Possibility of large lifetime differences in neutral B meson systems
| dc.creator | Dighe, Amol | |
| dc.creator | Kundu, Anirban | |
| dc.creator | Nandi, Soumitra | |
| dc.date | 2007-05-31 | |
| dc.date.accessioned | 2026-07-07T10:55:57Z | |
| dc.date.available | 2026-07-07T10:55:57Z | |
| dc.description | We investigate new physics models that can increase the lifetime differences in the $B_q$--$\bar{B}_q$ systems ($q = d,s$) above their standard model values. If both $B_q$ as well as $\bar{B}_q$ can decay to a final state through flavour dependent new physics interactions, the so-called Grossman bound may be evaded. As examples, we consider the scalar leptoquark model and $λ''$-type R-parity violating supersymmetry. We find that models with a scalar leptoquark can enhance $ΔΓ_s/Γ_s$ all the way up to its experimental upper bound and $ΔΓ_d/Γ_d$ to as much as $\sim 2.5%$, at the same time allowing the CP violating phase $β_s$ to vary between $- 45^\circ$ and $20^\circ$. R-parity violating supersymmetry models cannot enhance the lifetime differences significantly, but can enhance the value of $β_s$ up to $\sim \pm 20^\circ$. This may bring the values of $ΔΓ_q/Γ_q$ as well as $β_s$ within the measurement capabilities of $B$ factories and LHCb. We also obtain bounds on combinations of these new physics couplings, and predict enhanced branching ratios of $B_{s/d} \to τ^+ τ^-$. | |
| dc.description | 20 pages, 9 eps figures, revtex4 format | |
| dc.identifier | https://arxiv.org/abs/0705.4547 | |
| dc.identifier | http://arxiv.org/abs/0705.4547 | |
| dc.identifier | Phys.Rev.D76:054005,2007 | |
| dc.identifier | doi:10.1103/PhysRevD.76.054005 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/186252 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Possibility of large lifetime differences in neutral B meson systems | |
| dc.type | text |