Search for Dark Photons from Neutral Meson Decays in [math][mi]p[/mi][mo]+[/mo][mi]p[/mi][/math] and [math][mi]d[/mi][mo]+[/mo][mi Mathvariant PDF Download
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Languages : en
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The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment (g-2)[mu] deviates from SM calculations by 3.6[sigma]. Several theoretical models attribute this to the existence of a "dark photon," an additional U(1) gauge boson, which is weakly coupled to ordinary photons. For this study, the PHENIX experiment at the Relativistic Heavy Ion Collider has searched for a dark photon, U, in [pi]0, [eta]2!gamma]e+e- decays and obtained upper limits of [theta](2×10-6) on U-[gamma] mixing at 90% C.L. for the mass range 30
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Languages : en
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Book Description
The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment (g-2)[mu] deviates from SM calculations by 3.6[sigma]. Several theoretical models attribute this to the existence of a "dark photon," an additional U(1) gauge boson, which is weakly coupled to ordinary photons. For this study, the PHENIX experiment at the Relativistic Heavy Ion Collider has searched for a dark photon, U, in [pi]0, [eta]2!gamma]e+e- decays and obtained upper limits of [theta](2×10-6) on U-[gamma] mixing at 90% C.L. for the mass range 30
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Languages : en
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Book Description
The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment (g-2)? deviates from SM calculations by 3.6?. Several theoretical models attribute this to the existence of a ?dark photon,? an additional U(1) gauge boson, which is weakly coupled to ordinary photons. For this study, the PHENIX experiment at the Relativistic Heavy Ion Collider has searched for a dark photon, U, in ?0,?????????e+e- decays and obtained upper limits of ?(2×10-6) on U-? mixing at 90% C.L. for the mass range 30msubU/sub90 MeV/csup2/sup. Lastly, combined with other experimental limits, the remaining region in the U-? mixing parameter space that can explain the (g-2)sub?/sub deviation from its SM value is nearly completely excluded at the 90% confidence level, with only a small region of 29msubU
Author: Marco Fabbrichesi
Publisher: Springer Nature
ISBN: 3030625192
Category : Science
Languages : en
Pages : 85
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Book Description
This book is about the dark photon which is a new gauge boson whose existence has been conjectured. Due to its interaction with the ordinary, visible photon, such a particle can be experimentally detected via specific signatures. In this book, the authors review the physics of the dark photon from the theoretical and experimental point of view. They discuss the difference between the massive and the massless case, highlighting how the two phenomena arise from the same vector portal between the dark and the visible sector. A review of the cosmological and astrophysical observations is provided, together with the connection to dark matter physics. Then, a perspective on current and future experimental limits on the parameters of the massless and massive dark photon is given, as well as the related bounds on milli-charged fermions. The book is intended for graduate students and young researchers who are embarking on dark photon research, and offers them a clear and up-to-date introduction to the subject.
![Search for the Dark Photon in [pi]0 Decays PDF](https://books.google.com/books/content/images/frontcover/z6pfswEACAAJ?fife=w80-h100)
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Languages : en
Pages : 8
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A sample of 1.69 × 107 fully reconstructed [pi]0 2![gamma]e+e- decay candidates collected by the NA48/2 experiment at CERN in 2003-2004 is analyzed to search for the dark photon (A') production in the [pi]02!gamma]A' decay followed by the prompt A' 2!e+e- decay. No signal is observed, and an exclusion region in the plane of the dark photon mass mA' and mixing parameter [epsilon]2 is established. The obtained upper limits on [epsilon]2 are more stringent than the previous limits in the mass range 9 MeV/c2
Author: M. I. Dobroliubov
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Languages : en
Pages :
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Author: Marco Fabbrichesi
Publisher:
ISBN: 9783030625207
Category :
Languages : en
Pages : 0
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Book Description
This book is about the dark photon which is a new gauge boson whose existence has been conjectured. Due to its interaction with the ordinary, visible photon, such a particle can be experimentally detected via specific signatures. In this book, the authors review the physics of the dark photon from the theoretical and experimental point of view. They discuss the difference between the massive and the massless case, highlighting how the two phenomena arise from the same vector portal between the dark and the visible sector. A review of the cosmological and astrophysical observations is provided, together with the connection to dark matter physics. Then, a perspective on current and future experimental limits on the parameters of the massless and massive dark photon is given, as well as the related bounds on milli-charged fermions. The book is intended for graduate students and young researchers who are embarking on dark photon research, and offers them a clear and up-to-date introduction to the subject.
