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Volumn 52, Issue 9, 1995, Pages 4784-4827

Measurement of the W boson mass

(413)  Abe, F m   Albrow, M G g   Amendolia, S R w   Amidei, D p   Antos, J ab   Anway Wiese, C d   Apollinari, G z   Areti, H g   Atac, M g   Auchincloss, P y   Azfar, F u   Azzi, P t   Bacchetta, N t   Badgett, W p   Bailey, M W r   Bao, J ai   De Barbaro, P D y   Barbaro Galtieri, A n   Barnes, V E x   Barnet, B A l   more..


Author keywords

[No Author keywords available]

Indexed keywords


EID: 30244541588     PISSN: 05562821     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevD.52.4784     Document Type: Article
Times cited : (155)

References (114)
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    • This is a superset of the 19.3 pb-1 used in some other CDF analyses (for example, citetop_prd), which exclude 0.4 pb-1 of data in which some (small) part of the muon system was inoperative.
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    • The magnetic field map has been corrected upwards by a factor of 1.00070 pm0.00021 from the original mapping, where this factor is from the recent NMR measurement.
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    • See citemrdprd1 above. The forward backward charge asymmetry in W decays is defined as A(η) = (dσsup +/dη) - (dσ-/dη) over (dσsup +/dη) + (dσ-/dη), where dσsup pm/dη is the cross section for Wsup pm decays as a function of lepton pseudorapidity, η.
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    • we have updated the numbers in the text to the 1994 values where appropriate. The differences for the numbers used in this paper are completely insignificant.
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    • The momentum scale determination in Sec. III is truly a transverse momentum scale determination. The determination of the electron energy scale from E/p in Sec. V is actually a determination of the transverse energy scale using ET/pT.
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    • The data in Fig. reffig6(a) are fit to a parabola, y=ax2+bx+c, yielding a=(2.31 pm0.17), b=(0.23 pm0.11), and c=(-2.29 pm0.08). A similar fit to Fig. reffig6(b) yields a=(0.22 pm0.17), b=(0.28 pm0.11), and c=(-2.38 pm0.08).
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    • The data in Fig. reffig7(b) are fit to a line, y=ax+b, yielding a=(-2.4 pm1.5) times10-5 and b=(-2.20 pm0.09).
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    • Electron candidates in the plug and forward regions are not required to have a track, but must have ET>5 GeV, pass an ``isolation requirement'' that the energy measured in a cone (Δφ)2+(Δη)20.4 be less than 10 and have an electromagnetic fraction greater than 95 the plug calorimeter must also pass a transverse profile chi2 test.
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    • Note that this method is only used as a check since it is not as robust as the extraction from the Z→ ee width. The method assumes the same transverse energy for all electrons. Also, systematic effects may cancel in the ratio, E/p, resulting in an extracted constant term which is erroneously low.
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    • Uncertainties are extracted from the shifts listed in the tables in this and other sections. Linear fits to the mass shifts relative to the nominal value of the parameter being studied yield a slope as the parameter is increased or decreased. The uncertainty on the parameter being studied is multiplied by the slope to yield an uncertainty on the scale, mass, width or other quantity. If the uncertainty is asymmetric, the uncertainty is symmetrized by taking the larger one.
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    • Note that electron shower leakage, bremsstrahlung landing outside the electron cluster, and overlap with hadronic particles only need to be directly addressed in the recoil reconstruction and not in the electron energy measurement. It is the nature of the electron energy scale determination from E/p to include these effects in the definition of the energy scale for electrons. This is the reason the W→ eν data are used to set the energy scale.
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    • The reader may be concerned that the < u|> and < MTW> shifts are not in accord with Eq. ( refapprox). That relation holds only on average for the bulk sample. For smaller subsets chosen with kinematic biases, such as the few rejected W events being considered, it need not hold.
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    • The W mass prediction is from M. Swartz (private communication).
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    • The theory curves are calculated using a fortran program from F. Halzen and B.A. Kniehl (private communication), described in
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    • The MW Mtop relation is calculated in the modified resummation scheme, and includes the O(α), O (ααs), and O(α2) contributions to Δ r. The program has been modified to include the effect of higher order Mtop dependent QCD corrections to Δ ρ see, e.g.
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    • and also A. Sirlin, Institute Report No. HEP PH 9403282 (unpublished). The values used to calculate the curves are αEM = 1/(137.0359895 pm 0.0000061), GF = 1.16639 pm 0.00002 ×10-5 GeV-2, MZ = 91.187 pm 0.007 GeV/c2, αs(MZsup 2) = 0.117 pm 0.005, and Δ αhad(MZsup 2) = 0.02666 pm 0.00075 (see citealphas below). For additional discussions, see, e.g.
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    • and references therein.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.