Successive Equilibration in Quark-Gluon Plasma

We consider an extension of the standard electroweak theory with gauge group SU (2) L × SU (2) R × U (1)Ỹ , where the gauge bosons of the extra SU (2) R factor do not couple to ordinary fermions. We show that precision electroweak data and flavour physics provide quite stringent indirect constraints on its parameter space, but still allow for relatively light non-standard gauge and Higgs bosons. We then consider the model phenomenology at high-energy colliders, and observe that in the gauge boson sector present bounds and possible future signals are dominated by Z ′ production. In summary, indirect constraints on the charged gauge boson sector are so tight that observable new effects must be connected either with the neutral gauge boson sector or with the extended Higgs sector of the model.

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“…In the charged vector boson sector, and in the (W L , W R ) basis: 17) In the limit of small mixing, as defined above, and in obvious notation:…”

Section: Vector Bosonsmentioning

confidence: 99%

Phenomenological aspects of a fermiophobic SU (2) × SU (2) × U (l) extension of the standard model

Donini¹,

Feruglio²,

Matias³

et al. 1997

Nuclear Physics B

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“…The semi-inclusive method [22,25,26] uses a sum of exclusive final states in which possible X s systems are combined with the photon, and kinematic constraints of 4S production are used to suppress backgrounds. We have chosen this method and made several improvements over the previous analyses.…”

Section: Introductionmentioning

confidence: 99%

Measurements of theB→Xsγbranching fraction and photon spectrum from a sum of exclusive final states

Collaboration¹,

Aubert²

2005

Phys. Rev. D

104

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Using 88.9 million BB events collected by the BABAR detector at the 4S, we measure the branching fraction for the radiative penguin process B ! X s from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy E > 1:9 GeV is Bb ! s 3:27 0:18stat 0:55 ÿ0:40 syst 0:04 ÿ0:09 theory 10 ÿ4 . We also measure the isospin asymmetry between B ÿ ! X s u and B 0 ! X s d to be 0ÿ ÿ0:006 0:058stat 0:009syst 0:024B 0 =B ÿ . The photon energy spectrum is measured in the B rest frame, from which moments are derived for different values of the minimum photon energy. We present fits to the photon spectrum and moments which give the heavy-quark parameters m b and 2 . The fitted parameters are consistent with those obtained from semileptonic B ! X c ' decays, and are useful inputs for the extraction of jV ub j from measurements of semileptonic B ! X u ' decays.

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“…The CLEO group reported the first observation of the B ! X s g radiative penguin decay [1]. The measured branching fraction for this process has been used to set the most stringent indirect limit on the charged Higgs mass and to constrain the magnitude of the effective Wilson coefficient of the electromagnetic penguin operator jC eff 7 j [2].…”

mentioning

confidence: 99%

Observation of the DecayB→Kl+l−
Abe¹,
R²,
Adachi³
et al. 2001
Phys. Rev. Lett.
80
1
3
0
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Successive Equilibration in Quark-Gluon Plasma

Cited by 287 publications

References 0 publications

Phenomenological aspects of a fermiophobic SU (2) × SU (2) × U (l) extension of the standard model

Phenomenological aspects of a fermiophobic SU (2) × SU (2) × U (l) extension of the standard model

Measurements of theB→Xsγbranching fraction and photon spectrum from a sum of exclusive final states

Observation of the DecayB→Kl+l−
Abe¹,
R²,
Adachi³
et al. 2001
Phys. Rev. Lett.
80
1
3
0
View full text Add to dashboard Cite

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Successive Equilibration in Quark-Gluon Plasma

Cited by 287 publications

References 0 publications

Phenomenological aspects of a fermiophobic SU (2) × SU (2) × U (l) extension of the standard model

Phenomenological aspects of a fermiophobic SU (2) × SU (2) × U (l) extension of the standard model

Measurements of theB→Xsγbranching fraction and photon spectrum from a sum of exclusive final states

Observation of the DecayB→Kl+l−Abe1, R2, Adachi3 et al. 2001Phys. Rev. Lett.80130View full textAdd to dashboardCite

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Observation of the DecayB→Kl+l−
Abe¹,
R²,
Adachi³
et al. 2001
Phys. Rev. Lett.
80
1
3
0
View full text Add to dashboard Cite