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Hagiwara, Kaoru,Ko, Pyungwon,Okamura, Naotoshi,Takaesu, Yoshitaro Springer-Verlag 2017 The European physical journal. C, Particles and fi Vol.77 No.3
<P>We revisit the sensitivity study of the Tokaito- Kamioka-and-Korea (T2KK) and Tokai-to-Kamioka-andOki (T2KO) proposals where a water Cerenkov detector with the 100 kton fiducial volume is placed in Korea (L = 1000 km) and Oki island (L = 653 km) in Japan, respectively, in addition to the Super-Kamiokande for determination of the neutrino mass hierarchy and leptonic CP phase (delta(CP)). We systematically study the running ratio of the nu(mu) and (nu) over bar (mu) focusing beams with dedicated background estimation for the nu(e) appearance and nu(mu) disappearance signals, especially improving treatment of the neutral-current pi(0) backgrounds. Using a nu(mu)-(nu) over bar (mu) beam ratio between 3: 2 and 2.5: 2.5 (in units of 10(21)POT with the proton energy of 40 GeV), the mass-hierarchy determination with the median sensitivity of 3-5 sigma by the T2KK and 1-4 sigma by the T2KO experiment are expected when sin(2) theta(23) = 0.5, depending on the mass-hierarchy pattern and CP phase. These sensitivities are enhanced (reduced) by 30-40% in Delta chi(2) when sin(2) theta(23) = 0.6 (0.4). The CP phase is measured with the uncertainty of 20 degrees-50 degrees by theT2KKandT2KOusing the nu(mu)-(nu) over bar (mu) focusing beam ratio between 3.5: 1.5 and 1.5: 3.5. These findings indicate that inclusion of the (nu) over bar mu focusing beam improves the sensitivities of the T2KK and T2KO experiments to both the mass-hierarchy determination and the leptonic CP phase measurement simultaneously with the preferred beam ratio being between 3: 2-2.5: 2.5 (x10(21)POT).</P>
Pyungwon Ko 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.2
Current data on K and B systems are consistent with the CKM paradigm for avor mixing and CP violation. Still, there are certain modes where we may anticipate large deviations from the SM without con ict with the CKM paradigm. We discuss three such modes within supersymmetric standard models: (i) the branching ratio of B ! Xd and direct CP asymmetry therein, (ii) Bs ! +က in the large- tan region, and (iii) Bd ! KS CP asymmetries. These modes deserve active searches at current/future B factories.
ELECTROWEAK SYMMETRY BREAKING AND COLD DARK MATTER FROM HIDDEN SECTOR TECHNICOLORS
World Scientific 2008 International Journal of Modern Physics A Vol.23 No.21
<P> We consider models with a vectorlike confining gauge theory in the hidden sector, and demonstrate that the origin of the electroweak symmetry breaking (EWSB) is due to the dimensional transmutation in the hidden sector gauge theory, and the lightest mesons in the hidden sector could be a good cold dark matter (CDM) candidate. There would be more than one neutral Higgs-like scalar bosons, and they could decay mainly into the CDM pair, if that decay channel is kinemtically allowed. </P>
Stable Higgs bosons as cold dark matter
Hosotani, Yutaka,Ko, Pyungwon,Tanaka, Minoru Elsevier 2009 Physics letters: B Vol.680 No.2
<P><B>Abstract</B></P><P>In a class of the gauge–Higgs unification models the 4D neutral Higgs boson, which is a part of the extra-dimensional component of the gauge fields, becomes absolutely stable as a consequence of the gauge invariance and dynamically generated new parity, serving as a promising candidate for cold dark matter (CDM). We show that the observed relic abundance of cold dark matter is obtained in the SO(5)×U(1) model in the warped space with the Higgs mass around 70 GeV. The Higgs–nucleon scattering cross section is found to be close to the current CDMS II and XENON10 bounds in the direct detection of dark matter.</P>
Baek, Seungwon,Kim, Yeong Gyun,Ko, Pyungwon IOP Publishing Ltd 2005 Journal of high energy physics Vol.2005 No.11
We consider the upward-going muon flux due to the WIMP annihilations in the cores of the sun and the earth, including the upper bound on the branching ratio for <I>B</I><SUB><I>s</I></SUB>→μ<SUP>+</SUP>μ<SUP>−</SUP> decay. We find that the constraint from <I>B</I><SUB><I>s</I></SUB>→μ<SUP>+</SUP>μ<SUP>−</SUP> is very strong in most parameter space, and exclude the supergravity parameter space regions where the expected upward-going muon fluxes are within the expected reach of IceCube.