## Beam-spread determination for luminosity measurement at CEPC

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Any asymmetry in energy of the colliding beams will lead to a longitudinal boost of the center-of-mass frame of colliding particles w.r.t. the laboratory frame and consequently to the counting loss in luminometer due to the loss of colinearity of Bhabha final states. At CEPC running at the Z0 pole, asymmetry in energy of the colliding beams should be known as well as 12.5% of the beam-spread, in order to control the uncertainty of Bhabha count at the level of 10-4. Here we discuss the method, initially proposed for FCCee, to determine variation of the beam-spread from the measurement of the effective center-of-mass energy in e+e-→μ+μ- collisions.

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Proceedings of the International Workshop on Future Linear Colliders, LCWS 2019, 2020##### Note:

- Talk presented at the International Workshop on Future Linear Colliders (LCWS2019), Sendai, Japan, 28 October-1 November, 2019. C19-10-28

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VinčaTY - CONF AU - Smiljanić, Ivan AU - Božović-Jelisavčić, Ivanka AU - Kačarević, Goran PY - 2020 UR - https://vinar.vin.bg.ac.rs/handle/123456789/9045 UR - https://arxiv.org/abs/2002.03661 AB - Any asymmetry in energy of the colliding beams will lead to a longitudinal boost of the center-of-mass frame of colliding particles w.r.t. the laboratory frame and consequently to the counting loss in luminometer due to the loss of colinearity of Bhabha final states. At CEPC running at the Z0 pole, asymmetry in energy of the colliding beams should be known as well as 12.5% of the beam-spread, in order to control the uncertainty of Bhabha count at the level of 10-4. Here we discuss the method, initially proposed for FCCee, to determine variation of the beam-spread from the measurement of the effective center-of-mass energy in e+e-→μ+μ- collisions. C3 - Proceedings of the International Workshop on Future Linear Colliders, LCWS 2019 C3 - Proceedings of the International Workshop on Future Linear Colliders, LCWS 2019 T1 - Beam-spread determination for luminosity measurement at CEPC ER -

@conference{ author = "Smiljanić, Ivan and Božović-Jelisavčić, Ivanka and Kačarević, Goran", year = "2020", url = "https://vinar.vin.bg.ac.rs/handle/123456789/9045, https://arxiv.org/abs/2002.03661", abstract = "Any asymmetry in energy of the colliding beams will lead to a longitudinal boost of the center-of-mass frame of colliding particles w.r.t. the laboratory frame and consequently to the counting loss in luminometer due to the loss of colinearity of Bhabha final states. At CEPC running at the Z0 pole, asymmetry in energy of the colliding beams should be known as well as 12.5% of the beam-spread, in order to control the uncertainty of Bhabha count at the level of 10-4. Here we discuss the method, initially proposed for FCCee, to determine variation of the beam-spread from the measurement of the effective center-of-mass energy in e+e-→μ+μ- collisions.", journal = "Proceedings of the International Workshop on Future Linear Colliders, LCWS 2019, Proceedings of the International Workshop on Future Linear Colliders, LCWS 2019", title = "Beam-spread determination for luminosity measurement at CEPC" }

Smiljanić, I., Božović-Jelisavčić, I.,& Kačarević, G. (2020). Beam-spread determination for luminosity measurement at CEPC. Proceedings of the International Workshop on Future Linear Colliders, LCWS 2019.

Smiljanić I, Božović-Jelisavčić I, Kačarević G. Beam-spread determination for luminosity measurement at CEPC. Proceedings of the International Workshop on Future Linear Colliders, LCWS 2019. 2020;

Smiljanić Ivan, Božović-Jelisavčić Ivanka, Kačarević Goran, "Beam-spread determination for luminosity measurement at CEPC" Proceedings of the International Workshop on Future Linear Colliders, LCWS 2019 (2020)

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