Bogdan A. Dobrescu
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Bogdan A. Dobrescu has a total of 3 co-authors. Here are the top co-authors by number of shared publications:
- Thomas Appelquist
Department of Physics Sloane Laboratory Yale University 06520 New Haven Connecticut USA
3 shared publications - Erich Poppitz
Department of Physics Yale University New Haven 06520-8120 CT USA
2 shared publications - Hsin-Chia Cheng
Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637
2 shared publications
Latest Publications
- Open Access
Bounds on Universal Extra Dimensions
We show that the bound from the electroweak data on the size of extra dimensions accessible to all the standard model fields is rather loose. These "universal" extra dimensions could have a compactification scale as low as 300 GeV for one extra dimension. This is because the Kaluza-Klein number is conserved and thus the contributions to the electroweak observables arise only from loops. The main constraint comes from weak-isospin violation effects. We also compute the contributions to the S parameter and the $Zb\bar{b}$ vertex. The direct bound on the compactification scale is set by CDF and D0 in the few hundred GeV range, and the Run II of the Tevatron will either discover extra dimensions or else it could significantly raise the bound on the compactification scale. In the case of two universal extra dimensions, the current lower bound on the compactification scale depends logarithmically on the ultra-violet cutoff of the higher dimensional theory, but can be estimated to lie between 400 and 800 GeV. With three or more extra dimensions, the cutoff dependence may be too strong to allow an estimate.Open AccessBounds on Universal Extra Dimensions
We show that the bound from the electroweak data on the size of extra dimensions accessible to all the standard model fields is rather loose. These "universal" extra dimensions could have a compactification scale as low as 300 GeV for one extra dimension. This is because the Kaluza-Klein number is conserved and thus the contributions to the electroweak observables arise only from loops. The main constraint comes from weak-isospin violation effects. We also compute the contributions to the S parameter and the $Zb\bar{b}$ vertex. The direct bound on the compactification scale is set by CDF and D0 in the few hundred GeV range, and the Run II of the Tevatron will either discover extra dimensions or else it could significantly raise the bound on the compactification scale. In the case of two universal extra dimensions, the current lower bound on the compactification scale depends logarithmically on the ultra-violet cutoff of the higher dimensional theory, but can be estimated to lie between 400 and 800 GeV. With three or more extra dimensions, the cutoff dependence may be too strong to allow an estimate. - 27 June 2001
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 87 (3) , 031801
Number of Fermion Generations Derived from Anomaly Cancellation
We prove that global anomaly cancellation requires more than one generation of quarks and leptons, provided that the standard model fields propagate in two universal extra dimensions. Furthermore, if the fermions of different generations have the same gauge charges and chiralities, then global anomaly cancellation implies that there must be three generations.
- 27 June 2001
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 87 (3) , 031801
Number of Fermion Generations Derived from Anomaly Cancellation
We prove that global anomaly cancellation requires more than one generation of quarks and leptons, provided that the standard model fields propagate in two universal extra dimensions. Furthermore, if the fermions of different generations have the same gauge charges and chiralities, then global anomaly cancellation implies that there must be three generations.
- Top Cited Papers
- 21 June 2001
- Published by American Physical Society (APS) in Physical Review D
- Vol. 64 (3) , 035002
Bounds on universal extra dimensions
We show that the bound from the electroweak data on the size of extra dimensions accessible to all the standard model fields is rather loose. These “universal” extra dimensions could have a compactification scale as low as 300 GeV for one extra dimension. This is because the Kaluza-Klein number is conserved and thus the contributions to the electroweak observables arise only from loops. The main constraint comes from weak-isospin violation effects. We also compute the contributions to the S parameter and the vertex. The direct bound on the compactification scale is set by CDF and D0 in the few hundred GeV range, and run II of the Tevatron will either discover extra dimensions or else it could significantly raise the bound on the compactification scale. In the case of two universal extra dimensions, the current lower bound on the compactification scale depends logarithmically on the ultraviolet cutoff of the higher dimensional theory, but can be estimated to lie between 400 and 800 GeV. With three or more extra dimensions, the cutoff dependence may be too strong to allow an estimate.- 21 June 2001
- Published by American Physical Society (APS) in Physical Review D
- Vol. 64 (3) , 035002
Top Cited PapersBounds on universal extra dimensions
We show that the bound from the electroweak data on the size of extra dimensions accessible to all the standard model fields is rather loose. These “universal” extra dimensions could have a compactification scale as low as 300 GeV for one extra dimension. This is because the Kaluza-Klein number is conserved and thus the contributions to the electroweak observables arise only from loops. The main constraint comes from weak-isospin violation effects. We also compute the contributions to the S parameter and the vertex. The direct bound on the compactification scale is set by CDF and D0 in the few hundred GeV range, and run II of the Tevatron will either discover extra dimensions or else it could significantly raise the bound on the compactification scale. In the case of two universal extra dimensions, the current lower bound on the compactification scale depends logarithmically on the ultraviolet cutoff of the higher dimensional theory, but can be estimated to lie between 400 and 800 GeV. With three or more extra dimensions, the cutoff dependence may be too strong to allow an estimate. - Open Access
Universal Extra Dimensions and the Muon Magnetic Moment
We analyze the muon anomalous magnetic moment in the context of universal extra dimensions. Our computation shows that the bound from electroweak data on the size of these dimensions allows only a small shift in the muon magnetic moment given by Kaluza-Klein modes of standard model fields. In the well-motivated case of two universal extra dimensions, additional contributions arising from physics at scales where the effective 6-dimensional standard model breaks down, given by dimension-ten operators, have a natural size comparable to the sensitivity of the muon (g-2) experiment at BNL.
Open AccessUniversal Extra Dimensions and the Muon Magnetic Moment
We analyze the muon anomalous magnetic moment in the context of universal extra dimensions. Our computation shows that the bound from electroweak data on the size of these dimensions allows only a small shift in the muon magnetic moment given by Kaluza-Klein modes of standard model fields. In the well-motivated case of two universal extra dimensions, additional contributions arising from physics at scales where the effective 6-dimensional standard model breaks down, given by dimension-ten operators, have a natural size comparable to the sensitivity of the muon (g-2) experiment at BNL.
- Open Access
Number of Fermion Generations Derived from Anomaly Cancellation
We prove that global anomaly cancellation requires more than one generation of quarks and leptons, provided that the standard model fields propagate in two universal extra dimensions. Furthermore, if the fermions of different generations have the same gauge charges and chiralities, then global anomaly cancellation implies that there must be three generations.
Open AccessNumber of Fermion Generations Derived from Anomaly Cancellation
We prove that global anomaly cancellation requires more than one generation of quarks and leptons, provided that the standard model fields propagate in two universal extra dimensions. Furthermore, if the fermions of different generations have the same gauge charges and chiralities, then global anomaly cancellation implies that there must be three generations.