{"arxiv_id":"1105.0970","title":"Reconciling anomalous measurements in $B_s-\\bar{B}_s$ mixing: the role of CPT-conserving and CPT-violating new physics","abstract":"Recently observed anomalies in the $B_s \\to J/\\psi \\phi$ decay and the like-sign dimuon asymmetry $A^b_{sl}$ hint at possible new physics (NP) in the $\\bsbsbar$ mixing. We parameterize the NP with four model-independent quantities: the magnitudes and phases of the dispersive part $M_{12}$ and the absorptive part $\\Gamma_{12}$ of the NP contribution to the effective Hamiltonian. We constrain these parameters using the four observables $\\Delta M_s$, $\\Delta\\Gamma_s$, the mixing phase $\\beta_s^{J/\\psi\\phi}$, and $A^b_{sl}$. Our quantitative fit indicates that the NP should contribute a significant dispersive as well as absorptive part. In fact, models that do not contribute a new absorptive part are disfavored at more than 99% confidence level. We extend this formalism to include CPT violation, and show that CPT violation by itself, or even in presence of CPT-conserving new physics without an absorptive part, helps only marginally in the simultaneous resolution of these anomalies. The NP absorptive contribution to $\\bsbsbar$ mixing therefore seems to be essential, and would imply a large branching fraction for channels like $B_s \\to \\tau^+ \\tau^-$.","primary_cat":"hep-ph","cross_cats":[],"submitted_at":"2011-05-05T03:37:35+00:00","latest_version":2,"source":"arxiv","source_label":"arXiv","source_url":null,"has_pdf":true,"has_source":false,"verdict":null,"confidence":null,"one_line_summary":null,"novelty_score":null,"correctness_risk":null,"formal_verification":null,"upvotes":0,"downvotes":0,"pith_score":0.0,"inbound_count":2,"_links":{"html":"https://pith.science/paper/1105.0970","verdict":"/api/v1/verdicts/1105.0970"}}