Presentation is loading. Please wait.

Presentation is loading. Please wait.

The MuCap experiment – final results on μp capture rate Λ S and pseudoscalar coupling g P INPC 2013 Firence Italia June 2 - 7, 2013 Claude Petitjean on.

Published byBartholomew Smith Modified over 7 years ago

Similar presentations

Presentation on theme: "The MuCap experiment – final results on μp capture rate Λ S and pseudoscalar coupling g P INPC 2013 Firence Italia June 2 - 7, 2013 Claude Petitjean on."— Presentation transcript:

1 the MuCap experiment – final results on μp capture rate Λ S and pseudoscalar coupling g P INPC 2013 Firence Italia June 2 - 7, 2013 Claude Petitjean on behalf of the MuCap-collaboration cut out view of MuCap detector http://muon.npl.washington.edu/exp/MuCap/ Petitjean INPC 2013 Firence June 2-7

2 outline - goal of MuCap - experimental strategy - lifetime method – TPC – exp. setup - systematics: - impurities - pμp molecules – the ortho-para problem - systematic corrections - final results: - singlet capture rate Λ S - induced pseudoscalar coupling constant g P Petitjean INPC 2013 Firence June 2-7

3 precision measurement of singlet μp capture μ - + p  μ + n rate Λ s tests basic QCD symmetries: formfactors g A, g P of these g P is of particular interest because only μp capture is sensitive to it while g A can be determined from neutron decay a 1% measurement of Λ S determines g P exp to 6% MuCap’s scientific goal solid prediction by chiral perturbation theory (V. Bernard et al. 1994): g P theory = 8.26  0.23 Petitjean INPC 2013 Firence June 2-7

4 strategy of MuCap experiment 4 requirements solutions _________________________________________ precision technique lifetime method clear interpretation low density H 2 gas (Φ ~ 1%) ortho-para problem of ppμ clean μ stops time projection chamber TPC high purity H 2 gas UHV materials & continuous c Z < 10 -8 gas circulation + cleaning isotopically clean H 2 isotope separation „ protium“ with c D < 10 -8 column  high statistics muon kicker ≥ 10 10 single events Petitjean INPC 2013 Firence June 2-7

5 -μp  nν μ rare process 0.16% of μ  eν μ ν e –direct neutron detection not precise enough  lifetime method: μp capture rate Λ S = difference of μ slopes for a 1% result measure λ (μ - p) to 10 -5 [ λ (μ + ) to 10 -6 from MuLan-exp] lifetime method Λ S = λ (μ - p) – λ (μ + ) we have collected 1.2 10 10 single μ - decays Petitjean INPC 2013 Firence June 2-7

6 ~ 5 liters sensitive volume filled with 10 bar protium gas is continuously cycled and cleaned 2 kV/cm vertical drift field (v d ~ 5.5 mm/μs) 2-D horizontal readout on 75 anode and 140 cathode wires (5-6 kV) UHV technique using metals/glass frames/ ceramic materials bakeable to 130 C the Hydrogen TPC as active μ stop target full 3-D reconstruction of every μ-stop event Petitjean SPS June 21 2012 at ETHZ

7 the MuCap detector with TPC vessel out Petitjean INPC 2013 Firence June 2-7

8 MuCap event μ - → e ν μ ν e Petitjean INPC 2013 Firence June 2-7

9 impurities removed with continuous gas cycling - cryogenic adsorption/desorption cycles using active Carbon - Zeolite at 80K absorbs all Z>2 impurities H 2 O c~17ppb N 2 c ~5ppb gas chromatography humidity sensor Petitjean INPC 2013 Firenze June 2-7 event display showing recoil after μ-capture by impurity purification system we achieved c Z < 2 x 10 -8 impurities in the H 2 gas

10 : systematics: the ortho – para problem pμp formation makes interpretation of λ observed difficult 10 Λ S = 715 s -1 Λ T = 12 s -1 Λ ortho = 543 s -1 Λ para = 215 s -1 the problem: - strong sensitivity to H 2 density Φ - in lq. H 2 (Φ=1) fast pμp formation but λ op is largely unknown solution: use low H 2 density Φ ~ 0.01 (  only 2.5% correction to Λ S ) we have remeasured the pμp formation rate: λ pp = 1.94(6) 10 6 s -1 Petitjean INPC 2013 Firence June 2-7

11 lifetime fit of full statistics (run11) thesis B. Kiburg Petitjean INPC 2013 Firence June 2-7

12 MuCap‘s lifetime results 12 rates with secret offset Petitjean INPC 2013 Firence June 2-7

13 lifetime results after unblinding Petitjean INPC 2013 Firence June 2-7 analysis of each run was done „blind“

14 (old) run-2004 PR Lett. 99, 032002 (2007) run-2006run-2007 remarks statistics1.6 x 10 9 5.5 x 10 9 5.0 x 10 9 events after cuts μ- fit 455‘883.5 ± 12.5456‘538.00 ± 7.05 ± 7.73 457‘071.35 ± 7.58 ± 8.34 stat errors inflated due to Χ 2 sys corr -32.1 ± 8.4 -23.30 ± 5.20 -14.74 ± 3.88 systematic errors μ- corr 455‘851.4 ± 15.1455‘857.3 ± 9.3455‘853.1 ± 9.1unblinded, full errors μ+ 455‘170.05 ± 0.46 PR Lett. 106, 041803 (2011) MuLan result ΔΛ pμp +19.80 ± 1.87 +17.73 ± 1.87+17.72 ± 1.87pμp formation Δ μp +12.3 PR 119(1), 365 (1960) bound state effect ΛSΛS 713.45 ± 15.2 s -1 717.3 ± 9.5 s -1 713.1 ± 9.4 s -1 Λ S MuCap = μ- - μ+ +Δ μp +ΔΛ pμp 714.9 ± 7.4 s -1 (±5.4 stat ±5.0 sys ) our final result see PR Lett 110, 012504 (2013) 712.7 ± 4.3 s -1 theory μp lifetimes μ & final capture rate Λ S Petitjean INPC 2013 Firence June 2-7

15 the induced pseudoscalar coupling constant g P from Λ S th (g A,g P ) = (712.7 ± 4.3) x [1 + 0.6265 (g A -g A PDG ) - 0.0108 (g P -g P PDG )] A. Czarnecki, W.J. Marciano, A. Shirlin, PRL 99, 032003 (2007) we deduce g P MuCap = 8.06 ± 0.48 exp ± 0.28 th excellent agreement with chiral perturbation theory!  Petitjean INPC 2013 Firence June 2-7

16 g P (MuCap) = 8.04 ± 0.48 g P (theory) = 8.26 ± 0.23 our precise & unambiguous result solves longstanding puzzle! Petitjean INPC 2013 Firence June 2-7

17 V.A. Andreev, T.I. Banks, R.M. Carey, T.A. Case, S.M. Clayton, K.M. Crowe, J. Deutsch, J. Egger, S.J. Freedman, V.A. Ganzha, T. Gorringe, F.E. Gray, D.W. Hertzog, M. Hildebrandt, P. Kammel, B. Kiburg, S. Knaak, P.A. Kravtsov, A.G. Krivshich, B. Lauss, K.R. Lynch, E.M. Maev, O.E. Maev, F. Mulhauser, C. Petitjean, G.E. Petrov, R. Prieels, G.N. Schapkin, G.G. Semenchuk, M.A. Soroka, V. Tishchenko, A.A. Vasilyev, A.A. Vorobyov, M.E. Vznuzdaev, P. Winter the MuCap collaboration & authors of Phys. Rev. Lett. 110, 012504 (2013) Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia Paul Scherrer Institute (PSI), Villigen, Switzerland University of California, Berkeley CA (UCB) and LBNL, USA University of Illinois at Urbana-Champaign IL (UIUC), USA University of Washington (UW), Seattle WA, USA Université Catholique de Louvain, Louvain-la-Neuve, Belgium University of Kentucky, Lexington KY, USA Boston University, Boston MA,USA parts of the collaboration after one of the main runs at PSI (graduate students in red) Petitjean INPC 2013 Firence June 2-7

18 MuCap systematic error budget Systematic errorsRun 2006Run 2007 (s -1 )  (s -1 ) (s -1 )  (s -1 ) high-Z impurities-7.81.87-4.540.93 μp scatter-12.43.22-7.201.25 μp diffusion-3.10.1-3.00.1 fiducial volume cut3.0 entrance counter inefficiencies 0.5 choice of electron detector definitions 1.8 total-23.35.1-14.73.9 Petitjean INPC 2013 Firence June 2-7

Download ppt "The MuCap experiment – final results on μp capture rate Λ S and pseudoscalar coupling g P INPC 2013 Firence Italia June 2 - 7, 2013 Claude Petitjean on."

Similar presentations

Zijin Guo University of Hawaii (Representing BES Collaboration) Quarkonium Working Group ’04, IHEP Beijing October 13, 2004 Study of  c Decays at BES.

Zijin Guo University of Hawaii (Representing BES Collaboration) Quarkonium Working Group ’04, IHEP Beijing October 13, 2004 Study of  c Decays at BES.
A.Vorobyov on behalf of MuCap collaboration Determination of the nucleon’s pseudoscalar form factor in the MuCap experiment HSQCD 2014 Gatchina 30.06.2014.

A.Vorobyov on behalf of MuCap collaboration Determination of the nucleon’s pseudoscalar form factor in the MuCap experiment HSQCD 2014 Gatchina
Muon Capture on the Proton Final results from the MuCap experiment Muon Capture on the Proton Final results from the MuCap experiment gPgP Peter Winter.

Muon Capture on the Proton Final results from the MuCap experiment Muon Capture on the Proton Final results from the MuCap experiment gPgP Peter Winter.
First measurement of kaonic hydrogen and nitrogen X-rays at DA  NE J. Zmeskal Institute for Medium Energy Physics, Vienna for the DEAR Collaboration LNF.

First measurement of kaonic hydrogen and nitrogen X-rays at DA  NE J. Zmeskal Institute for Medium Energy Physics, Vienna for the DEAR Collaboration LNF.
UHV and Surface Science Perspectives on the Purification of Liquid Argon for Large TPC Detectors A. L. Johnson Department of Chemistry University of Nevada,

UHV and Surface Science Perspectives on the Purification of Liquid Argon for Large TPC Detectors A. L. Johnson Department of Chemistry University of Nevada,
Precision Measurement of Muon Capture on the Proton “  Cap experiment”  - + p   + n  PSI Supported by Paul Scherrer.

Precision Measurement of Muon Capture on the Proton “  Cap experiment”  - + p   + n  PSI Supported by Paul Scherrer.
Determination of and related results from B A B AR Masahiro Morii, Harvard University on behalf of the B A B AR Collaboration |V cb | MESON 2004, Krakow,

Determination of and related results from B A B AR Masahiro Morii, Harvard University on behalf of the B A B AR Collaboration |V cb | MESON 2004, Krakow,
Muon Capture on the Deuteron Motivation for a new Experiment B e r n h a r d L a u s s U C B e r k e l e y for the MuCAP Collaboration Petersburg Nuclear.

Muon Capture on the Deuteron Motivation for a new Experiment B e r n h a r d L a u s s U C B e r k e l e y for the MuCAP Collaboration Petersburg Nuclear.
1 Peter Kammel for the MuSun Collaboration Muon Capture on the Deuteron The MuSun Experiment BV39, Feb 21, 08.

1 Peter Kammel for the MuSun Collaboration Muon Capture on the Deuteron The MuSun Experiment BV39, Feb 21, 08.
Precision Muon Physics Group muon capture on proton  - + p   + n  to 1 % muon capture on proton  - + p   + n  to 1 % Nucleon form factors, chiral.

Precision Muon Physics Group muon capture on proton  - + p   + n  to 1 % muon capture on proton  - + p   + n  to 1 % Nucleon form factors, chiral.
Precision Measurement of Muon Capture on the Proton “  Cap experiment”  - + p   + n Petersburg Nuclear Physics Institute (PNPI), Gatchina,Russia Paul.

Precision Measurement of Muon Capture on the Proton “  Cap experiment”  - + p   + n Petersburg Nuclear Physics Institute (PNPI), Gatchina,Russia Paul.
New Precision Determination of g p and G F, the MuXperiments at PSI Bernhard Lauss University of Berkeley on behalf of the MuCAP and MuLAN.

New Precision Determination of g p and G F, the MuXperiments at PSI Bernhard Lauss University of Berkeley on behalf of the MuCAP and MuLAN.
Muon Capture as a Probe of the Nucleon’s Axial Structure – the  Cap Experiment Peter Kammel University of Illinois at Urbana-Champaign www.npl.uiuc.edu/exp/mucapture.

Muon Capture as a Probe of the Nucleon’s Axial Structure – the  Cap Experiment Peter Kammel University of Illinois at Urbana-Champaign
Peter Kammel University of Illinois at Urbana-Champaign www.npl.uiuc.edu/exp/mucapture www.npl.uiuc.edu/exp/mucapture MuCap Collaboration V.A. Andreev,

Peter Kammel University of Illinois at Urbana-Champaign MuCap Collaboration V.A. Andreev,
1 Measurement of the Rate of Muon Capture in Hydrogen Gas and Determination of the Proton’s Pseudoscalar Coupling Steven Clayton Dissertation Talk June.

1 Measurement of the Rate of Muon Capture in Hydrogen Gas and Determination of the Proton’s Pseudoscalar Coupling Steven Clayton Dissertation Talk June.
1 Muon Capture by 3 He and The Weak Stucture of the Nucleon Doron Gazit Institute for Nuclear Theory arXiv: 0803.0036.

1 Muon Capture by 3 He and The Weak Stucture of the Nucleon Doron Gazit Institute for Nuclear Theory arXiv:
MuCap High-Precision Measurement of Muon Capture on the Proton BVR35 Progress report presented by Claude Petitjean, PSI 12 Febuary 2004

MuCap High-Precision Measurement of Muon Capture on the Proton BVR35 Progress report presented by Claude Petitjean, PSI 12 Febuary 2004
PRECISION MEASUREMENT OF THE RATE OF MUON CAPTURE IN HYDROGEN GAS AND DETERMINATION IN THE PROTON’S PSEUDOSCALAR COUPLING g P PNPI participants in MuCAP.

PRECISION MEASUREMENT OF THE RATE OF MUON CAPTURE IN HYDROGEN GAS AND DETERMINATION IN THE PROTON’S PSEUDOSCALAR COUPLING g P PNPI participants in MuCAP.
MuCap: From first results to final precision on determining g P Brendan Kiburg 2008 APS April Meeting April 12 th, 2008.

MuCap: From first results to final precision on determining g P Brendan Kiburg 2008 APS April Meeting April 12 th, 2008.
Data Analysis and Present Status of the MuCap Experiment Steven Clayton* University of Illinois *Present address: LANL Outline: 1)Experimental overview.

Data Analysis and Present Status of the MuCap Experiment Steven Clayton* University of Illinois *Present address: LANL Outline: 1)Experimental overview.

Similar presentations

Ads by Google