Analysis of neutron β-decay

Wilkinson, D.H.

doi:10.1016/0375-9474(82)90051-3

Cited by 300 publications

(281 citation statements)

References 22 publications

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“…In our current study we have focussed on the role of second-class current contributions, most notably on the impact of a non-zero g 2 coupling, on the ability to identify physics BSM. In the course of developing our analysis procedure, we have discovered that certain recoil effects to the neutron lifetime, contrary to the usual view [51], can have an impact on our fit results. Moreover, the precise form of the recoil corrections depends on experimental details, revealing that the corrections change with a finite experimental acceptance, such as in experiments which extract a value of the lifetime from measurements of the decay electrons and/or protons.…”

Section: Discussionmentioning

confidence: 90%

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Gardner

Plaster

2013

Phys. Rev. C

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We assess the ability of future neutron β decay measurements of up to O(10 −4 ) precision to falsify the standard model, particularly the V − A law, and to identify the dynamics beyond it. To do this, we employ a maximum likelihood statistical framework which incorporates both experimental and theoretical uncertainties. Using illustrative combined global fits to Monte Carlo pseudodata, we also quantify the importance of experimental measurements of the energy dependence of the angular correlation coefficients as input to such efforts, and we determine the precision to which ill-known "second-class" hadronic matrix elements must be determined in order to exact such tests.

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Section: Discussionmentioning

confidence: 90%

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Gardner

Plaster

2013

Phys. Rev. C

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“…ÅAEÇ f 1Y6886 ì ×ÂÍÕÑÓ ×ÂÊÑÄÑÅÑ ÒÓÑÔÕÓÂÐÔÕÄÂ; d H R 1Y466 Â 10 À2 ì ÏÑAEÇÎßÐÑ ÐÇÊÂÄËÔËÏÂâ ÄÐÇÛÐââ ÓÂAEËÂÙËÑÐÐÂâ ÒÑÒÓÂÄÍÂ, ÍÑÕÑÓÂâ ÄÞÚËÔÎâÇÕÔâ Ô ÕÑÚ-ÐÑÔÕßá 9 Â 10 À5 [2,3]; D R 2Y40 Â 10 À2 ì ÏÑAEÇÎßÐÑ ÊÂÄËÔËÏÂâ ÄÐÖÕÓÇÐÐââ ÓÂAEËÂÙËÑÐÐÂâ ÒÑÒÓÂÄÍÂ, ÍÑÕÑÓÂâ ÄÞÚËÔÎâÇÕÔâ Ô ÕÑÚÐÑÔÕßá 8 Â 10 À4 [4,5]; l ì ÑÕÐÑÛÇÐËÇ ÂÍÔËÂÎßÐÑ-ÄÇÍÕÑÓÐÑÌ Ë ÄÇÍÕÑÓÐÑÌ ÍÑÐÔÕÂÐÕ ÔÎÂÃÑÅÑ ÄÊÂËÏÑAEÇÌÔÕÄËâ, l G A aG V ; G F ì ×ÇÓÏËÇÄÔÍÂâ ÍÑÐ-ÔÕÂÐÕÂ ÔÎÂÃÑÅÑ ÄÊÂËÏÑAEÇÌÔÕÄËâ, ÑÒÓÇAEÇÎâÇÏÂâ ËÊ m-ÓÂÔÒÂAEÂ; K " h2p 3 ln 2" hc 6 am e c 2 5 . ³ÄÑAEÐÂâ ×ÑÓÏÖÎÂ AEÎâ ÄÞÚËÔÎÇÐËâ jV ud j 2 ËÊ ÐÇÌÕÓÑÐ-ÐÑÅÑ b-ÓÂÔÒÂAEÂ ËÏÇÇÕ ÄËAE [1,3] jV ud j 2 4908 AE 4 s t n 1 3l 2 Y 1X3…”

Section: £äçAeçðëçunclassified

Neutron lifetime measurements using gravitationally trapped ultracold neutrons

Serebrov¹

2005

Usp. Fiz. Nauk

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ÇÒÇÓß ÏÑÉÐÑ ÒÇÓÇÒËÔÂÕß ÒÓÂÄÖá ÚÂÔÕß ×ÑÓÏÖÎÞ (3.3) Ä ÄËAEÇ ÒÓÑËÊÄÇAEÇÐËâ AEÄÖØ ÔÑÏÐÑÉËÕÇÎÇÌ, ÑAEËÐ ËÊ ÍÑÕÑÓÞØ ÊÂÄËÔËÕ ÕÑÎßÍÑ ÑÕ àÐÇÓÅËË µ·¯, Â AEÓÖÅÑÌ ì ÕÑÎßÍÑ ÑÕ ÕÇÏÒÇÓÂÕÖÓÞ ÎÑÄÖÛÍË: ÎÑÄÖÛÇÍ Ô ÄÓÇÏÇÐÂÏË ØÓÂÐÇÐËâ t 1 Ë t 2 : ÅAEÇ r ÇÔÕß ÒÎÑÕÐÑÔÕß âAEÇÓ Ä ÇAEËÐËÙÇ ÑÃÝÇÏÂ. ®ÐËÏÂâ ÚÂÔÕß ÒÑÕÇÐÙËÂÎÂ ÑÒËÔÞÄÂÇÕ ÊÂØÄÂÕ Ë ÐÇÖÒÓÖÅÑÇ ÓÂÔÔÇâ-ÐËÇ.´ËÒËÚÐÞÇ ÊÐÂÚÇÐËâ ÄÇÎËÚËÐÞ ÒÑÕÇÐÙËÂÎÂ: U % 10 À7 à£, jWaUj % 10 À4 . £ ÔÎÖÚÂÇ E 0 b U Ä ÄÇÜÇÔÕÄÇ ÓÂÔÒÓÑÔÕÓÂÐâÇÕÔâ ÑÃÞÚ-ÐÂâ ÒÎÑÔÍÂâ ÄÑÎÐÂ expikz Ô ÄÑÎÐÑÄÞÏ ÄÇÍÕÑÓÑÏ:£ ÔÎÖÚÂÇ E 0`U Ä ÄÇÜÇÔÕÄÇ ÓÂÔÒÓÑÔÕÓÂÐâÇÕÔâ ÊÂÕÖ-ØÂáÜÂâ ÄÑÎÐÂ expÀKz Ô ÄÑÎÐÑÄÞÏ ÄÇÍÕÑÓÑÏ:ÅAEÇ Z Im baRe b. ªÔÒÑÎßÊÖâ ÑÒÕËÚÇÔÍÖá ÕÇÑÓÇÏÖ s tot 4p Im bak 0 , ÔÑÑÕÐÑÛÇÐËÇ (5.2) ÏÑÉÐÑ ÒÓËÄÇÔÕË Í ÔÎÇAEÖáÜÇÏÖ ÄËAEÖ: ¥Îâ ÒÑÎÐÑÅÑ ÔÇÚÇÐËâ ÒÓË E 0 b U ÏÞ ÒÑÎÖÚÂÇÏ AEÑÔÕÂÕÑÚÐÑ ÑÚÇÄËAEÐÞÌ ÓÇÊÖÎßÕÂÕ: ²ËÔ. 14. Neutron lifetime measurement using gravitationally trapped ultracold neutrons A.P. Serebrov B.P. Konstantinov Petersburg Nuclear Physics Institute, Russian Academy of Sciences, 188300 Gatchina, Leningrad Region, Russian Federation Tel. (7-81371) 4-60 01 E-mail: serebrov@pnpi.spb.ru Experiments using gravitationally trapped ultracold neutrons (UCN) to measure the neutron lifetime are reviewed. The exact value of the neutron lifetime is of fundamental importance to particle physics and cosmology. In our experiment, the UCN storage time is brought closest ever to the neutron lifetime; the probability of UCN loss from the trap was only 1% of that for neutron beta decay. The neutron lifetime obtained, 878X5 AE 0X7 stat AE 0X3 sys s, is the most accurate one to date. The impact of the new result on testing the unitarity of the quark mixing matrix and on data analysis for the primordial nucleosynthesis model is reviewed.

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“…Though these two expressions capture the essence of how δm np enters into these rates there are a number of corrections that must be taken into account before the n ↔ p reaction rates reach sufficient accuracy [17,18,19] given the accuracy of the data we will eventually use in our constraints.…”

Section: Nuclear Reaction Rates and λQcdmentioning

confidence: 99%

Big bang nucleosynthesis andΛQCD

Kneller

McLaughlin

2003

Phys. Rev. D

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Big Bang Nucleosynthesis (BBN) has increasingly become the tool of choice for investigating the permitted variation of fundamental constants during the earliest epochs of the Universe. Here we present a BBN calculation that has been modified to permit changes in the QCD scale, ΛQCD. The primary effects of changing the QCD scale upon BBN are through the deuteron binding energy, BD, and the neutron-proton mass difference, δmnp, which both play crucial roles in determining the primordial abundances. In this paper, we show how a simplified BBN calculation allows us to restrict the nuclear data we need to just BD and δmnp yet still gives useful results so that any variation in ΛQCD may be constrained via the corresponding shifts in BD and δmnp by using the current estimates of the primordial deuterium abundance and helium mass fraction. The simplification predicts the helium-4 and deuterium abundances to within 1% and 50% respectively when compared with the results of a standard BBN code. But ΛQCD also affects much of remaining required nuclear input so this method introduces a systematic error into the calculation and we find a degeneracy between BD and δmnp. We show how increased understanding of the relationship of the pion mass and/or BD to other nuclear parameters, such as the binding energy of tritium and the cross section of T + D → 4 He + n, would yield constraints upon any change in BD and δmnp at the 10% level.PACS numbers: 99.99

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Analysis of neutron β-decay

Cited by 300 publications

References 22 publications

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Neutron lifetime measurements using gravitationally trapped ultracold neutrons

Big bang nucleosynthesis andΛQCD

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