2015:groups:higgs:morehiggs:largesplit

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2015:groups:higgs:morehiggs:largesplit [2015/06/17 15:13] jose_miguel.no |
2015:groups:higgs:morehiggs:largesplit [2015/06/18 18:09] jose_miguel.no |
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**Responsible:** Jose Mi No | **Responsible:** Jose Mi No | ||

- | **Members:** Ken Mimasu, Werner Porod, Jérémy Bernon, Andrey Katz, Dipan Sengupta | + | **Members:** Ken Mimasu, Werner Porod, Jérémy Bernon, Andrey Katz, Dipan Sengupta, Sanjoy Biswas |

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**Project**: | **Project**: | ||

- | - Assume light A0 scenario for 2HDM (m_A0 < 100 GeV, e.g. [[http://arxiv.org/abs/1412.3385]]). For TypeII 2HDM, a large splitting m_H0 - m_A0 ~ 200-300 GeV is required. For TypeI 2HDM, sizable m_H0 - m_A0 is not required but perfectly possible. In both cases, g g -> H0 -> Z A0 -> ll bb could probe this scenario for low tan_beta (< 5) as a complementary search to bbA0 ([[2015:groups:higgs:morehiggs:lowmassa]]). | + | * Assume light A0 scenario for 2HDM (m_A0 < 100 GeV, e.g. [[http://arxiv.org/abs/1412.3385]]). For TypeII 2HDM, a large splitting m_H0 - m_A0 ~ 200-300 GeV is required. For TypeI 2HDM, sizable m_H0 - m_A0 is not required but perfectly possible. In both cases, g g -> H0 -> Z A0 -> ll bb could probe this scenario for low tan_beta (< 5) as a complementary search to bbA0 ([[2015:groups:higgs:morehiggs:lowmassa]]). |

- | - Use [[http://cds.cern.ch/record/2014119]] to extract the limits on tan_beta in the (m_A0,m_H0) plane, in the 2HDM alignment limit: | + | * Use [[http://cds.cern.ch/record/2014119]] to extract the limits on tan_beta in the (m_A0,m_H0) plane, in the 2HDM alignment limit: |

- | Excluded regions for Type I: (red -> t_beta = 0.5; blue -> t_beta = 1; orange -> t_beta = 1.5; green -> t_beta = 2) | + | The plot below shows the excluded regions for Type I (left) and Type II (right): (red -> t_beta = 0.5; blue -> t_beta = 1; orange -> t_beta = 1.5; green -> t_beta = 2) |

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+ | {{:2015:groups:higgs:morehiggs:h0toa0ztriangle.jpeg?direct&300|}} {{:2015:groups:higgs:morehiggs:h0toa0ztriangle_type2.jpeg?direct&300|}} | ||

+ | Regarding the interplay/contamination of bbH0 in the gg channel... | ||

+ | * LHC14 Prospects and interplay with bbA0 | ||

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**Literature**: | **Literature**: | ||

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+ | **__Light A/H__**: | ||

* [[http://arxiv.org/abs/1412.3385]]: A detailed analysis of the 2HDM allowed region for a light A0 (20 GeV < m_A0 < 60 GeV), both in TypeI and TypeII. It also has a discussion of detection prospects in bbA0 and gg->A0 for "aligment" and "wrong-sign" scenarios, showing that in particular for TypeII the "wrong-sign" can be completely explored with bbA0. | * [[http://arxiv.org/abs/1412.3385]]: A detailed analysis of the 2HDM allowed region for a light A0 (20 GeV < m_A0 < 60 GeV), both in TypeI and TypeII. It also has a discussion of detection prospects in bbA0 and gg->A0 for "aligment" and "wrong-sign" scenarios, showing that in particular for TypeII the "wrong-sign" can be completely explored with bbA0. | ||

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+ | **__Sizable Splitting in 2HDM and A->ZH/H->ZA__**: | ||

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* [[http://cds.cern.ch/record/2014119]]: CMS has recently carried on a search of A0 -> Z H0 / H0 -> Z A0 in ll bb, ll tautau final states. This search constraints values of tan_beta up to 4 for some (m_A0, m_H0) values with a sizable splitting. | * [[http://cds.cern.ch/record/2014119]]: CMS has recently carried on a search of A0 -> Z H0 / H0 -> Z A0 in ll bb, ll tautau final states. This search constraints values of tan_beta up to 4 for some (m_A0, m_H0) values with a sizable splitting. | ||

* [[http://arxiv.org/abs/1405.5537]]: A physical motivation for a large mass splitting m_A0 - m_H0 ~ 200-300 GeV and the search for A0 -> Z H0 at LHC is provided: this large splitting leads to a strong EW phase transition in the early universe, which could be responsible for the generation of the observed matter-antimatter asymmetry via EW baryogenesis. It also analyzes LHC14 search prospects for A0 -> Z H0 in ll bb and ll W W (W -> l nu). | * [[http://arxiv.org/abs/1405.5537]]: A physical motivation for a large mass splitting m_A0 - m_H0 ~ 200-300 GeV and the search for A0 -> Z H0 at LHC is provided: this large splitting leads to a strong EW phase transition in the early universe, which could be responsible for the generation of the observed matter-antimatter asymmetry via EW baryogenesis. It also analyzes LHC14 search prospects for A0 -> Z H0 in ll bb and ll W W (W -> l nu). | ||

* [[http://arxiv.org/abs/1404.1922]]: Detailed discussion of LHC14 search prospects for A0 -> Z H0 in both ll bb and ll Z Z, and H0 -> Z A0 in ll bb. | * [[http://arxiv.org/abs/1404.1922]]: Detailed discussion of LHC14 search prospects for A0 -> Z H0 in both ll bb and ll Z Z, and H0 -> Z A0 in ll bb. | ||

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+ | **__Constraints on 2HDM (e.g. Flavour)__**: | ||

+ | * [[http://arxiv.org/abs/1208.2788]] Bounds on m_H+ from b -> s gamma, both for Type I and Type II. They show that for Type II, the bound is particularly strong (m_H+ > 380 GeV) and tan_beta independent. | ||

2015/groups/higgs/morehiggs/largesplit.txt · Last modified: 2015/06/18 18:09 by jose_miguel.no

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