First Full Dalitz Plot Measurement in Neutron $β$-Decay using the Nab Spectrometer and Implications for New Physics
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| Format: | Preprint |
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2025
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| author | Gonzalez, Francisco M. Choi, Jin Ha Acharya, Himal Clymer, Skylar Hagemeier, Andrew Mathews, David G. Mendelsohn, August Nelsen, Austin Rahangdale, Hitesh Richburg, Love Alarcon, Ricardo Atencio, Ariella Baeßler, Stefan Bailey, Thomas Birge, Noah Borissenko, Dennis Bowler, Michael Broussard, Leah J. Bryant, Albert T. Caylor, Jimmy Chupp, Tim Crawford, Christopher Croley, R. Alston Cruz, Micah Dodson, George Fan, Wenjiang Fellers, Deion Fomin, Nadia Frlež, Emil Frost, Matthew Fry, Jason Fuehne, Duncan Gericke, Michael T. Gervais, Michelle Gilbert, Corey Glück, Ferenc Godri, Rebecca Greene, Geoff L. Greene, William Hamblen, Josh Harmston, Paul Hayen, Leendert Hedinger, Carter Hendrus, Chelsea Hollander, Sean Imam, Kavish Iverson, Erik B. Jezghani, Aaron Jiang, Chenyang Li, Huangxing Macsai, Nick Makela, Mark Mammei, Russell Marshall, Ricky Martinez, Madelyn McCrea, Mark McGaughey, Pat McGovern, Sean McLaughlin, David Mirabal-Martinez, Jacqueline Mueller, Paul Mullins, Andrew Musk, William O'Kronley, Jordan Penttilä, Seppo I. Perryman, D. Elliot Pierce, Josh Pioquinto, Jason A. Počanić, Dinko Presley, Hunter Ramsey, John Randall, Glenn Raney, Zachary Ricketts, Jackson Riley, Grant Salas-Bacci, Americo Samiei, Sepehr Saunders, Alexander Schreyer, Wolfgang Scott, E. Mae Shelton, Thomas Singh, Aryaman Smith, Alexander Smith, Erick Stevens, Eric Taylor, R. J. Tinius, Leonard Wallace, Isaiah Wexler, Jonathan Wilburn, W. Scott Young, A. R. Zeck, B. |
| author_facet | Gonzalez, Francisco M. Choi, Jin Ha Acharya, Himal Clymer, Skylar Hagemeier, Andrew Mathews, David G. Mendelsohn, August Nelsen, Austin Rahangdale, Hitesh Richburg, Love Alarcon, Ricardo Atencio, Ariella Baeßler, Stefan Bailey, Thomas Birge, Noah Borissenko, Dennis Bowler, Michael Broussard, Leah J. Bryant, Albert T. Caylor, Jimmy Chupp, Tim Crawford, Christopher Croley, R. Alston Cruz, Micah Dodson, George Fan, Wenjiang Fellers, Deion Fomin, Nadia Frlež, Emil Frost, Matthew Fry, Jason Fuehne, Duncan Gericke, Michael T. Gervais, Michelle Gilbert, Corey Glück, Ferenc Godri, Rebecca Greene, Geoff L. Greene, William Hamblen, Josh Harmston, Paul Hayen, Leendert Hedinger, Carter Hendrus, Chelsea Hollander, Sean Imam, Kavish Iverson, Erik B. Jezghani, Aaron Jiang, Chenyang Li, Huangxing Macsai, Nick Makela, Mark Mammei, Russell Marshall, Ricky Martinez, Madelyn McCrea, Mark McGaughey, Pat McGovern, Sean McLaughlin, David Mirabal-Martinez, Jacqueline Mueller, Paul Mullins, Andrew Musk, William O'Kronley, Jordan Penttilä, Seppo I. Perryman, D. Elliot Pierce, Josh Pioquinto, Jason A. Počanić, Dinko Presley, Hunter Ramsey, John Randall, Glenn Raney, Zachary Ricketts, Jackson Riley, Grant Salas-Bacci, Americo Samiei, Sepehr Saunders, Alexander Schreyer, Wolfgang Scott, E. Mae Shelton, Thomas Singh, Aryaman Smith, Alexander Smith, Erick Stevens, Eric Taylor, R. J. Tinius, Leonard Wallace, Isaiah Wexler, Jonathan Wilburn, W. Scott Young, A. R. Zeck, B. |
| contents | Precision measurements of observables in neutron $β$-decay are used to test the Standard Model description of the weak interaction and search for evidence of new physics. The Nab experiment at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source was constructed to measure correlations in neutron decay by utilizing an asymmetric spectrometer and novel detection system to accurately reconstruct the proton momentum and electron energy for each $β$-decay. This work describes the detection of neutron $β$-decay products in the Nab spectrometer and presents the first full Dalitz plot representation of the phase space of neutron $β$-decay for all electrons >100 keV. In addition, new constraints are placed on a possible excited neutron state, hypothesized to explain the disagreement between the appearance and disappearance neutron lifetime techniques. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_16045 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | First Full Dalitz Plot Measurement in Neutron $β$-Decay using the Nab Spectrometer and Implications for New Physics Gonzalez, Francisco M. Choi, Jin Ha Acharya, Himal Clymer, Skylar Hagemeier, Andrew Mathews, David G. Mendelsohn, August Nelsen, Austin Rahangdale, Hitesh Richburg, Love Alarcon, Ricardo Atencio, Ariella Baeßler, Stefan Bailey, Thomas Birge, Noah Borissenko, Dennis Bowler, Michael Broussard, Leah J. Bryant, Albert T. Caylor, Jimmy Chupp, Tim Crawford, Christopher Croley, R. Alston Cruz, Micah Dodson, George Fan, Wenjiang Fellers, Deion Fomin, Nadia Frlež, Emil Frost, Matthew Fry, Jason Fuehne, Duncan Gericke, Michael T. Gervais, Michelle Gilbert, Corey Glück, Ferenc Godri, Rebecca Greene, Geoff L. Greene, William Hamblen, Josh Harmston, Paul Hayen, Leendert Hedinger, Carter Hendrus, Chelsea Hollander, Sean Imam, Kavish Iverson, Erik B. Jezghani, Aaron Jiang, Chenyang Li, Huangxing Macsai, Nick Makela, Mark Mammei, Russell Marshall, Ricky Martinez, Madelyn McCrea, Mark McGaughey, Pat McGovern, Sean McLaughlin, David Mirabal-Martinez, Jacqueline Mueller, Paul Mullins, Andrew Musk, William O'Kronley, Jordan Penttilä, Seppo I. Perryman, D. Elliot Pierce, Josh Pioquinto, Jason A. Počanić, Dinko Presley, Hunter Ramsey, John Randall, Glenn Raney, Zachary Ricketts, Jackson Riley, Grant Salas-Bacci, Americo Samiei, Sepehr Saunders, Alexander Schreyer, Wolfgang Scott, E. Mae Shelton, Thomas Singh, Aryaman Smith, Alexander Smith, Erick Stevens, Eric Taylor, R. J. Tinius, Leonard Wallace, Isaiah Wexler, Jonathan Wilburn, W. Scott Young, A. R. Zeck, B. Nuclear Experiment High Energy Physics - Experiment Precision measurements of observables in neutron $β$-decay are used to test the Standard Model description of the weak interaction and search for evidence of new physics. The Nab experiment at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source was constructed to measure correlations in neutron decay by utilizing an asymmetric spectrometer and novel detection system to accurately reconstruct the proton momentum and electron energy for each $β$-decay. This work describes the detection of neutron $β$-decay products in the Nab spectrometer and presents the first full Dalitz plot representation of the phase space of neutron $β$-decay for all electrons >100 keV. In addition, new constraints are placed on a possible excited neutron state, hypothesized to explain the disagreement between the appearance and disappearance neutron lifetime techniques. |
| title | First Full Dalitz Plot Measurement in Neutron $β$-Decay using the Nab Spectrometer and Implications for New Physics |
| topic | Nuclear Experiment High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2508.16045 |