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| Natura: | Preprint |
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2026
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| Accesso online: | https://arxiv.org/abs/2603.27753 |
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| _version_ | 1866910082467364864 |
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| author | Altmannshofer, Wolfgang Christensen, Samuel G. Stangl, Peter |
| author_facet | Altmannshofer, Wolfgang Christensen, Samuel G. Stangl, Peter |
| contents | Recent results from LHCb have confirmed the long-standing $P_5^\prime$ anomaly, an intriguing discrepancy in the angular distribution of the $B \to K^* μ^+μ^-$ decay that might be a sign of new physics. In addition, the new results hint at a non-zero value for $S_7$, another observable that characterizes the $B \to K^* μ^+μ^-$ angular distribution. We stress that a non-zero $S_7$ cannot be explained by heavy new physics but instead necessarily requires a sizable hadronic effect that introduces a strong phase. We argue that, under plausible assumptions, the hadronic effect is of the correct size to also explain $P_5^\prime$. The direct CP asymmetry in $B \to K^* μ^+μ^-$ emerges in principle as a clean probe of new physics in such a scenario. We show that a combined fit of hadronic parameters and Wilson coefficients retains sensitivity to new physics and we find strong bounds on imaginary parts of new physics Wilson coefficients. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_27753 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Large Hadronic Effects in $B \to K^* μμ$? Altmannshofer, Wolfgang Christensen, Samuel G. Stangl, Peter High Energy Physics - Phenomenology Recent results from LHCb have confirmed the long-standing $P_5^\prime$ anomaly, an intriguing discrepancy in the angular distribution of the $B \to K^* μ^+μ^-$ decay that might be a sign of new physics. In addition, the new results hint at a non-zero value for $S_7$, another observable that characterizes the $B \to K^* μ^+μ^-$ angular distribution. We stress that a non-zero $S_7$ cannot be explained by heavy new physics but instead necessarily requires a sizable hadronic effect that introduces a strong phase. We argue that, under plausible assumptions, the hadronic effect is of the correct size to also explain $P_5^\prime$. The direct CP asymmetry in $B \to K^* μ^+μ^-$ emerges in principle as a clean probe of new physics in such a scenario. We show that a combined fit of hadronic parameters and Wilson coefficients retains sensitivity to new physics and we find strong bounds on imaginary parts of new physics Wilson coefficients. |
| title | Large Hadronic Effects in $B \to K^* μμ$? |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2603.27753 |