In the past Wei-Shu Hou has collaborated on articles with John M. Cornwall and J.L. Goity. One of their most recent publications is Gauge-invariant calculations in finite-temperature QCD: Landau ghost and magnetic mass☆. Which was published in journal Physics Letters B.

More information about Wei-Shu Hou research including statistics on their citations can be found on their Copernicus Academic profile page.

Wei-Shu Hou's Articles: (12)

Gauge-invariant calculations in finite-temperature QCD: Landau ghost and magnetic mass☆

AbstractUsing a recently-introduced technique for resumming QCD graphs in terms of a gauge-invariant propagator, we show that in one-loop perturbation theory the Landau ghost for timelike gluons persists up to a temperature TL ≌ 3Λ, while the perturbative Landau ghost for magnetic gluons exists at all temperatures. The gauge technique is used to find a non-perturbative solution to the Schwinger-Dyson equation for magnetic gluons; the solution shows generation of a magnetic mass and no Landau ghost.

Isospin splittings in heavy meson systems. Understanding mB0−mB−≈0 MeV

AbstractExisting data is shown to imply that isospin splittings in heavy meson masses induced by md−mu≠0 are smaller than in K mesons. It also implies a suppression of SU(3) breaking effects in hyperfine splittings to leading order in 1mQ. Hence, pseudoscalar and vector heavy mesons should have similar isospin splittings, empirically given by MQd−MQu∼(1.3±0.5)+(5.3±1.0) Q MeV (Q is the heavy quark charge). Using first order perturbation theory in the light quark masses and a generalized version of vector meson dominance for the QED contribution, we arrive at a similar result. Thus, the recent observation that MB0−MB−≈0 MeV can be accounted for.

Tree level t→ch0 or h0→tc decays

AbstractIn a third type of two Higgs model, where neutral scalar bosons possess flavor changing uiuih0 couplings proportional to mimj, low energy constraints are evaded. With the top as the heaviest fermion, tree level flavor changing t→ch0 or h0→ tc decays may be competitive with, if not dominant over, the corresponding t→bW∗ or h0→bb decays. The CDF limit of mt>91 GeV may be evaded by the t→ch0 mode if mh0

On right-handed b decay dominance

AbstractIn the Gronau-Wakaizumi scenario of right-handed b decay dominance, VcdR is vanishingly small while large VtdR and VtsR lead to potential problems with the KL-KS mass difference. Allowing the b → u transition to be dominantly left-handed, we arrive at a more symmetric form of quark mixing matrices, where VL, VR are constituted mostly of mixing between first and second, and second and third generations, respectively. A third possibility of having b → c left-handed as usual, but b → u dominantly right-handed, is ruled out by the ϵ parameter and Bd mixing. Experimental consequences such as Cabibbo suppressed decays, penguin rates, and CP violation, are discussed. The best way to rule out right-handed b → c decay dominance is to find B → D(∗)D−(∗) modes at the 0.1% level.

Radiative Majorama neutrino masses

AbstractWe show how Majorana neutrino masses can be radiatively generated, in model where charged lepton masses are radiatively induced, order by order, from heavy sequential lepton seeds. Only the new sequential neutral lepton has a right-handed partner, and its Majorana mass provides the seeds for Majorana neutrino mass generation. Saturating the cosmological bound of 50 eV with mντ we find that mνμ and mνe could be at most 10−2, and 10−3eV, respectively. The electron neutrino mass may vanish in the limit of degenerate charged Higgs bosons. Unfortunately, νe−ντ mixing is also radiatively induced, and is too smallk for the sake of solving the solar neutrino problem via the Mikheyev-Smirnov-Wolfenstein effect.

Semi-leptonic flavour-changing neutral-current decays of the fourth generation b′-quark

AbstractWe study the decay modes b′ → bℓ+ℓ−, b′ → bνν for minb′ ⪅MZ including virtual γ, Z0, and box diagram contributions, the latter complicating the computation considerably. Due to the effect of the Z0 propagator and the finite Z0 width, these decay rates are substantial. The box diagram is subleading but also not negligible. As a consequence, the lepton pair mass distribution is rather flat and high mass ℓ+ℓ− or νν pairs are much more abundant than suggested from phase space. It is found that b′ → bZ∗ (loosely denoting the sum of ifb′ → bℓ+ℓ−, b′ → νν and b′ → bqq) is of similar order as the b′ → bg decay mode, and is likely to dominate in case mt′ is very heavy. With three light neutrinos, the decay b′ → bνν is similar order as b′ → b γ, however, the b′ → bℓ+ℓ− mode are relatively suppressed. The flavour-changing neutral-current b′ decay scenario is thus shown to be quite rich. A comprehensive, but theoretical, discussion is given regarding b′ discovery potentials at present and future colliders.

Prediction of three-body B0→ρ−pn̄, π−pn̄ decay rates

AbstractWe predict the rates of the charmless three-body B0→ρ−pn̄ and π−pn̄ modes due to weak vector current contributions to be ∼4×10−6 and 2×10−6, respectively. The basis is a factorization approach of current produced nucleon pairs, together with an isospin transformation that relates nucleon weak vector form factors to electromagnetic form factors. Adding the axial vector current contribution, we find B0→ρ−pn̄ and B+→ρ0pn̄ to be at 10−5 order. The three-body modes appear to dominate over the two-body modes such as B→pp̄, pΛ̄.

Possible hints and search for glueball production in charmless rare B decays

AbstractRecent data on B→pp̄K, K0ππ and KKK hint at a ∼2.3 GeV object recoiling against a kaon. This could be the narrow state observed in J/ψ→γξ. Nonobservation in pp̄ annihilation implies B(ξ→pp̄)∼ few ×10−3, consistent with ηc and J/ψ decays, but there are actual hints in pp̄→φφ and pp→pπ+π−π+π−p. Simple modeling shows B(B→ξK)B(ξ→pp̄)∼1×10−6, appearing as a spike in the pp̄ spectrum, with ∼ 30 events per 100 fb−1; modes such as KKsKs, Kφφ, K4π (Kf2ππ) etc. should be explored. The underlying dynamics of g∗→gξ is analogous to g∗→gη′ or gluon fragmentation. Discovery of sizable B→ξK could be useful for CP violation studies.

Searching for new scalar bosons via triple-top signature in cg→tS0→ttt¯

AbstractThe alignment phenomenon, that the 125 GeV h0 boson so resembles the Standard Model Higgs boson, can be understood in a two Higgs doublet model without discrete symmetry. New Yukawa couplings ρtt and ρtc offer new avenues to discover the extra scalar H0 and pseudoscalar A0. We propose to search for cg→tH0, tA0 followed by H0, A0→tt¯, tc¯, where same-sign dileptons could be the harbinger, with triple-top, in the signature of three leptons plus three b-jets, as confirmation. Discovery could touch upon the origin of baryon asymmetry of the Universe.

Electroweak baryogenesis driven by extra top Yukawa couplings

AbstractWe study electroweak baryogenesis driven by the top quark in a general two Higgs doublet model with flavor-changing Yukawa couplings, keeping the Higgs potential CP invariant. With Higgs sector couplings and the additional top Yukawa coupling ρtt all of O(1), one naturally has sizable CP violation that fuels the cosmic baryon asymmetry. Even if ρtt vanishes, the favor-changing coupling ρtc can still lead to successful baryogenesis. Phenomenological consequences such as t→ch, τ→μγ electron electric dipole moment, h→γγ, and hhh coupling are discussed.

Implications for B→ηK and B→glueball+K modes from observed large B→η′K+X

AbstractThe unexpectedly large branching ratios for B→η′K(η′Xs) decays could be of gluonic origin. We study the implications for B→ηK(ηXs) and PK(PXs), where P is the pseudoscalar glueball. In the mechanism proposed by Fritzsch, large branching ratios are predicted for these modes. The B→ηK rate is barely within the experimental limit, and B→PK, PXs could be at the 0.1% and 1% level, respectively. Smaller but less definite results are found for the mechanism of g∗→η′g via the gluon anomaly.

On the mixing amplitude of Jψ and vector glueball O

AbstractWe study the mixing angle θOψ and mixing amplitude fOψ of Jψ and vector glueball O based on the framework of potential models of heavy quarks and constituent gluons. While the state vectors of Jψ and O are constructed from the wave functions of fewbody Schroedinger equations, the mixing dynamics is governed by perturbative QCD. We obtain a value of the mixing angle of |tan θOψ| ≈ 0.015 and the mixing amplitude of |fOψ(mOψ2)| ≈ 0.008 GeV2. Within our approximation scheme, this result is comparable with phenomenological analysis.

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