1,070 research outputs found

    The Replication Argument for Incompatibilism

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    In this paper, I articulate an argument for incompatibilism about moral responsibility and determinism. My argument comes in the form of an extended story, modeled loosely on Peter van Inwagen’s “rollback argument” scenario. I thus call it “the replication argument.” As I aim to bring out, though the argument is inspired by so-called “manipulation” and “original design” arguments, the argument is not a version of either such argument—and plausibly has advantages over both. The result, I believe, is a more convincing incompatibilist argument than those we have considered previously

    O(\alpha^2 \ln(m_\mu/m_e)) Corrections to Electron Energy Spectrum in Muon Decay

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    O(\alpha^2 \ln(m_\mu/m_e)) corrections to electron energy spectrum in muon decay are computed using perturbative fragmentation function approach. The magnitude of these corrections is comparable to anticipated precision of the TWIST experiment at TRIUMF where Michel parameters will be extracted from the measurement of the electron energy spectrum in muon decay.Comment: 8 pages, LaTeX, revtex4.cls, 1 PostScript figur

    Window on Higgs Boson: Fourth Generation bâ€Čb^\prime Decays Revisited

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    Direct and indirect searches of the Higgs boson suggest that 113 GeV â‰ČmHâ‰Č\lesssim m_H \lesssim 170 GeV is likely. With the LEP era over and the Tevatron Run II search via ppˉ→WH+Xp\bar p \to WH+X arduous, we revisit a case where WHWH or ZH+ZH + jets could arise via strong bâ€Čbˉâ€Čb^\prime\bar b^\prime pair production. In contrast to 10 years ago, the tight electroweak constraint on tâ€Čt^\prime--bâ€Čb^\prime (hence tâ€Čt^\prime--tt) splitting reduces FCNC bâ€Č→bZb^\prime\to bZ, bHbH rates, making bâ€Č→cWb^\prime\to cW naturally competitive. Such a "cocktail solution" is precisely the mix that could evade the CDF search for bâ€Č→bZb^\prime\to bZ, and the bâ€Čb^\prime may well be lurking below the top. In light of the Higgs program, this two-in-one strategy should be pursued.Comment: 4 pages, RevTex, 4 eps figures, One more figure, version to be published in Phys. Rev.

    Bounds on the mass of the b' quark, revisited

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    Recent results from the DELPHI collaboration led us to review the present bounds on the b' quark mass. We use all available experimental data for m_b' > 96 GeV to constrain the b' quark mass as a function of the Cabibbo-Kobayashi-Maskawa elements in a sequential four generations model. We find that there is still room for a b' with a mass larger than 96 GeV.Comment: 9 pages and 7 figures. REVTEX

    Gravitational decays of heavy particles in large extra dimensions

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    In the framework of quantum gravity propagating in large extra dimensions, we analyze the inclusive radiative emission of Kaluza-Klein spin-2 gravitons in the two-fermions decays of massive gauge bosons, heavy quarks, Higgs bosons, and in the two-massive gauge bosons decay of Higgs bosons. We provide analytical expressions for the square modulus of amplitudes summed over polarizations, and numerical results for the widths and branching ratios. The corresponding decays in the Z, top quark, and Higgs boson sectors of the standard model are analyzed in the light of present and future experiments.Comment: 29 pages, 4 figures, notation slightly changed, a few comments adde
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