### Abstract

We study the decay modes of a new, light spin-0 particle, arguing that if the mass of the (pseudo)scalar is ∼ 11-15 GeV, it can have an appreciable branching ratio into bottomonium, in particular the rare %s. Using non-relativistic QCD (NRQCD), we calculate its decay rate to bottomonia for mass splittings greater than the typical momentum transfer within the bound state. It can exceed that of decays to other Standard Model fermions under the assumption of couplings proportional to those of the Standard Model. At smaller splittings, where our computational methods break down, we estimate the rate into bottomonia using data-driven methods. When the spin-0 state decays to bottomonia whose mass is too light to produce B-meson pairs, we get a qualitatively new experimental signature, decays to 6-quarks invisible to 6-tagging. Such a light, spinless particle can arise in extended Higgs sectors, making this channel potentially observable in decay chains initiated by the subdominant decay of a Standard Model-like Higgs to a pair of them.

Original language | English (US) |
---|---|

Article number | 133 |

Journal | Journal of High Energy Physics |

Volume | 2012 |

Issue number | 8 |

DOIs | |

State | Published - Sep 10 2012 |

Externally published | Yes |

### Fingerprint

### Keywords

- Beyond Standard Model
- Heavy Quark Physics
- Rare Decays

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Journal of High Energy Physics*,

*2012*(8), [133]. https://doi.org/10.1007/JHEP08(2012)133

**Implications of a new light scalar near the bottomonium regime.** / Baumgart, Matthew; Katz, Andrey.

Research output: Contribution to journal › Article

*Journal of High Energy Physics*, vol. 2012, no. 8, 133. https://doi.org/10.1007/JHEP08(2012)133

}

TY - JOUR

T1 - Implications of a new light scalar near the bottomonium regime

AU - Baumgart, Matthew

AU - Katz, Andrey

PY - 2012/9/10

Y1 - 2012/9/10

N2 - We study the decay modes of a new, light spin-0 particle, arguing that if the mass of the (pseudo)scalar is ∼ 11-15 GeV, it can have an appreciable branching ratio into bottomonium, in particular the rare %s. Using non-relativistic QCD (NRQCD), we calculate its decay rate to bottomonia for mass splittings greater than the typical momentum transfer within the bound state. It can exceed that of decays to other Standard Model fermions under the assumption of couplings proportional to those of the Standard Model. At smaller splittings, where our computational methods break down, we estimate the rate into bottomonia using data-driven methods. When the spin-0 state decays to bottomonia whose mass is too light to produce B-meson pairs, we get a qualitatively new experimental signature, decays to 6-quarks invisible to 6-tagging. Such a light, spinless particle can arise in extended Higgs sectors, making this channel potentially observable in decay chains initiated by the subdominant decay of a Standard Model-like Higgs to a pair of them.

AB - We study the decay modes of a new, light spin-0 particle, arguing that if the mass of the (pseudo)scalar is ∼ 11-15 GeV, it can have an appreciable branching ratio into bottomonium, in particular the rare %s. Using non-relativistic QCD (NRQCD), we calculate its decay rate to bottomonia for mass splittings greater than the typical momentum transfer within the bound state. It can exceed that of decays to other Standard Model fermions under the assumption of couplings proportional to those of the Standard Model. At smaller splittings, where our computational methods break down, we estimate the rate into bottomonia using data-driven methods. When the spin-0 state decays to bottomonia whose mass is too light to produce B-meson pairs, we get a qualitatively new experimental signature, decays to 6-quarks invisible to 6-tagging. Such a light, spinless particle can arise in extended Higgs sectors, making this channel potentially observable in decay chains initiated by the subdominant decay of a Standard Model-like Higgs to a pair of them.

KW - Beyond Standard Model

KW - Heavy Quark Physics

KW - Rare Decays

UR - http://www.scopus.com/inward/record.url?scp=84865714318&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84865714318&partnerID=8YFLogxK

U2 - 10.1007/JHEP08(2012)133

DO - 10.1007/JHEP08(2012)133

M3 - Article

AN - SCOPUS:84865714318

VL - 2012

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 8

M1 - 133

ER -