The Z lineshape challenge: ppm and keV measurements
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The Z lineshape challenge : ppm and keV measurements. / Alcaraz Maestre, Juan; Blondel, Alain; Dam, Mogens; Janot, Patrick.
I: European Physical Journal Plus, Bind 136, Nr. 8, 848, 17.08.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - The Z lineshape challenge
T2 - ppm and keV measurements
AU - Alcaraz Maestre, Juan
AU - Blondel, Alain
AU - Dam, Mogens
AU - Janot, Patrick
PY - 2021/8/17
Y1 - 2021/8/17
N2 - The FCC-ee offers powerful opportunities for direct or indirect evidence for physics beyond the standard model, via a combination of high-precision measurements and searches for forbidden and rare processes and feebly coupled particles. A key element of FCC-ee physics program is the measurement of the Z lineshape from a total of 5 x 10(12) Z bosons and a beam-energy calibration with relative uncertainty of 10(-6). With this exceptionally large event sample, five orders of magnitude larger than that accumulated during the whole LEP1 operation at the Z pole, the defining parameters-m(Z), Gamma(Z), N-nu, sin(2)theta(eff)(W), alpha S(m(Z)(2)), and alpha QED(m(Z)(2))-can be extracted with a leap in accuracy of up to two orders of magnitude with respect to the current state of the art. The ultimate goal that experimental and theory systematic errors match the statistical accuracy (4 keV on the Z mass and width, 3x10(-6) on sin(2)theta(eff)(W), a relative 3x10(-5) on aQED, and less than 0.0001 on aS) leads to highly demanding requirements on collider operation, beam instrumentation, detector design, computing facilities, theoretical calculations, and Monte Carlo event generators. Such precise measurements also call for innovative analysis methods, which require a joint effort and understanding between theorists, experimenters, and accelerator teams.
AB - The FCC-ee offers powerful opportunities for direct or indirect evidence for physics beyond the standard model, via a combination of high-precision measurements and searches for forbidden and rare processes and feebly coupled particles. A key element of FCC-ee physics program is the measurement of the Z lineshape from a total of 5 x 10(12) Z bosons and a beam-energy calibration with relative uncertainty of 10(-6). With this exceptionally large event sample, five orders of magnitude larger than that accumulated during the whole LEP1 operation at the Z pole, the defining parameters-m(Z), Gamma(Z), N-nu, sin(2)theta(eff)(W), alpha S(m(Z)(2)), and alpha QED(m(Z)(2))-can be extracted with a leap in accuracy of up to two orders of magnitude with respect to the current state of the art. The ultimate goal that experimental and theory systematic errors match the statistical accuracy (4 keV on the Z mass and width, 3x10(-6) on sin(2)theta(eff)(W), a relative 3x10(-5) on aQED, and less than 0.0001 on aS) leads to highly demanding requirements on collider operation, beam instrumentation, detector design, computing facilities, theoretical calculations, and Monte Carlo event generators. Such precise measurements also call for innovative analysis methods, which require a joint effort and understanding between theorists, experimenters, and accelerator teams.
KW - FORWARD-BACKWARD ASYMMETRIES
KW - QCD CORRECTIONS
KW - HEAVY-QUARK
U2 - 10.1140/epjp/s13360-021-01760-x
DO - 10.1140/epjp/s13360-021-01760-x
M3 - Journal article
VL - 136
JO - Nuovo Cimento della Societa Italiana di Fisica B
JF - Nuovo Cimento della Societa Italiana di Fisica B
SN - 2190-5444
IS - 8
M1 - 848
ER -
ID: 277226991