Probing the seesaw mechanism at the 250 GeV ILC
We consider a gauged U(1)B−L (Baryon-minus-Lepton number) extension of the Standard Model (SM), which is anomaly-free in the presence of three Right-Handed Neutrinos (RHNs). Associated with the U(1)B−L symmetry breaking the RHNs acquire their Majorana masses and then play the crucial role to generat...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-10-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269319305635 |
| _version_ | 1811198730525736960 |
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| author | Arindam Das Nobuchika Okada Satomi Okada Digesh Raut |
| author_facet | Arindam Das Nobuchika Okada Satomi Okada Digesh Raut |
| author_sort | Arindam Das |
| collection | DOAJ |
| description | We consider a gauged U(1)B−L (Baryon-minus-Lepton number) extension of the Standard Model (SM), which is anomaly-free in the presence of three Right-Handed Neutrinos (RHNs). Associated with the U(1)B−L symmetry breaking the RHNs acquire their Majorana masses and then play the crucial role to generate the neutrino mass matrix by the seesaw mechanism. Towards the experimental confirmation of the seesaw mechanism, we investigate a RHN pair production through the U(1)B−L gauge boson (Z′) at the 250 GeV International Linear Collider (ILC). The Z′ gauge boson has been searched at the Large Hadron Collider (LHC) Run-2 and its production cross section is already severely constrained. The constraint will become more stringent by the future experiments with the High-Luminosity upgrade of the LHC (HL-LHC). We find a possibility that even after a null Z′ boson search result at the HL-LHC, the 250 GeV ILC can search for the RHN pair production through the final state with same-sign dileptons plus jets, which is a “smoking-gun” signature from the Majorana nature of RHNs. In addition, some of RHNs are long-lived and leave a clean signature with a displaced vertex. Therefore, the 250 GeV ILC can operate as not only a Higgs Factory but also a RHN discovery machine to explore the origin of the Majorana neutrino mass generation, namely the seesaw mechanism. |
| first_indexed | 2024-04-12T01:36:05Z |
| format | Article |
| id | doaj.art-55abc917773844488dbb4ad29c1da173 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-04-12T01:36:05Z |
| publishDate | 2019-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-55abc917773844488dbb4ad29c1da1732022-12-22T03:53:19ZengElsevierPhysics Letters B0370-26932019-10-01797Probing the seesaw mechanism at the 250 GeV ILCArindam Das0Nobuchika Okada1Satomi Okada2Digesh Raut3Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan; Corresponding author.Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35487, USADepartment of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35487, USABartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USAWe consider a gauged U(1)B−L (Baryon-minus-Lepton number) extension of the Standard Model (SM), which is anomaly-free in the presence of three Right-Handed Neutrinos (RHNs). Associated with the U(1)B−L symmetry breaking the RHNs acquire their Majorana masses and then play the crucial role to generate the neutrino mass matrix by the seesaw mechanism. Towards the experimental confirmation of the seesaw mechanism, we investigate a RHN pair production through the U(1)B−L gauge boson (Z′) at the 250 GeV International Linear Collider (ILC). The Z′ gauge boson has been searched at the Large Hadron Collider (LHC) Run-2 and its production cross section is already severely constrained. The constraint will become more stringent by the future experiments with the High-Luminosity upgrade of the LHC (HL-LHC). We find a possibility that even after a null Z′ boson search result at the HL-LHC, the 250 GeV ILC can search for the RHN pair production through the final state with same-sign dileptons plus jets, which is a “smoking-gun” signature from the Majorana nature of RHNs. In addition, some of RHNs are long-lived and leave a clean signature with a displaced vertex. Therefore, the 250 GeV ILC can operate as not only a Higgs Factory but also a RHN discovery machine to explore the origin of the Majorana neutrino mass generation, namely the seesaw mechanism.http://www.sciencedirect.com/science/article/pii/S0370269319305635 |
| spellingShingle | Arindam Das Nobuchika Okada Satomi Okada Digesh Raut Probing the seesaw mechanism at the 250 GeV ILC Physics Letters B |
| title | Probing the seesaw mechanism at the 250 GeV ILC |
| title_full | Probing the seesaw mechanism at the 250 GeV ILC |
| title_fullStr | Probing the seesaw mechanism at the 250 GeV ILC |
| title_full_unstemmed | Probing the seesaw mechanism at the 250 GeV ILC |
| title_short | Probing the seesaw mechanism at the 250 GeV ILC |
| title_sort | probing the seesaw mechanism at the 250 gev ilc |
| url | http://www.sciencedirect.com/science/article/pii/S0370269319305635 |
| work_keys_str_mv | AT arindamdas probingtheseesawmechanismatthe250gevilc AT nobuchikaokada probingtheseesawmechanismatthe250gevilc AT satomiokada probingtheseesawmechanismatthe250gevilc AT digeshraut probingtheseesawmechanismatthe250gevilc |