Precision Higgs Constraints in U(1) Extensions of the Standard Model with a Light <i>Z</i>′-Boson
Anomaly-free <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>U</mi><mo>(</mo><mn>1</mn><mo>)</mo></mrow></semantics></math></inline-...
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| author | Zoltán Péli Zoltán Trócsányi |
| author_facet | Zoltán Péli Zoltán Trócsányi |
| author_sort | Zoltán Péli |
| collection | DOAJ |
| description | Anomaly-free <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>U</mi><mo>(</mo><mn>1</mn><mo>)</mo></mrow></semantics></math></inline-formula> extensions of the standard model (SM) predict a new neutral gauge boson <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>Z</mi><mo>′</mo></msup></semantics></math></inline-formula>. When <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>Z</mi><mo>′</mo></msup></semantics></math></inline-formula> obtains its mass from the spontaneous breaking of the new <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>U</mi><mo>(</mo><mn>1</mn><mo>)</mo></mrow></semantics></math></inline-formula> symmetry by a new complex scalar field, the model also predicts a second real scalar <i>s</i>, and the search for the new scalar and the search for the new gauge boson become intertwined. We present the computation of production cross sections and decay widths of such a scalar <i>s</i> in models with a light <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>Z</mi><mo>′</mo></msup></semantics></math></inline-formula> boson when the decay <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>h</mi><mo>→</mo><msup><mi>Z</mi><mo>′</mo></msup><msup><mi>Z</mi><mo>′</mo></msup></mrow></semantics></math></inline-formula> may have a sizeable branching ratio. We show how the Higgs signal strength measurement in this channel can provide stricter exclusion bounds on the parameters of the model than those obtained from the total signal strength for Higgs boson production. |
| format | Article |
| id | doaj-art-bb6c22a80951436f85d64f4ac079ff6d |
| institution | Kabale University |
| issn | 2218-1997 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj-art-bb6c22a80951436f85d64f4ac079ff6d2025-01-24T13:51:28ZengMDPI AGUniverse2218-19972025-01-011111210.3390/universe11010012Precision Higgs Constraints in U(1) Extensions of the Standard Model with a Light <i>Z</i>′-BosonZoltán Péli0Zoltán Trócsányi1Institute for Theoretical Physics, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/A, 1117 Budapest, HungaryInstitute for Theoretical Physics, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/A, 1117 Budapest, HungaryAnomaly-free <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>U</mi><mo>(</mo><mn>1</mn><mo>)</mo></mrow></semantics></math></inline-formula> extensions of the standard model (SM) predict a new neutral gauge boson <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>Z</mi><mo>′</mo></msup></semantics></math></inline-formula>. When <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>Z</mi><mo>′</mo></msup></semantics></math></inline-formula> obtains its mass from the spontaneous breaking of the new <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>U</mi><mo>(</mo><mn>1</mn><mo>)</mo></mrow></semantics></math></inline-formula> symmetry by a new complex scalar field, the model also predicts a second real scalar <i>s</i>, and the search for the new scalar and the search for the new gauge boson become intertwined. We present the computation of production cross sections and decay widths of such a scalar <i>s</i> in models with a light <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>Z</mi><mo>′</mo></msup></semantics></math></inline-formula> boson when the decay <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>h</mi><mo>→</mo><msup><mi>Z</mi><mo>′</mo></msup><msup><mi>Z</mi><mo>′</mo></msup></mrow></semantics></math></inline-formula> may have a sizeable branching ratio. We show how the Higgs signal strength measurement in this channel can provide stricter exclusion bounds on the parameters of the model than those obtained from the total signal strength for Higgs boson production.https://www.mdpi.com/2218-1997/11/1/12beyond the standard modelsuperweak extensionnew neutral gauge bosonscalar searchexclusion limits |
| spellingShingle | Zoltán Péli Zoltán Trócsányi Precision Higgs Constraints in U(1) Extensions of the Standard Model with a Light <i>Z</i>′-Boson Universe beyond the standard model superweak extension new neutral gauge boson scalar search exclusion limits |
| title | Precision Higgs Constraints in U(1) Extensions of the Standard Model with a Light <i>Z</i>′-Boson |
| title_full | Precision Higgs Constraints in U(1) Extensions of the Standard Model with a Light <i>Z</i>′-Boson |
| title_fullStr | Precision Higgs Constraints in U(1) Extensions of the Standard Model with a Light <i>Z</i>′-Boson |
| title_full_unstemmed | Precision Higgs Constraints in U(1) Extensions of the Standard Model with a Light <i>Z</i>′-Boson |
| title_short | Precision Higgs Constraints in U(1) Extensions of the Standard Model with a Light <i>Z</i>′-Boson |
| title_sort | precision higgs constraints in u 1 extensions of the standard model with a light i z i boson |
| topic | beyond the standard model superweak extension new neutral gauge boson scalar search exclusion limits |
| url | https://www.mdpi.com/2218-1997/11/1/12 |
| work_keys_str_mv | AT zoltanpeli precisionhiggsconstraintsinu1extensionsofthestandardmodelwithalightiziboson AT zoltantrocsanyi precisionhiggsconstraintsinu1extensionsofthestandardmodelwithalightiziboson |