Implications of a new light scalar near the bottomonium regime

Matthew Baumgart, Andrey Katz

Research output: Contribution to journalArticle

7 Citations (Scopus)

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 languageEnglish (US)
Article number133
JournalJournal of High Energy Physics
Volume2012
Issue number8
DOIs
StatePublished - Sep 10 2012
Externally publishedYes

Fingerprint

scalars
decay
particle spin
marking
decay rates
momentum transfer
sectors
mesons
quantum chromodynamics
breakdown
fermions
signatures
quarks
estimates

Keywords

  • Beyond Standard Model
  • Heavy Quark Physics
  • Rare Decays

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

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

In: Journal of High Energy Physics, Vol. 2012, No. 8, 133, 10.09.2012.

Research output: Contribution to journalArticle

@article{1d7457a7b02d430d97659e32bfb8fd0a,
title = "Implications of a new light scalar near the bottomonium regime",
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.",
keywords = "Beyond Standard Model, Heavy Quark Physics, Rare Decays",
author = "Matthew Baumgart and Andrey Katz",
year = "2012",
month = "9",
day = "10",
doi = "10.1007/JHEP08(2012)133",
language = "English (US)",
volume = "2012",
journal = "Journal of High Energy Physics",
issn = "1029-8479",
publisher = "Springer Verlag",
number = "8",

}

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 -