Discriminating B → D*lν form factors via polarization observables and asymmetries

被引：15

作者：

Fedele, Marco ^{[1
]}

Blanke, Monika ^{[1
,2
]}

Crivellin, Andreas ^{[3
,4
]}

Iguro, Syuhei ^{[1
,2
]}

Nierste, Ulrich ^{[1
]}

Simula, Silvano ^{[5
]}

Vittorio, Ludovico ^{[6
,7
]}

机构：

[1] Karlsruhe Inst Technol, Inst Theoret Teilchenphysik TTP, D-76131 Karlsruhe, Germany

[2] Karlsruhe Inst Technol, Inst Astroteilchenphys IAP, D-76344 Eggenstein Leopoldshafen, Germany

[3] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[4] Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland

[5] Inst Nazl Fis Nucleare, Sezione Roma Tre, Via Vasca Navale 84, I-00146 Rome, Italy

[6] Univ Savoie Mont Blanc, LAPTh, F-74941 Annecy, France

[7] CNRS, F-74941 Annecy, France

来源：

PHYSICAL REVIEW D | 2023年 / 108卷 / 05期

基金：

瑞士国家科学基金会;

关键词：

CB-VERTICAL-BAR; DISPERSIVE BOUNDS; DECAYS; HEAVY; (B)OVER-BAR;

D O I：

10.1103/PhysRevD.108.055037

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Form factors are a crucial theory input in order to extract vertical bar V-cb vertical bar from B -> D-(*())l nu decays, to calculate the Standard Model prediction for R(D-(*())) and to assess the impact of new physics. In this context, the dispersive matrix approach, a first -principle calculation of the form factors, using no experimental data but rather only lattice QCD results as input, was recently applied to B -> D-(*())l nu. It predicts (within the Standard Model) a much milder tension with the R(D-(*())) measurements than the other form factor approaches, while at the same time giving a value of vertical bar V-cb vertical bar compatible with the inclusive value. However, this comes at the expense of creating tensions with differential B -> D*l nu distributions (with light leptons). In this article, we explore the implications of using the dispersive matrix method form factors, in light of the recent Belle (II) measurements of the longitudinal polarization fraction of the D* in B -> D*l nu with light leptons, F-L(l), and the forward-backward asymmetry, A(FB)(l). We find that the dispersive matrix approach predicts a Standard Model value of F-L(l) that is in significant tension with these measurements, while mild deviations in A(FB)(l), appear. Furthermore, F-L(l) is very insensitive to new physics such that the latter cannot account for the tension between dispersive matrix predictions and its measurement. While this tension can be resolved by deforming the original dispersive matrix form factor shapes within a global fit, a tension in R(D*) reemerges. As this tension is milder than for the other form factors, it can he explained by new physics not only in the tau lepton channel but also in the light lepton modes.

引用

页数：23

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