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Search for $CP$ violation in D$^0$$\to$ K$^0_\mathrm{S}$K$^0_\mathrm{S}$ decays in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Hayrapetyan, Aram [Yerevan Phys. Inst.]·Tumasyan, Armen [Yerevan Phys. Inst.; Yerevan State U.] (ORCID:0009000006846742)·Adam, Wolfgang [Vienna, OAW] (ORCID:0000000190994341)·Andrejkovic, Janik Walter [Vienna, OAW]·Bergauer, Thomas [Vienna, OAW] (ORCID:0000000257860293)·Chatterjee, Suman [Vienna, OAW] (ORCID:0000000326600349)·Damanakis, Konstantinos [Vienna, OAW] (ORCID:0000000153892872)·Dragicevic, Marko [Vienna, OAW] (ORCID:0000000319676783)·Hussain, Priya Sajid [Vienna, OAW] (ORCID:0000000248255278)·Jeitler, Manfred [Vienna, OAW; TU Vienna; Vienna U.; CERN] (ORCID:0000000251419560)·Krammer, Natascha [Vienna, OAW] (ORCID:0000000205480985)·Li, Ang [Vienna, OAW] (ORCID:000000024547116X)·Liko, Dietrich [Vienna, OAW] (ORCID:000000023380473X)·Mikulec, Ivan [Vienna, OAW] (ORCID:0000000303852746)·Schieck, Jochen [Vienna, OAW; TU Vienna; Vienna U.; CERN] (ORCID:0000000210588093)·Schöfbeck, Robert [Vienna, OAW] (ORCID:0000000223328784)·Schwarz, Dennis [Vienna, OAW] (ORCID:0000000238217331)·Sonawane, Mangesh [Vienna, OAW] (ORCID:0000000305107010)·Templ, Sebastian [Vienna, OAW] (ORCID:0000000331375692)·Waltenberger, Wolfgang [Vienna, OAW] (ORCID:0000000262157228)·Wulz, Claudia-Elisabeth [Vienna, OAW; TU Vienna; Vienna U.; CERN] (ORCID:0000000192265812)·Darwish, Mohamed Rashad [Antwerp U.; Alexandria U.] (ORCID:0000000328942377)·Janssen, Tahys [Antwerp U.] (ORCID:0000000239984081)·Van Laer, Thomas [Antwerp U.]·Van Mechelen, Pierre [Antwerp U.] (ORCID:0000000287319051)·Breugelmans, Nordin [Vrije U., Brussels]·D'Hondt, Jorgen [Vrije U., Brussels] (ORCID:0000000295986241)·Dansana, Soumya [Vrije U., Brussels] (ORCID:0000000277527471)·De Moor, Alexandre [Vrije U., Brussels] (ORCID:0000000159641935)·Delcourt, Martin [Vrije U., Brussels] (ORCID:0000000182061787)·Heyen, Felix [Vrije U., Brussels]·Lowette, Steven [Vrije U., Brussels] (ORCID:0000000339849987)·Makarenko, Inna [Vrije U., Brussels] (ORCID:0000000285534508)·Müller, Denise [Vrije U., Brussels] (ORCID:0000000217524527)·Tavernier, Stefaan [Vrije U., Brussels] (ORCID:0000000267929522)·Tytgat, Michael [Vrije U., Brussels; Gent U.] (ORCID:0000000239902074)·Van Onsem, Gerrit Patrick [Vrije U., Brussels] (ORCID:0000000216642337)·Van Putte, Senne [Vrije U., Brussels] (ORCID:0000000315593606)·Vannerom, David [Vrije U., Brussels] (ORCID:0000000227475095)·Bilin, Bugra [Brussels U.; INFN, Rome] (ORCID:0000000314397128)·Clerbaux, Barbara [Brussels U.; INFN, Rome] (ORCID:0000000185478211)·Das, Aloke Kumar [Brussels U.; INFN, Rome]·De Lentdecker, Gilles [Brussels U.; INFN, Rome] (ORCID:0000000151247693)·Evard, Hugues [Brussels U.; INFN, Rome] (ORCID:0009000550391462)·Favart, Laurent [Brussels U.; INFN, Rome] (ORCID:0000000316457454)·Gianneios, Paraskevas [Brussels U.; INFN, Rome] (ORCID:0009000372330738)·Jaramillo, Johny [Brussels U.; INFN, Rome] (ORCID:0000000338856608)·Khalilzadeh, Ali [Brussels U.; INFN, Rome]·Khan, Fakhri Alam [Brussels U.; INFN, Rome] (ORCID:000900022039277X)·Lee, Kyeongpil [Brussels U.; INFN, Rome] (ORCID:0000000308084184)·Mahdavikhorrami, Mostafa [Brussels U.; INFN, Rome] (ORCID:0000000282653595)·Malara, Andrea [Brussels U.; INFN, Rome] (ORCID:0000000186459282)·Paredes, Santiago [Brussels U.; INFN, Rome] (ORCID:0000000184879603)·Shahzad, Muhammad Aamir [Brussels U.; INFN, Rome]·Thomas, Laurent [Brussels U.; INFN, Rome] (ORCID:0000000227563853)·Vanden Bemden, Max [Brussels U.; INFN, Rome] (ORCID:0009000077257945)·Vander Velde, Catherine [Brussels U.; INFN, Rome] (ORCID:0000000333927294)·Vanlaer, Pascal [Brussels U.; INFN, Rome] (ORCID:0000000279314496)·De Coen, Maarten [Gent U.] (ORCID:0000000258547442)·Dobur, Didar [Gent U.] (ORCID:0000000300124866)·Gokbulut, Gul [Gent U.] (ORCID:0000000201756454)·Hong, Yanwen [Gent U.] (ORCID:0000000347522458)·Knolle, Joscha [Gent U.] (ORCID:0000000247815704)·Lambrecht, Luka [Gent U.] (ORCID:0000000191081560)·Marckx, David [Gent U.] (ORCID:0000000167522290)·Mota Amarilo, Kevin [Gent U.] (ORCID:0000000317073348)·Samalan, Amrutha [Gent U.]·Skovpen, Kirill [Gent U.] (ORCID:0000000211600621)·Van Den Bossche, Niels [Gent U.] (ORCID:0000000329734991)·van der Linden, Jan [Gent U.] (ORCID:000000027174781X)·Wezenbeek, Liam [Gent U.] (ORCID:000000016952891X)·Benecke, Anna [Louvain U.; Louvain U., CP3] (ORCID:0000000302523609)·Bethani, Agni [Louvain U.; Louvain U., CP3] (ORCID:0000000281507043)·Bruno, Giacomo [Louvain U.; Louvain U., CP3] (ORCID:0000000188578197)·Caputo, Claudio [Louvain U.; Louvain U., CP3] (ORCID:0000000175224808)·De Favereau De Jeneret, Jerome [Louvain U.; Louvain U., CP3] (ORCID:0000000317758574)·Delaere, Christophe [Louvain U.; Louvain U., CP3] (ORCID:0000000187076021)·Donertas, Izzeddin Suat [Louvain U.; Louvain U., CP3] (ORCID:000000017485412X)·Giammanco, Andrea [Louvain U.; Louvain U., CP3] (ORCID:0000000196408294)·Guzel, Ahmet Oguz [Louvain U.; Louvain U., CP3] (ORCID:0000000294045933)·Jain, Sa. [Louvain U., CP3] (ORCID:0000000150783689)·Jain, Sandhya [Louvain U.] (ORCID:0000000150783689)·Lemaitre, Vincent [Louvain U.; Louvain U., CP3]·Lidrych, Jindrich [Louvain U.; Louvain U., CP3] (ORCID:0000000314390196)·Mastrapasqua, Paola [Louvain U.; Louvain U., CP3] (ORCID:0000000220432367)·Tran, Tu Thong [Louvain U.; Louvain U., CP3] (ORCID:000000033060350X)·Wertz, Sébastien [Louvain U.; Louvain U., CP3] (ORCID:0000000286453670)·Alves, Gilvan [Rio de Janeiro, CBPF] (ORCID:0000000283691446)·Alves Gallo Pereira, Miguel [Rio de Janeiro, CBPF] (ORCID:0000000342967028)·Coelho, Eduardo [Rio de Janeiro, CBPF] (ORCID:0000000161149907)·Correia Silva, Gilson [Rio de Janeiro, CBPF] (ORCID:0000000162323591)·Hensel, Carsten [Rio de Janeiro, CBPF] (ORCID:0000000188747624)·Menezes De Oliveira, Thales [Rio de Janeiro, CBPF] (ORCID:0009000947298354)·Mora Herrera, Clemencia [Rio de Janeiro, CBPF; Rio de Janeiro State U.] (ORCID:0000000339153170)·Moraes, Arthur [Rio de Janeiro, CBPF] (ORCID:0000000251575686)·Rebello Teles, Patricia [Rio de Janeiro, CBPF] (ORCID:0000000190298506)·Soeiro, Mariana [Rio de Janeiro, CBPF]·Vilela Pereira, Antonio [Rio de Janeiro, CBPF; Rio de Janeiro State U.] (ORCID:0000000331774626)·Aldá Júnior, Walter Luiz [Rio de Janeiro State U.] (ORCID:0000000158559817)·Barroso Ferreira Filho, Mapse [Rio de Janeiro State U.] (ORCID:0000000339040571)
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Abstract

A search is reported for charge-parity $CP$ violation in D$^0$$\to$ K$^0_\mathrm{S}$K$^0_\mathrm{S}$ decays, using data collected in proton-proton collisions at $\sqrt{s}$ = 13 TeV recorded by the CMS experiment in 2018. The analysis uses a dedicated data set that corresponds to an integrated luminosity of 41.6 fb$^{-1}$, which consists of about 10 billion events containing a pair of b hadrons, nearly all of which decay to charm hadrons. The flavor of the neutral D meson is determined by the pion charge in the reconstructed decays D$^{*+}$$\to$ D$^0\pi^+$ and D$^{*-}$$\to$ D$^0\pi^-$. The $CP$ asymmetry in D$^0$$\to$ K$^0_\mathrm{S}$K$^0_\mathrm{S}$ is measured to be $A_{CP}$(K$^0_\mathrm{S}$K$^0_\mathrm{S}$) = (6.2 $\pm$ 3.0 $\pm$ 0.2 $\pm$ 0.8)%, where the three uncertainties represent the statistical uncertainty, the systematic uncertainty, and the uncertainty in the measurement of the $CP$ asymmetry in the D$^0$ $\to$ K$^0_\mathrm{S}\pi^+\pi^-$ decay. This is the first $CP$ asymmetry measurement by CMS in the charm sector as well as the first to utilize a fully hadronic final state.

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BibTeXRIS

Hayrapetyan, Aram [Yerevan Phys. Inst.], Tumasyan, Armen [Yerevan Phys. Inst.; Yerevan State U.] (ORCID:0009000006846742), Adam, Wolfgang [Vienna, OAW] (ORCID:0000000190994341), Andrejkovic, Janik Walter [Vienna, OAW], Bergauer, Thomas [Vienna, OAW] (ORCID:0000000257860293), Chatterjee, Suman [Vienna, OAW] (ORCID:0000000326600349), Damanakis, Konstantinos [Vienna, OAW] (ORCID:0000000153892872), Dragicevic, Marko [Vienna, OAW] (ORCID:0000000319676783), Hussain, Priya Sajid [Vienna, OAW] (ORCID:0000000248255278), Jeitler, Manfred [Vienna, OAW; TU Vienna; Vienna U.; CERN] (ORCID:0000000251419560), Krammer, Natascha [Vienna, OAW] (ORCID:0000000205480985), Li, Ang [Vienna, OAW] (ORCID:000000024547116X), Liko, Dietrich [Vienna, OAW] (ORCID:000000023380473X), Mikulec, Ivan [Vienna, OAW] (ORCID:0000000303852746), Schieck, Jochen [Vienna, OAW; TU Vienna; Vienna U.; CERN] (ORCID:0000000210588093), Schöfbeck, Robert [Vienna, OAW] (ORCID:0000000223328784), Schwarz, Dennis [Vienna, OAW] (ORCID:0000000238217331), Sonawane, Mangesh [Vienna, OAW] (ORCID:0000000305107010), Templ, Sebastian [Vienna, OAW] (ORCID:0000000331375692), Waltenberger, Wolfgang [Vienna, OAW] (ORCID:0000000262157228), Wulz, Claudia-Elisabeth [Vienna, OAW; TU Vienna; Vienna U.; CERN] (ORCID:0000000192265812), Darwish, Mohamed Rashad [Antwerp U.; Alexandria U.] (ORCID:0000000328942377), Janssen, Tahys [Antwerp U.] (ORCID:0000000239984081), Van Laer, Thomas [Antwerp U.], Van Mechelen, Pierre [Antwerp U.] (ORCID:0000000287319051), Breugelmans, Nordin [Vrije U., Brussels], D'Hondt, Jorgen [Vrije U., Brussels] (ORCID:0000000295986241), Dansana, Soumya [Vrije U., Brussels] (ORCID:0000000277527471), De Moor, Alexandre [Vrije U., Brussels] (ORCID:0000000159641935), Delcourt, Martin [Vrije U., Brussels] (ORCID:0000000182061787), Heyen, Felix [Vrije U., Brussels], Lowette, Steven [Vrije U., Brussels] (ORCID:0000000339849987), Makarenko, Inna [Vrije U., Brussels] (ORCID:0000000285534508), Müller, Denise [Vrije U., Brussels] (ORCID:0000000217524527), Tavernier, Stefaan [Vrije U., Brussels] (ORCID:0000000267929522), Tytgat, Michael [Vrije U., Brussels; Gent U.] (ORCID:0000000239902074), Van Onsem, Gerrit Patrick [Vrije U., Brussels] (ORCID:0000000216642337), Van Putte, Senne [Vrije U., Brussels] (ORCID:0000000315593606), Vannerom, David [Vrije U., Brussels] (ORCID:0000000227475095), Bilin, Bugra [Brussels U.; INFN, Rome] (ORCID:0000000314397128), Clerbaux, Barbara [Brussels U.; INFN, Rome] (ORCID:0000000185478211), Das, Aloke Kumar [Brussels U.; INFN, Rome], De Lentdecker, Gilles [Brussels U.; INFN, Rome] (ORCID:0000000151247693), Evard, Hugues [Brussels U.; INFN, Rome] (ORCID:0009000550391462), Favart, Laurent [Brussels U.; INFN, Rome] (ORCID:0000000316457454), Gianneios, Paraskevas [Brussels U.; INFN, Rome] (ORCID:0009000372330738), Jaramillo, Johny [Brussels U.; INFN, Rome] (ORCID:0000000338856608), Khalilzadeh, Ali [Brussels U.; INFN, Rome], Khan, Fakhri Alam [Brussels U.; INFN, Rome] (ORCID:000900022039277X), Lee, Kyeongpil [Brussels U.; INFN, Rome] (ORCID:0000000308084184), Mahdavikhorrami, Mostafa [Brussels U.; INFN, Rome] (ORCID:0000000282653595), Malara, Andrea [Brussels U.; INFN, Rome] (ORCID:0000000186459282), Paredes, Santiago [Brussels U.; INFN, Rome] (ORCID:0000000184879603), Shahzad, Muhammad Aamir [Brussels U.; INFN, Rome], Thomas, Laurent [Brussels U.; INFN, Rome] (ORCID:0000000227563853), Vanden Bemden, Max [Brussels U.; INFN, Rome] (ORCID:0009000077257945), Vander Velde, Catherine [Brussels U.; INFN, Rome] (ORCID:0000000333927294), Vanlaer, Pascal [Brussels U.; INFN, Rome] (ORCID:0000000279314496), De Coen, Maarten [Gent U.] (ORCID:0000000258547442), Dobur, Didar [Gent U.] (ORCID:0000000300124866), Gokbulut, Gul [Gent U.] (ORCID:0000000201756454), Hong, Yanwen [Gent U.] (ORCID:0000000347522458), Knolle, Joscha [Gent U.] (ORCID:0000000247815704), Lambrecht, Luka [Gent U.] (ORCID:0000000191081560), Marckx, David [Gent U.] (ORCID:0000000167522290), Mota Amarilo, Kevin [Gent U.] (ORCID:0000000317073348), Samalan, Amrutha [Gent U.], Skovpen, Kirill [Gent U.] (ORCID:0000000211600621), Van Den Bossche, Niels [Gent U.] (ORCID:0000000329734991), van der Linden, Jan [Gent U.] (ORCID:000000027174781X), Wezenbeek, Liam [Gent U.] (ORCID:000000016952891X), Benecke, Anna [Louvain U.; Louvain U., CP3] (ORCID:0000000302523609), Bethani, Agni [Louvain U.; Louvain U., CP3] (ORCID:0000000281507043), Bruno, Giacomo [Louvain U.; Louvain U., CP3] (ORCID:0000000188578197), Caputo, Claudio [Louvain U.; Louvain U., CP3] (ORCID:0000000175224808), De Favereau De Jeneret, Jerome [Louvain U.; Louvain U., CP3] (ORCID:0000000317758574), Delaere, Christophe [Louvain U.; Louvain U., CP3] (ORCID:0000000187076021), Donertas, Izzeddin Suat [Louvain U.; Louvain U., CP3] (ORCID:000000017485412X), Giammanco, Andrea [Louvain U.; Louvain U., CP3] (ORCID:0000000196408294), Guzel, Ahmet Oguz [Louvain U.; Louvain U., CP3] (ORCID:0000000294045933), Jain, Sa. [Louvain U., CP3] (ORCID:0000000150783689), Jain, Sandhya [Louvain U.] (ORCID:0000000150783689), Lemaitre, Vincent [Louvain U.; Louvain U., CP3], Lidrych, Jindrich [Louvain U.; Louvain U., CP3] (ORCID:0000000314390196), Mastrapasqua, Paola [Louvain U.; Louvain U., CP3] (ORCID:0000000220432367), Tran, Tu Thong [Louvain U.; Louvain U., CP3] (ORCID:000000033060350X), Wertz, Sébastien [Louvain U.; Louvain U., CP3] (ORCID:0000000286453670), Alves, Gilvan [Rio de Janeiro, CBPF] (ORCID:0000000283691446), Alves Gallo Pereira, Miguel [Rio de Janeiro, CBPF] (ORCID:0000000342967028), Coelho, Eduardo [Rio de Janeiro, CBPF] (ORCID:0000000161149907), Correia Silva, Gilson [Rio de Janeiro, CBPF] (ORCID:0000000162323591), Hensel, Carsten [Rio de Janeiro, CBPF] (ORCID:0000000188747624), Menezes De Oliveira, Thales [Rio de Janeiro, CBPF] (ORCID:0009000947298354), Mora Herrera, Clemencia [Rio de Janeiro, CBPF; Rio de Janeiro State U.] (ORCID:0000000339153170), Moraes, Arthur [Rio de Janeiro, CBPF] (ORCID:0000000251575686), Rebello Teles, Patricia [Rio de Janeiro, CBPF] (ORCID:0000000190298506), Soeiro, Mariana [Rio de Janeiro, CBPF], Vilela Pereira, Antonio [Rio de Janeiro, CBPF; Rio de Janeiro State U.] (ORCID:0000000331774626), Aldá Júnior, Walter Luiz [Rio de Janeiro State U.] (ORCID:0000000158559817), Barroso Ferreira Filho, Mapse [Rio de Janeiro State U.] (ORCID:0000000339040571). 2024-12-06. Search for $CP$ violation in D$^0$$\to$ K$^0_\mathrm{S}$K$^0_\mathrm{S}$ decays in proton-proton collisions at $\sqrt{s}$ = 13 TeV. https://doi.org/10.1140/epjc%2Fs10052-024-13244-0

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