Publikationsdatum:
2021-03-01
Beschreibung:
The time-dependent CP asymmetries of B0→ π+π− and $$ {B}_s^0 $$ B s 0 → K+K− decays are measured using a data sample of pp collisions corresponding to an integrated luminosity of 1.9 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are$$ {displaystyle egin{array}{c}{C}_{pi pi}=-0.311pm 0.045pm 0.015, {}{S}_{pi pi}=-0.706pm 0.042pm 0.013, {}{C}_{KK}=0.123pm 0.034pm 0.015, {}{S}_{KK}=0.164pm 0.034pm 0.014, {}{mathcal{A}}_{KK}^{Delta varGamma }=-0.83pm 0.05pm 0.09,end{array}} $$ C ππ = − 0.311 ± 0.045 ± 0.015 , S ππ = − 0.706 ± 0.042 ± 0.013 , C KK = 0.123 ± 0.034 ± 0.015 , S KK = 0.164 ± 0.034 ± 0.014 , A KK Δ Γ = − 0.83 ± 0.05 ± 0.09 , where the first uncertainties are statistical and the second systematic. The same data sample is used to measure the time-integrated CP asymmetries of B0→ K + π− and $$ {B}_s^0 $$ B s 0 →K−π+ decays and the results are$$ {displaystyle egin{array}{c}{A}_{CP}^{B^0}=-0.0824pm 0.0033pm 0.0033, {}{A}_{CP}^{B_s^0}=0.236pm 0.013pm 0.011.end{array}} $$ A CP B 0 = − 0.0824 ± 0.0033 ± 0.0033 , A CP B s 0 = 0.236 ± 0.013 ± 0.011 . All results are consistent with earlier measurements. A combination of LHCb measurements provides the first observation of time-dependent CP violation in $$ {B}_s^0 $$ B s 0 decays.
Print ISSN:
1126-6708
Digitale ISSN:
1029-8479
Thema:
Physik
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