On the impact of meson mixing on B s → ϕee angular observables at low q 2
Abstract Decays based on the b → sγ transition are expected to yield left-handed photons in the Standard Model, but could be particularly sensitive to New Physics contributions modifying the short-distance Wilson coefficients C $$ \mathcal{C} $$ 7 and C $$ \mathcal{C} $$ 7′ defined in the low-energy...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2023-02-01
|
| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP02(2023)096 |
| _version_ | 1797779152950001664 |
|---|---|
| author | Sébastien Descotes-Genon Ioannis Plakias Olcyr Sumensari |
| author_facet | Sébastien Descotes-Genon Ioannis Plakias Olcyr Sumensari |
| author_sort | Sébastien Descotes-Genon |
| collection | DOAJ |
| description | Abstract Decays based on the b → sγ transition are expected to yield left-handed photons in the Standard Model, but could be particularly sensitive to New Physics contributions modifying the short-distance Wilson coefficients C $$ \mathcal{C} $$ 7 and C $$ \mathcal{C} $$ 7′ defined in the low-energy Effective Field Theory. These coefficients can be determined by combining observables of several modes, among which B s → ϕee at low q 2, in a kinematic range where the photon-pole is dominant. We investigate the impact of B s − B ¯ $$ \overline{B} $$ s mixing on the angular observables available for this mode, which induces a time-dependent modulation governed by interference terms between mixing and decay that are sensitive to the moduli and phases of C $$ \mathcal{C} $$ 7 and C $$ \mathcal{C} $$ 7′. These interference terms can be extracted through a time-dependent analysis but they also affect time-integrated observables. In particular, we show that the asymmetries A T 2 $$ {A}_T^{(2)} $$ and A T Im ; CP $$ {A}_T^{\left(\operatorname{Im}\right); CP} $$ receive terms of potentially similar size from mixing-independent and mixing-induced terms, and we discuss how the constraints coming from the angular analysis of B s → ϕee at low q 2 should be interpreted in the presence of mixing. |
| first_indexed | 2024-03-12T23:27:32Z |
| format | Article |
| id | doaj.art-c331d2a072ac4797b2aa549612375a4c |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-12T23:27:32Z |
| publishDate | 2023-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-c331d2a072ac4797b2aa549612375a4c2023-07-16T11:05:52ZengSpringerOpenJournal of High Energy Physics1029-84792023-02-012023213610.1007/JHEP02(2023)096On the impact of meson mixing on B s → ϕee angular observables at low q 2Sébastien Descotes-Genon0Ioannis Plakias1Olcyr Sumensari2Université Paris-Saclay, CNRS/IN2P3, IJCLabUniversité Paris-Saclay, CNRS/IN2P3, IJCLabUniversité Paris-Saclay, CNRS/IN2P3, IJCLabAbstract Decays based on the b → sγ transition are expected to yield left-handed photons in the Standard Model, but could be particularly sensitive to New Physics contributions modifying the short-distance Wilson coefficients C $$ \mathcal{C} $$ 7 and C $$ \mathcal{C} $$ 7′ defined in the low-energy Effective Field Theory. These coefficients can be determined by combining observables of several modes, among which B s → ϕee at low q 2, in a kinematic range where the photon-pole is dominant. We investigate the impact of B s − B ¯ $$ \overline{B} $$ s mixing on the angular observables available for this mode, which induces a time-dependent modulation governed by interference terms between mixing and decay that are sensitive to the moduli and phases of C $$ \mathcal{C} $$ 7 and C $$ \mathcal{C} $$ 7′. These interference terms can be extracted through a time-dependent analysis but they also affect time-integrated observables. In particular, we show that the asymmetries A T 2 $$ {A}_T^{(2)} $$ and A T Im ; CP $$ {A}_T^{\left(\operatorname{Im}\right); CP} $$ receive terms of potentially similar size from mixing-independent and mixing-induced terms, and we discuss how the constraints coming from the angular analysis of B s → ϕee at low q 2 should be interpreted in the presence of mixing.https://doi.org/10.1007/JHEP02(2023)096Bottom QuarksRare DecaysSemi-Leptonic DecaysCP Violation |
| spellingShingle | Sébastien Descotes-Genon Ioannis Plakias Olcyr Sumensari On the impact of meson mixing on B s → ϕee angular observables at low q 2 Journal of High Energy Physics Bottom Quarks Rare Decays Semi-Leptonic Decays CP Violation |
| title | On the impact of meson mixing on B s → ϕee angular observables at low q 2 |
| title_full | On the impact of meson mixing on B s → ϕee angular observables at low q 2 |
| title_fullStr | On the impact of meson mixing on B s → ϕee angular observables at low q 2 |
| title_full_unstemmed | On the impact of meson mixing on B s → ϕee angular observables at low q 2 |
| title_short | On the impact of meson mixing on B s → ϕee angular observables at low q 2 |
| title_sort | on the impact of meson mixing on b s ϕee angular observables at low q 2 |
| topic | Bottom Quarks Rare Decays Semi-Leptonic Decays CP Violation |
| url | https://doi.org/10.1007/JHEP02(2023)096 |
| work_keys_str_mv | AT sebastiendescotesgenon ontheimpactofmesonmixingonbspheeangularobservablesatlowq2 AT ioannisplakias ontheimpactofmesonmixingonbspheeangularobservablesatlowq2 AT olcyrsumensari ontheimpactofmesonmixingonbspheeangularobservablesatlowq2 |