resonance with the Belle detector at the KEKB $e^+e^-$ collider. The data sample used corresponds to an integrated luminosity of 121.4 ${\rm fb^{-1}}$. We measure a branching fraction $\mathcal{B}(B_s^0\rightarrow K^0\overline{K}^0) = [19.6\,^{+5.8}_{-5.1}({\rm stat.})\,\pm1.0({\rm sys.})\,\pm 2.0(N^{}_{B_s^0\overline{B}_s^0})]\times 10^{-6}$ with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.
Search for the decay ${\overline B}^{0}\rightarrow{Λ_{\rm c}^{+}}{\overline p}{p}{\overline p}$  [PDF]
The BABAR Collaboration
Physics , 2013, DOI: 10.1103/PhysRevD.89.071102
Abstract: We report a search for the decay ${\overline B}^{0}\rightarrow{\Lambda_{\rm c}^{+}}{\overline p}{p}{\overline p}$. Using a data sample of $471 \times 10^6\: B{\overline B}$ pairs collected with the BABAR detector at the PEP-II storage ring at SLAC, we find no events and set an upper limit on the branching fraction ${\cal B}({\overline B}^{0}\rightarrow{\Lambda_{\rm c}^{+}}{\overline p}{p}{\overline p}) \times\frac{{\cal B}(\Lambda_{\rm c}^{+}\rightarrow p K^{-} \pi^{+})}{0.050} < 2.8\times10^{-6}$ at $90\,%$ C.L., where we have normalized ${\cal B}(\Lambda_{\rm c}^{+}\rightarrow p K^{-} \pi^{+})$ to the world average value.
Search for $K^-pp$ bound state via $γd \rightarrow K^+ π^-X$ reaction at $E_γ=1.5-2.4$ GeV  [PDF]
A. O. Tokiyasu,M. Niiyama,J. D. Parker,D. S. Ahn,J. K. Ahn,S. Ajimura,H. Akimune,Y. Asano,W. C. Chang,J. Y. Chen,S. Daté,H. Ejiri,H. Fujimura,M. Fujiwara,S. Fukui,S. Hasegawa,K. Hicks,K. Horie,T. Hotta,S. H. Hwang,K. Imai,T. Ishikawa,T. Iwata,Y. Kato,H. Kawai,K. Kino,H. Kohri,Y. Kon,N. Kumagai,D. L. Lin,Y. Maeda,S. Makino,T. Matsuda,T. Matsumura,N. Matsuoka,T. Mibe,M. Miyabe,M. Miyachi,N. Muramatsu,R. Murayama,T. Nakano,Y. Nakatsugawa,M. Nomachi,Y. Ohashi,H. Ohkuma,T. Ohta,T. Ooba,D. S. Oshuev,C. Rangacharyulu,S. Y. Ryu,A. Sakaguchi,T. Sawada,P. M. Shagin,Y. Shiino,H. Shimizu,E. A. Strokovsky,Y. Sugaya,M. Sumihama,J. L. Tang,Y. Toi,H. Toyokawa,T. Tsunemi,M. Uchida,M. Ungaro,A. Wakai,C. W. Wang,S. C. Wang,K. Yonehara,T. Yorita,M. Yoshimura,M. Yosoi,R. G. T. Zegers
Physics , 2013, DOI: 10.1016/j.physletb.2013.12.039
Abstract: A search for $K^-pp$ bound state (the lightest kaonic nucleus) has been performed using the $\gamma d \rightarrow K^+ \pi^- \rm{X}$ reaction at E$_\gamma$=1.5-2.4 GeV at LEPS/SPring-8. The differential cross section of $K^+ \pi^-$ photo-production off deuterium has been measured for the first time in this energy region, and a bump structure was searched for in the inclusive missing mass spectrum. A statistically significant bump structure was not observed in the region from 2.22 to 2.36 GeV/$c^2$, and the upper limits of the differential cross section for the $K^-pp$ bound state production were determined to be 0.1$-$0.7 $\mu$ b (95$%$ confidence level) for a set of assumed binding energy and width values.
Search for the Decay $K^+ \to π^+ ν\overlineν$  [PDF]
S. Adler,M. S. Atiya,I-H. Chiang,J. S. Frank,J. S. Haggerty,T. F. Kycia,K. K. Li,L. S. Littenberg,A. Sambamurti,A. Stevens,R. C. Strand,C. Witzig,W. C. Louis,D. S. Akerib,M. Ardebili,M. R. Convery,M. M. Ito,D. R. Marlow,R. A. McPherson,P. D. Meyers,M. A. Selen,F. C. Shoemaker,A. J. S. Smith,E. W. Blackmore,D. A. Bryman,L. Felawka,P. Kitching,A. Konaka,V. A. Kujala,Y. Kuno,J. A. Macdonald,T. Nakano,T. Numao,P. Padley,J-M. Poutissou,R. Poutissou,J. Roy,R. Soluk,A. S. Turcot
Physics , 1995, DOI: 10.1103/PhysRevLett.76.1421
Abstract: An upper limit on the branching ratio for the decay $K^+ \! \rightarrow \! \pi^+ \nu \overline{\nu}$ is set at $2.4 \times 10^{-9}$ at the 90\% C.L. using pions in the kinematic region $214~{\rm MeV}/c < P_\pi < 231~{\rm MeV}/c$. An upper limit of $5.2 \times 10^{-10}$ is found on the branching ratio for decays $K^+ \! \rightarrow \! \pi^+ X^0$, where $X^0$ is any massless, weakly interacting neutral particle. Limits are also set for cases where $M_{X^0}>0$.
The decays $K \to ππν\overlineν$ within the standard model  [PDF]
L. S. Littenberg,G. Valencia
Physics , 1995, DOI: 10.1016/0370-2693(96)00845-3
Abstract: We study the reactions $K \rightarrow \pi \pi \nu \overline{\nu}$ within the minimal standard model. We use isospin symmetry to relate the matrix elements to the form factors measured in $K_{\ell 4}$. We argue that these modes are short distance dominated and can be used for precise determinations of the CKM parameters $\rho$ and $\eta$. Depending on the value of the CKM angles we find branching ratios in the following ranges: $B(K_L \rightarrow \pi^+ \pi^- \nu \overline{\nu}) = [2-5] \times 10^{-13}$; $B(K_L \rightarrow \pi^0 \pi^0 \nu \overline{\nu}) = [1-3] \times 10^{-13}$; $B(K^+ \rightarrow \pi^+ \pi^0 \nu \overline{\nu}) = [1-2] \times 10^{-14}$. We also discuss a possible $CP$-odd observable.
Tunneling chemical exchange reaction $\textrm{D}+\textrm{HD}\rightarrow\textrm{D}_{2}+\textrm{H}$ in solid HD at temperatures below 1$\,$K  [PDF]
S. Sheludiakov,J. Ahokas,J. J?rvinen,D. Zvezdov,L. Lehtonen,O. Vainio,S. Vasiliev,V. V. Khmelenko,D. M. Lee
Physics , 2015,
Abstract: We report on a study of the exchange tunneling reaction D+HD$\rightarrow$D$_{2}$+H in solid HD at temperatures between 130~mK and 1.5~K by electron spin resonance. The reaction proceeds at almost the same rate ($\sim3\times10^{-27}$cm$^{3}$s$^{-1}$) within this temperature range. This observation differs strongly with the recombination rate of H atoms in solid H$_{2}$ which was found substantially reduced upon lowering temperature below 1$\,$K. These results suggest that the tunneling exchange reaction $\textrm{H}+\textrm{H}_{2}\rightarrow\textrm{H}_{2}+\textrm{H}$ can take place in solid H$_{2}$ even though recombination is suppressed at ultra low temperatures in pure hydrogen.
Amplitude analysis of the $\overline{N}N \to K^-K^+$ reaction  [PDF]
W. M. Kloet,F. Myhrer
Physics , 1996,
Abstract: A simple partial wave amplitude analysis of $\overline{p}p \rightarrow K^-K^+$ has been performed for data in the range $p_{\rm lab}$ = 360 -- 1000 MeV/$c$. In this low momentum interval only partial wave amplitudes with $J$ equal to 0, 1 and 2 are needed to obtain a good fit to the experimental data. This maximal $J$ = 2 value is smaller than what is required for the data of the reaction $\overline{p}p \rightarrow \pi^-\pi^+$ in the same momentum interval.
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